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The Mysterious Magnetospheres of Magnetars
Matthew G. Baring, Zorawar Wadiasingh, Peter L. Gonthier +2
Magnetars are the most luminous compact objects in the stellar mass range observed in the Milky Way, with giant flares of hard X-ray power ~10^45 erg/sec being detected from three…
Observation of a sudden cessation of a very-high-energy gamma-ray flare in PKS 1510-089 with H.E.S.S. and MAGIC in May 2016
H. E. S. S. Collaboration, H. Abdalla, R. Adam +430
The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behavior, and is one of only a few FSRQs detected at very high energy (VHE, GeV…
A Comprehensive X-ray Report on AT2019wey
Yuhan Yao, S. R. Kulkarni, K. C. Gendreau +25
Here, we present MAXI, SWIFT, NICER, NuSTAR and Chandra observations of the X-ray transient AT2019wey (SRGA J043520.9+552226, SRGE J043523.3+552234). From spectral and timing analy…
An extreme particle accelerator in the Galactic plane: HESS J1826130
H. E. S. S. Collaboration, H. Abdalla, R. Adam +236
The unidentified very-high-energy (VHE; E 0.1 TeV) -ray source, HESS J1826130, was discovered with the High Energy Stereoscopic System (HESS) in the Galactic plane. The a…
X-ray Through Very-High-Energy Intrabinary Shock Emission from Black Widows and Redbacks
Christian J. T. van der Merwe, Zorawar Wadiasingh, Christo Venter +2
Black widow and redback systems are compact binaries in which a millisecond pulsar heats and may even ablate its low-mass companion by its intense wind of relativistic particles an…
Search for dark matter signals towards a selection of recently-detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdallah +227
Dwarf spheroidal galaxy satellites of the Milky Way are prime targets for indirect detection of dark matter with gamma rays due to their proximity, high dark matter content and abs…
The Multipolar Magnetic Field of Millisecond Pulsar PSR J0030+0451
Constantinos Kalapotharakos, Zorawar Wadiasingh, Alice K. Harding +1
Modeling of the NICER X-ray waveform of the pulsar PSR J0030+0451, aimed to constrain the neutron star mass and radius, has inferred surface hot-spots (the magnetic polar caps) tha…
The NICER View of the 2020 Burst Storm and Persistent Emission of SGR 1935+2154
George Younes, Tolga Guver, Chryssa Kouveliotou +12
We report on NICER observations of the Magnetar SGR~1935+2154, covering its 2020 burst storm and long-term persistent emission evolution up to days post outburst. During t…
NICER Observation of the Temporal and Spectral Evolution of Swift J1818.0-1607: a Missing Link between Magnetars and Rotation Powered Pulsars
Chin-Ping Hu, Beste Begicarslan, Tolga Guver +13
We report on the hard X-ray burst and the first ~100 days NICER monitoring of the soft X-ray temporal and spectral evolution of the newly-discovered magnetar Swift J1818.0-1607. Th…
Radio pulsations from the -ray millisecond pulsar PSR J2039-5617
A. Corongiu, R. P. Mignani, A. S. Seyffert +9
The predicted nature of the candidate redback pulsar 3FGL\,J2039.65618 was recently confirmed by the discovery of -ray millisecond pulsations (Clark et al. 2020, hereafter Pa…
Einstein@Home Discovery of the Gamma-ray Millisecond Pulsar PSR J2039-5617 Confirms Its Predicted Redback Nature
C. J. Clark, L. Nieder, G. Voisin +19
The Fermi Large Area Telescope gamma-ray source 3FGL J2039.65618 contains a periodic optical and X-ray source that was predicted to be a "redback" millisecond pulsar (MSP) binar…
A radiatively-quiet glitch and anti-glitch in the magnetar 1E 2259+586
G. Younes, P. S. Ray, M. G. Baring +5
We report on the timing and spectral properties of the soft X-ray emission from the magnetar 1E 2259+586 from January 2013, months after the detection of an anti-glitch, u…
Fast Radio Burst Trains from Magnetar Oscillations
Zorawar Wadiasingh, Cecilia Chirenti
Quasi-periodic oscillations inferred during rare magnetar giant flare tails were initially interpreted as torsional oscillations of the neutron star (NS) crust, and have been more…
Probing the magnetic field in the GW170817 outflow using H.E.S.S. observations
H. E. S. S. Collaboration, :, H. Abdalla +230
The detection of the first electromagnetic counterpart to the binary neutron star (BNS) merger remnant GW170817 established the connection between short -ray bursts and BNS merg…
Very high energy -ray emission from two blazars of unknown redshift and upper limits on their distance
H. E. S. S. Collaboration, H. Abdalla, R. Adam +225
We report on the detection of very-high-energy (VHE; GeV) -ray emission from the BL Lac objects KUV 00311-1938 and PKS 1440-389 with the High Energy Stereoscopic Syste…
Periodicity in recurrent fast radio bursts and the origin of ultra long period magnetars
Paz Beniamini, Zorawar Wadiasingh, Brian D. Metzger
The recurrent fast radio burst FRB 180916 was recently shown to exhibit a 16 day period (with possible aliasing) in its bursting activity. Given magnetars as widely considered FRB…
Simultaneous magnetic polar cap heating during a flaring episode from the magnetar 1RXS J170849.0-400910
George Younes, Matthew G. Baring, Chryssa Kouveliotou +3
During a pointed 2018 NuSTAR observation, we detected a flare with a 2.2 hour duration from the magnetar 1RXS J170849.0400910. The flare, which rose in seconds to a max…