Publications (121)
Magnetar-like activity from the central compact object in the SNR RCW103
Nanda Rea, Alice Borghese, Paolo Esposito +4
The 6.67 hr periodicity and the variable X-ray flux of the central compact object (CCO) at the center of the SNR RCW 103, named 1E 161348-5055, have been always difficult to interp…
Spectral features in isolated neutron stars induced by inhomogeneous surface temperatures
Daniele Viganò, Rosalba Perna, Nanda Rea +1
The thermal X-ray spectra of several isolated neutron stars display deviations from a pure blackbody. The accurate physical interpretation of these spectral features bears profound…
Simultaneous X-ray and Radio Observations of Rotating Radio Transient J1819-1458
Joshua Miller, Maura McLaughlin, Nanda Rea +4
We present the results of simultaneous radio and X-ray observations of PSR J1819-1458. Our 94-ks XMM-Newton observation of the high magnetic field 5*10^13 G pulsar reveals a blackb…
Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares
Jian Li, Diego F. Torres, Shu Zhang +6
We report on the full analysis of a Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring of the γ-ray binary system LS I +61 303. The data set covers 42…
On the rate of crustal failures in young magnetars
Clara Dehman, Daniele Viganò, Nanda Rea +3
The activity of magnetars is powered by their intense and dynamic magnetic fields and has been proposed as the trigger to extragalactic Fast Radio Bursts. Here we estimate the freq…
Science objectives of the Einstein Probe mission
Weimin Yuan, Lixin Dai, Hua Feng +93
The Einstein Probe (EP) is an interdisciplinary mission of time-domain and X-ray astronomy. Equipped with a wide-field lobster-eye X-ray focusing imager, EP will discover cosmic X-…
Impact of the orbital uncertainties on the timing of pulsars in binary systems
G. Andrea Caliandro, Diego F. Torres, Nanda Rea
The detection of pulsations from an X-ray binary is an unambiguous signature of the presence of a neutron star in the system. When the pulsations are missed in the radio band, thei…
Systematic study of magnetar outbursts
Francesco Coti Zelati, Nanda Rea, Jose Pons +2
We present the results of the systematic study of all magnetar outbursts observed to date, through a reanalysis of data acquired in about 1100 X-ray observations. We track the temp…
Timing and spectral changes of the Be X-ray transient EXO 0531-6609.2 through high and low state
Nanda Rea, Gian Luca Israel, Tiziana Di Salvo +2
We report on spectral and timing analysis of BeppoSAX data of the 13.6 s period transient X-ray pulsar EXO 0531-6609.2. Observations were carried out in March 1997 and October 1998…
Physics and astrophysics of strong magnetic field systems with eXTP
Andrea Santangelo, Silvia Zane, Hua Feng +38
In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies of strongly magnetized objects. We will focus on the physics…
Long-term study of the 2020 magnetar-like outburst of the young pulsar PSRJ1846-0258 in Kes 75
Rajath Sathyaprakash, Nanda Rea, Francesco Coti Zelati +14
Magnetar-like activity has been observed in a large variety of neutron stars. PSR J1846-0258 is a young 327 ms radio-quiet pulsar with a large rotational power ($\sim 8 \times 10^{…
Constraining the GRB-magnetar model by means of the Galactic pulsar population
Nanda Rea, Miguel Gullon, Jose' A. Pons +4
A large fraction of Gamma Ray Bursts (GRBs) displays an X-ray plateau phase within <10^{5} s from the prompt emission, proposed to be powered by the spin-down energy of a rapidly s…
Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4-650224
Francesco Coti Zelati, Alessandro Papitto, Domitilla de Martino +12
We report on a multi-wavelength study of the unclassified X-ray source CXOU J110926.4-650224 (J1109). We identified the optical counterpart as a blue star with a magnitude of $\sim…
The 11 years of low-activity of the magnetar XTE J1810-197
Fabio Pintore, Sandro Mereghetti, Paolo Esposito +5
In 2003, the magnetar XTE J1810-197 started an outburst that lasted until early 2007. In the following 11 years, the source stayed in a quiescent/low activity phase. XTE J1810-197…
The imprint of the crustal magnetic field on the thermal spectra and pulse profiles of isolated neutron stars
Rosalba Perna, Daniele Vigano', Jose' A. Pons +1
Isolated neutron stars (NSs) show a bewildering variety of astrophysical manifestations, presumably shaped by the magnetic field strength and topology at birth. Here, using state-o…
INTEGRAL observations of the gamma-ray binary 1FGL J1018.6-5856
Jian Li, Diego F. Torres, Yupeng Chen +5
The Fermi-LAT collaboration has recently reported that one of their detected sources, namely, 1FGL J1018.6-5856, is a new gamma-ray binary similar to LS 5039. This has prompted eff…
A sample of ionised Fe line-emitting X-ray sources in the inner Galactic disc
Samaresh Mondal, Gabriele Ponti, Tong Bao +4
Previous studies suggest that the Galactic diffuse X-ray emission is composed of unresolved point sources, primarily mCVs. However, nearby mCVs have a much lower 6.7 keV line equiv…
ASKAP J144834-685644: a newly discovered long period radio transient detected from radio to X-rays
Akash Anumarlapudi, David L. Kaplan, Nanda Rea +13
Long-period radio transients (LPTs) are an emerging group of radio transients that show periodic polarized radio bursts with periods varying from a few minutes to a few hours. Fewe…
Multi-wavelength observations of the transitional millisecond pulsar binary XSSJ12270-4859
Domitilla de Martino, Alessandro Papitto, Tomaso Belloni +7
We present an analysis of X-ray, Ultraviolet and optical/near-IR photometric data of the transitional millisecond pulsar binary XSSJ12270-4859, obtained at different epochs after t…
A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary
Diego F. Torres, Nanda Rea, Paolo Esposito +3
We report on the Swift-BAT detection of a short burst from the direction of the TeV binary LS I +61 303, resembling those generally labelled as magnetar-like. We show that it is li…
XMM-Newton and NuSTAR discovery of a likely IP candidate XMMU J173029.8-330920 in the Galactic Disk
Samaresh Mondal, Gabriele Ponti, Luke Filor +7
We aim at characterizing the population of low-luminosity X-ray sources in the Galactic plane by studying their X-ray spectra and periodic signals in the light curves. We are perfo…
Probing neutron star interiors and the properties of cold ultra-dense matter with the SKAO
Avishek Basu, Vanessa Graber, Marcus E. Lower +19
Matter inside neutron stars is compressed to densities several times greater than nuclear saturation density, while maintaining low temperatures and large asymmetries between neutr…
The NewAthena mission concept in the context of the next decade of X-ray astronomy
Mike Cruise, Matteo Guainazzi, James Aird +16
Large X-ray observatories such as Chandra and XMM-Newton have been delivering scientific breakthroughs in research fields as diverse as our Solar System, the astrophysics of stars,…
Resonant cyclotron scattering in magnetars' emission
Nanda Rea, Silvia Zane, Roberto Turolla +2
(Abridged) We present a systematic fit of a model of resonant cyclotron scattering (RCS) to the X-ray data of ten magnetars, including canonical and transient anomalous X-ray pulsa…
Discovery of Rapid X-ray Oscillations in the Tail of the SGR 1806-20 Hyperflare
GianLuca Israel, Tomaso Belloni, Luigi Stella +7
We have discovered rapid Quasi Periodic Oscillations (QPOs) in RXTE/PCA measurements of the pulsating tail of the 27th December 2004 giant flare of SGR 1806-20. QPOs at about 92.5H…
Discovery and Monitoring of the likely IR Counterpart of SGR 1806-20 during the 2004 gamma-ray burst-active state
GianLuca Israel, Stefano Covino, Roberto Mignani +9
The sky region including the Chandra position of SGR 1806-20 was monitored in the IR band during 2004, following its increased high energy bursting activity. Observations were perf…
Evidence of a cyclotron feature in the spectrum of the anomalous X-ray pulsar 1RXS J170849-400910
Nanda Rea, Gian Luca Israel, Luigi Stella +5
We report the results of a long observation of the anomalous X-ray pulsar 1RXS J170849-400910 obtained with the BeppoSAX satellite in August 2001. The best-fit phase-averaged spect…
Constraints on the dense matter equation of state from young and cold isolated neutron stars
Alessio Marino, Clara Dehman, Konstantinos Kovlakas +3
Neutron stars are the dense and highly magnetic relics of supernova explosions of massive stars. The quest to constrain the Equation of State (EoS) of ultra-dense matter and thereb…
Search for gamma-ray emission from AE Aquarii with seven years of FERMI-LAT observations
Jian Li, Diego F. Torres, Nanda Rea +4
AE Aquarii (AE Aqr) is a cataclysmic binary hosting one of the fastest rotating (P = 33.08 s) white dwarfs known. Based on seven years of Fermi Large Area Telescope (L…
Dense Matter in Neutron Stars with eXTP
Ang Li, Anna L. Watts, Guobao Zhang +82
In this White Paper, we present the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission to constrain the equation of state of dense matter in neutron stars, explo…
The first 7 months of the 2020 X-ray outburst of the magnetar SGR J1935+2154
Alice Borghese, Francesco Coti Zelati, Gian Luca Israel +10
The magnetar SGR J1935+2154 underwent a new active episode on 2020 April 27-28, when a forest of hundreds of X-ray bursts and a large enhancement of the persistent flux were detect…
The first outburst of the new magnetar candidate SGR 0501+4516
Nanda Rea, GianLuca Israel, Roberto Turolla +17
We report here on the outburst onset and evolution of the new Soft Gamma Repeater SGR 0501+4516. We monitored the new SGR with XMM-Newton starting on 2008 August 23, one day after…
Long-term monitoring of LS I+61303 with INTEGRAL
Shu Zhang, Diego F. Torres, Jian Li +3
LS I+61303 is one of the few high-mass X-ray binaries that have been recently observed at TeV and GeV energies. Here we investigate the hard X-ray spectral and timing properties of…
A variable absorption feature in the X-ray spectrum of a magnetar
Andrea Tiengo, Paolo Esposito, Sandro Mereghetti +9
Soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are slowly rotating, isolated neutron stars that sporadically undergo episodes of long-term flux enhancement (out…
A Radio-loud Magnetar in X-ray Quiescence
Lina Levin, Matthew Bailes, Samuel Bates +12
As part of a survey for radio pulsars with the Parkes 64-m telescope we have discovered PSR J1622-4950, a pulsar with a 4.3-s rotation period. Follow-up observations show that the…
Gamma-ray upper limits on magnetars with 6 years of Fermi-LAT observations
Jian Li, Nanda Rea, Diego F. Torres +1
We report on the search for gamma-ray emission from 20 magnetars using 6 years of Fermi, Large Area Telescope (LAT) observations. No significant evidence for gamma-ray emission fro…
A puzzling event during the X-ray emission of the binary system GX 1+4
Nanda Rea, Luigi Stella, Gian Luca Israel +4
We report on a long X-ray observation of the slow-rotating binary pulsar GX 1+4. BeppoSAX observed, in the 0.1-200 keV energy range, an event in which the source flux dropped for a…
Modelling of the Surface Emission of the Low-Magnetic Field Magnetar SGR 0418+5729
Sebastien Guillot, Rosalba Perna, Nanda Rea +2
We perform a detailed modelling of the post-outburst surface emission of the low magnetic field magnetar SGR 0418+5729. The dipolar magnetic field of this source, B=6x10^12 G estim…
Multi-messenger and time-domain astronomy in the 2040s
Samaya Nissanke, Nikhil Sarin, Chris Copperwheat +31
Multi-messenger astronomy will be transformed in the 2040s by an unprecedented volume of detections from next-generation gravitational wave, high-energy, and ultra-high energy neut…
Detection of X-ray Emission from a Bright Long-Period Radio Transient
Ziteng Wang, Nanda Rea, Tong Bao +46
Recently, a class of long-period radio transients (LPTs) has been discovered, exhibiting emission on timescales thousands of times longer than radio pulsars. Several models had bee…
The X-ray properties of the black hole transient MAXI J1659-152 in quiescence
Jeroen Homan, Joel K. Fridriksson, Peter G. Jonker +5
We present new Chandra X-ray observations of the transient black hole X-ray binary MAXI J1659-152 in quiescence. These observations were made more than one year after the end of th…
IXPE detection of highly polarized X-rays from the magnetar 1E 1841-045
Michela Rigoselli, Roberto Taverna, Sandro Mereghetti +12
The Imaging X-ray Polarimetry Explorer (IXPE) observed for the first time highly polarized X-ray emission from the magnetar 1E 1841-045, targeted after a burst-active phase in Augu…
How Mass Flows Through Accretion Discs: A Spectral-Timing Vision for the 2040s
Simone Scaringi, Domitilla de Martino, Anna F. Pala +17
Understanding how mass and angular momentum flow through accretion discs remains a fundamental unsolved problem in astrophysics. Accreting white dwarfs offer an ideal laboratory fo…
Radio pulsar population synthesis with consistent flux measurements using simulation-based inference
Celsa Pardo Araujo, Michele Ronchi, Vanessa Graber +1
The properties of the entire neutron star population can be inferred by modeling their evolution, from birth to the present, through pulsar population synthesis. This involves simu…
The long-term enhanced brightness of the magnetar 1E 1547.0-5408
Francesco Coti Zelati, Alice Borghese, Nanda Rea +6
We present the evolution of the X-ray emission properties of the magnetar 1E 1547.0-5408 since February 2004 over a time period covering three outbursts. We analyzed new and archiv…
The fundamental plane for radio magnetars
Nanda Rea, Jose' A. Pons, Diego F. Torres +1
High magnetic fields are a distinguishing feature of neutron stars and the existence of sources (the soft gamma repeaters and the anomalous X-ray pulsars) hosting an ultra-magnetiz…
Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303
Diego F. Torres, Shu Zhang, Jian Li +6
We report on the analysis of Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring observations of the -ray binary system LS I +61 303, covering 35 ful…
A fast powerful X-ray transient from possible tidal disruption of a white dwarf
Dongyue Li, Wenda Zhang, Jun Yang +97
Stars captured by black holes (BHs) can be torn apart by strong tidal forces, producing electromagnetic flares. To date, more than 100 tidal disruption events (TDEs) have been obse…
First evidence of a cyclotron feature in an anomalous X-ray pulsar
Nanda Rea, Gian Luca Israel, Luigi Stella
We report on the results of the longest uninterrupted observation of the Anomalous X-ray Pulsar 1RXS J1708-4009 obtained with the BeppoSAX satellite in August 2001. In the phase-re…
Discovery of ASKAP J173608.2-321635 as a Highly-Polarized Transient Point Source with the Australian SKA Pathfinder
Ziteng Wang, David L. Kaplan, Tara Murphy +18
We report the discovery of a highly-polarized, highly-variable, steep-spectrum radio source, ASKAP J173608.2-321635, located 4\,deg from the Galactic center in the Galactic p…
Rotating Radio Transients: X-ray observations
Nanda Rea
Rotating Radio Transients (RRATs) are a new class of neutron stars discovered through the emission of radio bursts. Eleven sources are known up to now, but population studies predi…
The Science of the Einstein Telescope
Adrian Abac, Raul Abramo, Simone Albanesi +485
Einstein Telescope (ET) is the European project for a gravitational-wave (GW) observatory of third-generation. In this paper we present a comprehensive discussion of its science ob…
An intermediate polar candidate toward the Galactic plane
Samaresh Mondal, Gabriele Ponti, Frank Haberl +5
For the past decade, it has been suggested that intermediate polars (IPs), a subclass of magnetic cataclysmic variables (CVs), are one of the main contributors to the hard diffuse…
Broad-band study with Suzaku of the magnetar class
Teruaki Enoto, Kazuhiro Nakazawa, Kazuo Makishima +3
Broad-band (0.8-70 keV) spectra of the persistent X-ray emission from 9 magnetars were obtained with Suzaku, including 3 objects in apparent outburst. The soft X-ray component was…
A magnetar giant flare in the nearby starburst galaxy M82
Sandro Mereghetti, Michela Rigoselli, Ruben Salvaterra +32
Giant flares, short explosive events releasing up to 10 erg of energy in the gamma-ray band in less than one second, are the most spectacular manifestation of magnetars, you…
Multiwavelength Studies of Rotating Radio Transients
Joshua Miller, Maura McLaughlin, Nanda Rea +5
We describe our studies of the radio and high-energy properties of Rotating Radio Transients (RRATs). We find that the radio pulse intensity distributions are log-normal, with powe…
Probing multi-band variability and mode switching in the candidate transitional millisecond pulsar 3FGL J1544.6-1125
Giulia Illiano, Francesco Coti Zelati, Arianna Miraval Zanon +20
We present the most extensive high-time resolution multi-band campaign to date on the candidate transitional millisecond pulsar (tMSP) 3FGL J1544.6-1125 in the sub-luminous disk st…
Unveiling the super-orbital modulation of LSI +61 303 in X-rays
Jian Li, Diego F. Torres, Shu Zhang +5
We found evidence for the super-orbital modulation in the X-ray emission of LS I +61 303 from the longest monitoring date by the RXTE. The time evolution of the modulated fraction…
Modeling the broadband persistent emission of magnetars
Silvia Zane, Roberto Turolla, Luciano Nobili +1
In this paper, we discuss our first attempts to model the broadband persistent emission of magnetars within a self consistent, physical scenario. We present the predictions of a sy…
Simultaneous Monitoring of X-ray and Radio Variability in Sagittarius A*
Daniel M. Capellupo, Daryl Haggard, Nicolas Choux +14
Monitoring of Sagittarius A* from X-ray to radio wavelengths has revealed structured variability --- including X-ray flares --- but it is challenging to establish correlations betw…
The TeV binary HESS J0632+057 in the low and high X-ray state
Nanda Rea, Diego F. Torres
We report on a 40ks Chandra observation of the TeV emitting high mass X-ray binary HESS J0632+057 performed in February 2011 during a high-state of X-ray and TeV activity. We have…
Multiwavelength Analysis of the Einstein Probe X-ray Transient EP240305a
Ruican Ma, Ye Li, Lian Tao +32
We report multiwavelength observations of EP240305a, an uncatalogued X-ray transient detected by the Einstein Probe on March 5, 2024. The source exhibits distinct characteristics a…
Magnetar outbursts: an observational review
Nanda Rea, Paolo Esposito
Transient outbursts from magnetars have shown to be a key property of their emission, and one of the main way to discover new sources of this class. From the discovery of the first…
Discovery of burst oscillations in the intermittent accretion-powered millisecond pulsar HETE J1900.1-2455
Anna L. Watts, Diego Altamirano, Manuel Linares +8
We report the discovery of burst oscillations from the intermittent accretion-powered millisecond pulsar (AMP) HETE J1900.1-2455, with a frequency approximately 1 Hz below the know…
Long-period radio pulsars: population study in the neutron star and white dwarf rotating dipole scenarios
Nanda Rea, Natasha Hurley-Walker, Celsa Pardo-Araujo +9
The nature of two recently discovered radio emitters with unusually long periods of 18min (GLEAM-X J1627-52) and 21min (GPM J1839-10) is highly debated. Their bright radio emission…
Gamma-ray emission from PSR J0007+7303 using 7 years of Fermi Large Area Telescope observations
Jian Li, Diego F. Torres, Emma de Ona Wilhelmi +2
Based on more than seven years of Fermi Large Area Telescope (LAT) Pass 8 data, we report on a detailed analysis of the bright gamma-ray pulsar (PSR) J0007+7303. We confirm that PS…
Pulse Phase-coherent Timing and Spectroscopy of CXOU J164710.2-45521 Outbursts
Guillermo A. RodrÃguez Castillo, Gian Luca Israel, Paolo Esposito +5
We present a long-term phase-coherent timing analysis and pulse-phase resolved spectroscopy for the two outbursts observed from the transient anomalous X-ray pulsar CXOU J164710.2-…
Theoretically motivated search and detection of non-thermal pulsations from PSRs J1747-2958, J2021+3651, and J1826-1256
Jian Li, Diego F. Torres, Francesco Coti Zelati +3
Based on a theoretical selection of pulsars as candidates for detection at X-ray energies, we present an analysis of archival X-ray observations done with Chandra and XMM-Newton of…
Chandra Spectral and Timing Analysis of Sgr A*'s Brightest X-ray Flares
Daryl Haggard, Melania Nynka, Brayden Mon +17
We analyze the two brightest Chandra X-ray flares detected from Sagittarius A*, with peak luminosities more than 600 x and 245 x greater than the quiescent X-ray emission. The brig…
SAX J1808.4-3658: high resolution spectroscopy and decrease of pulsed fraction at low energies
Alessandro Patruno, Nanda Rea, Diego Altamirano +3
XMM-Newton observed the accreting millisecond pulsar SAX J1808.4-3658 during its 2008 outburst. We present timing and spectral analyses of this observation, in particular the first…
Pulsar Selection Criteria and Performance Evaluation of Autonomous X-ray Pulsar Navigation Systems
Sui Chen, Emilie Parent, Nanda Rea +1
Current space missions primarily depend on Earth-based Guidance, Navigation, and Control (GNC) systems involving human-in-the-loop operations. X-ray pulsar-based navigation offers…
The Hot and Energetic Universe: End points of stellar evolution
Christian Motch, Jörn Wilms, Didier Barret +22
White dwarfs, neutron stars and stellar mass black holes are key laboratories to study matter in most extreme conditions of gravity and magnetic field. The unprecedented effective…
X-rays breaking out of pre-explosion ejecta mark a supernova's first light
Weimin Yuan, Qiu-Ju Huang, Jin-Ping Zhu +130
Massive stars die as core-collapse supernovae, whose optical light emerges days after the implosion. Theory predicts that the initial collapse-driven shock, upon breaking through t…
GUEST: Gravitational Universe Exploration with Satellite Tracking. A passive satellite laser-ranging mission for the dark gravitational Universe
Diego Blas, Aurélien Hees, F. Javier Atapuerca +78
GUEST is a space mission concept whose central objective is the detection of gravitational waves (GWs) in the microhertz band -- a physics-rich frequency window that no other prese…
Long Period Transients (LPTs): a comprehensive review
Nanda Rea, Natasha Hurley-Walker, Manisha Caleb
Long Period Transients (LPTs) are a recently identified class of sources characterized by periodic radio bursts lasting seconds to minutes, with flux densities that might reach sev…
Multiwavelength Observations of the Apparently Non-repeating FRB 20250316A
Ye Li, Hui Sun, Lei Qian +72
The physical origin of fast radio bursts (FRBs) remains uncertain. Although multiwavelength observations have been widely conducted, only Galactic FRB~20200428D is associated with…
A highly resistive layer within the crust of X-ray pulsars limits their spin periods
Jose A. Pons, Daniele Viganò, Nanda Rea
The lack of X-ray pulsars with spin periods > 12 s raises the question of where the population of evolved high magnetic field neutron stars has gone. Unlike canonical radio pulsars…
Unveiling the super-orbital modulation of LS I +61 303 in X-rays
Jian Li, Diego F. Torres, Shu Zhang +5
From the longest monitoring of LS I +61 303 done to date by the Rossi X-ray Timing Explorer (RXTE) we found evidence for the long-sought, years- long modulation in the X-ray emissi…
3D evolution of neutron star magnetic-fields from a realistic core-collapse turbulent topology
Clara Dehman, Daniele Viganò, Stefano Ascenzi +2
We present the first 3D fully coupled magneto-thermal simulations of neutron stars (including the most realistic background structure and microphysical ingredients so far) applied…
A binary model of long period radio transients and white dwarf pulsars
Csanád Horváth, Nanda Rea, Natasha Hurley-Walker +3
Long-period radio transients (LPTs) represent a recently uncovered class of Galactic radio sources exhibiting minute-to-hour periodicities and highly polarised pulses of second-to-…
Magnetars
Nanda Rea, Davide De Grandis
Magnetars are the most magnetic objects in the Universe, serving as unique laboratories to test physics under extreme magnetic conditions that cannot be replicated on Earth. They w…
Neutron-star Measurements in the Multi-messenger Era
Stefano Ascenzi, Vanessa Graber, Nanda Rea
Neutron stars are compact and dense celestial objects that offer the unique opportunity to explore matter and its interactions under conditions that cannot be reproduced elsewhere…
Probing Neutron Star Interiors and the Properties of Cold Ultra-dense Matter with the SKAO
Avishek Basu, Vanessa Graber, Marcus E. Lower +19
Matter inside neutron stars is compressed to densities several times greater than nuclear saturation density, while maintaining low temperatures and large asymmetries between neutr…
Resolving the 2024 Outburst of Magnetar 1E 1841-045 from its host Supernova Remnant with EP-FXT
Yu-Cong Fu, Lin Lin, Yu-Jia Zheng +11
The magnetar 1E 1841-045 exhibited a new active episode starting on August 20, 2024, marked by X-ray bursts and enhanced persistent emission. Using data from the Einstein Probe (EP…
3D code for MAgneto-Thermal evolution in Isolated Neutron Stars, MATINS: The Magnetic Field Formalism
Clara Dehman, Daniele Viganò, José A. Pons +1
The long-term evolution of the internal, strong magnetic fields of neutron stars needs a specific numerical modelling. The diversity of the observed phenomenology of neutron stars…
Discovery of periodicities in two highly variable intermediate polars towards the Galactic Center
Samaresh Mondal, Gabriele Ponti, Frank Haberl +5
We discovered Fe complex emission and pulsation in two highly variable sources (4XMM J174917.7--283329, 4XMM J174954.6--294336). The equivalent widths of 6.4 and 6.7 keV lin…
Discovery of PSR J0523-7125 as a Circularly Polarized Variable Radio Source in the Large Magellanic Cloud
Yuanming Wang, Tara Murphy, David L. Kaplan +23
We report the discovery of a highly circularly polarized, variable, steep-spectrum pulsar in the Australian Square Kilometre Array Pathfinder (ASKAP) Variables and Slow Transients…
VAST: An ASKAP Survey for Variables and Slow Transients
Tara Murphy, Shami Chatterjee, David L. Kaplan +36
The Australian Square Kilometre Array Pathfinder (ASKAP) will give us an unprecedented opportunity to investigate the transient sky at radio wavelengths. In this paper we present V…
How bright can old magnetars be? Assessing the impact of magnetized envelopes and field topology on neutron star cooling
Clara Dehman, José A. Pons, Daniele Viganò +1
Neutron stars cool down during their lifetime through the combination of neutrino emission from the interior and photon cooling from the surface. Strongly magnetised neutron stars,…
Magnetars' Giant Flares: the case of SGR 1806-20
Nanda Rea
We first review on the peculiar characteristics of the bursting and flaring activity of the Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars. We then report on the properties o…
Constraining meV Axion Dark Matter with ALMA Observations of the Galactic Center Magnetar SGR 1745-2900
Javier De Miguel, Evanthia Hatziminaoglou, Frédéric Poidevin +4
We report a mm-wave search for axion dark matter from SGR 1745-2900, based on 4.8 h of ALMA observations. No candidate features are found between 133.99-135.78, 135.91-137.70, 145.…
New X-ray Supernova Remnants in NGC 7793
Maria Kopsacheili, Konstantina Anastasopoulou, Nanda Rea +2
This work focuses on the detection of X-ray Supernova Remnants (SNRs) in the galaxy NGC 7793 and the study of their properties. X-ray SNRs in galaxies beyond the Local Group are ra…
Magnetar fraction in Core-Collapse Supernovae
Celsa Pardo-Araujo, Nanda Rea, Michele Ronchi +1
Magnetars are extreme neutron stars powered by ultra-strong magnetic fields ( Gauss) and are compelling engines for some of the most powerful extragalactic transients…
Search for transitions between states in redbacks and black widows using seven years of Fermi-LAT observations
Diego F. Torres, Long Ji, Jian Li +4
Considering about seven years of Fermi-Large Area Telescope (LAT) data, we present a systematic search for variability possibly related to transitions between states in redbacks an…
Possible changes of state and relevant timescales for a neutron star in LS I +61°303
Alessandro Papitto, Diego F. Torres, Nanda Rea
The properties of the short, energetic bursts recently observed from the gamma-ray binary LS I +61°303, are typical of those showed by high magnetic field neutron stars, and thus…
XIPE: the X-ray Imaging Polarimetry Explorer
Paolo Soffitta, Xavier Barcons, Ronaldo Bellazzini +96
X-ray polarimetry, sometimes alone, and sometimes coupled to spectral and temporal variability measurements and to imaging, allows a wealth of physical phenomena in astrophysics to…
Unifying the observational diversity of isolated neutron stars via magneto-thermal evolution models
Daniele Viganò, Nanda Rea, Jose A. Pons +3
Observations of magnetars and some of the high magnetic field pulsars have shown that their thermal luminosity is systematically higher than that of classical radio-pulsars, thus c…
Magnetars: neutron stars with huge magnetic storms
Nanda Rea
Among the many different classes of stellar objects, neutron stars provide a unique environment where we can test (at the same time) our understanding of matter with extreme densit…
3D code for MAgneto-Thermal evolution in Isolated Neutron Stars, MATINS: thermal evolution and lightcurves
Stefano Ascenzi, Daniele Viganò, Clara Dehman +3
The thermal evolution of isolated neutron stars is a key element in unraveling their internal structure and composition and establishing evolutionary connections among different ob…
A persistent bow shock in a diskless magnetised accreting white dwarf
Krystian Ilkiewicz, Simone Scaringi, Domitilla de Martino +9
Stellar bow shocks are formed when an outflow interacts with the interstellar medium. In white dwarfs accreting from a binary companion, outflows are associated with either strong…