Publications (73)
HI Galaxy Signatures in the SARAO MeerKAT Galactic Plane Survey I. Probing the richness of the Great Attractor Wall across the inner Zone of Avoidance
Nadia Steyn, Renée C. Kraan-Korteweg, Sambatriniaina H. A. Rajohnson +7
This paper presents the first HI results extracted from the SARAO MeerKAT Galactic Plane Survey (SMGPS) a narrow strip () along the southern Milky Way. The prim…
Probing the Masses of the PSR J0621+1002 Binary System Through Relativistic Apsidal Motion
Eric M. Splaver, David J. Nice, Zaven Arzoumanian +3
Orbital, spin and astrometric parameters of the millisecond pulsar PSR J0621+1002 have been determined through six years of timing observations at three radio telescopes. The chief…
Discovery of PSR J1227-4853: A transition from a low-mass X-ray binary to a redback millisecond pulsar
Jayanta Roy, Paul S. Ray, Bhaswati Bhattacharyya +12
XSS J12270-4859 is an X-ray binary associated with the Fermi LAT gamma-ray source 1FGL J1227.9-4852. In 2012 December, this source underwent a transition where the X-ray and optica…
Is IGR J11014-6103 a Pulsar with the Highest Known Kick Velocity?
John A. Tomsick, Arash Bodaghee, Jerome Rodriguez +4
We report on Chandra X-ray and Parkes radio observations of IGR J11014-6103, which is a possible pulsar wind nebula with a complex X-ray morphology and a likely radio counterpart.…
An Image-Based Search for Pulsar Candidates in the MeerKAT Bulge Survey
Dale A. Frail, Emil Polisensky, Scott D. Hyman +13
We report on the results of an image-based search for pulsar candidates toward the Galactic bulge. We used mosaic images from the MeerKAT radio telescope, that were taken as part o…
The Panchromatic Afterglow of GW170817: The full uniform dataset, modeling, comparison with previous results and implications
Sphesihle Makhathini, Kunal P. Mooley, Murray Brightman +35
We present the full panchromatic afterglow light curve data of GW170817, including new radio data as well as archival optical and X-ray data, between 0.5 and 940 days post-merger.…
A precise mass measurement of the intermediate-mass binary pulsar PSR J1802-2124
Robert D. Ferdman, Ingrid H. Stairs, Michael Kramer +14
PSR J1802-2124 is a 12.6-ms pulsar in a 16.8-hour binary orbit with a relatively massive white dwarf (WD) companion. These properties make it a member of the intermediate-mass clas…
The SARAO MeerKAT Galactic Plane Survey filamentary source catalogue
Gwenllian M. Williams, Mark A. Thompson, Mubela Mutale +11
We present a catalogue of filamentary structures identified in the SARAO (South African Radio Astronomy Observatory) MeerKAT 1.3 GHz Galactic Plane Survey (SMGPS). We extract 933 f…
The First Pulsar Discovered by FAST
Lei Qian, Zhichen Pan, Di Li +20
To assist with the commissioning (Jiang et al. 2019) of the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we performed a pulsar search, with the primary goal of dev…
Neutral Hydrogen Absorption Toward XTE J1810-197: the Distance to a Radio-Emitting Magnetar
Anthony H. Minter, Fernando Camilo, Scott M. Ransom +2
We have used the Green Bank Telescope to measure HI absorption against the anomalous X-ray pulsar XTE J1810-197. Assuming a flat rotation curve, we find that XTE J1810-197 is locat…
A Serendipitous Pulsar Discovery in a Search for a Companion to a Low-Mass White Dwarf
Jeff J. Andrews, Marcel A. Agüeros, Fernando Camilo +4
We report the discovery of a previously unidentified pulsar as part of a radio campaign to identify neutron star companions to low-mass white dwarfs (LMWDs) using the Robert C.\ By…
The Balmer-dominated Bow Shock and Wind Nebula Structure of Gamma-ray Pulsar PSR J1741-2054
Roger W. Romani, Michael S. Shaw, Fernando Camilo +2
We have detected an Halpha bow shock nebula around PSR J1741-2054, a pulsar discovered through its GeV gamma-ray pulsations. The pulsar is only ~1.5" behind the leading edge of the…
Twenty-One Millisecond Pulsars in Terzan 5 Using the Green Bank Telescope
Scott M. Ransom, Jason W. T. Hessels, Ingrid H. Stairs +4
We have discovered 21 millisecond pulsars (MSPs) in the globular cluster Terzan 5 using the Green Bank Telescope, bringing the total of known MSPs in Terzan 5 to 24. These discover…
Pulsed radio emission from a Central Compact Object
Lei Zhang, Alessandro Ridolfi, Di Li +7
Located at the centres of supernova remnants, central compact objects (CCOs) are among the most puzzling neutron stars. CCOs are bright in thermal X-rays, yet have evaded detection…
Transient narrowband radio bursts from the magnetar 1E 1547.0-5408
Marcus E. Lower, Paul Scholz, Fernando Camilo +5
Radio-loud magnetars are well known for exhibiting radiative behaviors that are seldom seen among the wider pulsar population. Yet one form of emission that remains elusive among p…
The Third Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
David A. Smith, Philippe Bruel, Colin J. Clark +156
We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. Another 33 millisecond pulsars (MSPs) discovered in deep radio…
The MeerKAT Pulsar Timing Array: The -year data release and the noise and stochastic signals of the millisecond pulsar population
Matthew T. Miles, Ryan M. Shannon, Daniel J. Reardon +21
Pulsar timing arrays are ensembles of regularly observed millisecond pulsars timed to high precision. Each pulsar in an array could be affected by a suite of noise processes, most…
Millisecond Pulsars in 47 Tucanae
Paulo C. Freire, Fernando Camilo, Duncan R. Lorimer +2
Recent observations of the globular cluster 47 Tuc, made with the Parkes telescope at a wavelength of 20 cm, have resulted in the discovery of nine new millisecond pulsars, all in…
Pulsars in Globular Clusters
Fernando Camilo, Frederic A. Rasio
More than 100 radio pulsars have been detected in 24 globular clusters. The largest observed samples are in Terzan 5 and 47 Tucanae, which together contain 45 pulsars. Accurate tim…
Deep Searches for Young Pulsars
Fernando Camilo
By 2000 there were only 10 established Galactic pulsar-supernova remnant associations. Two years later there are 16 such associations known. I discuss the work leading to this subs…
The Runaway Binary LP 400-22 is Leaving the Galaxy
Mukremin Kilic, A. Gianninas, Warren R. Brown +7
We present optical spectroscopy, astrometry, radio, and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial v…
A multi-wavelength search for a counterpart of the unidentified gamma-ray source 3EG J2020+4017 (2CG078+2)
Werner Becker, Martin C. Weisskopf, Zaven Arzoumanian +8
In search of the counterpart to the brightest unidentified gamma-ray source 3EG J2020+4017 we report on new X-ray and radio observations of the gamma-Cygni field with the Chandra X…
Detection of relativistic orbital deformation from improved timing of PSR J17571854
Jaikhomba Singha, Vivek Venkatraman Krishnan, Marisa Geyer +12
PSR~J17571854, a 21.5\,ms pulsar, is a highly relativistic double neutron star (DNS) system in a tight eccentric () 4.4\,hr orbit. With extremely large gravitational w…
Multifrequency Observations of Radio Pulse Broadening and Constraints on Interstellar Electron Density Microstructure
N. D. Ramesh Bhat, James M. Cordes, Fernando Camilo +2
We have made observations of 98 low-Galactic-latitude pulsars to measure pulse broadening caused by multipath propagation through the interstellar medium. Data were collected with…
A Radio Search For Pulsar Companions To SDSS Low-Mass White Dwarfs
Marcel A. Agueros, Fernando Camilo, Nicole M. Silvestri +3
We have conducted a search for pulsar companions to 15 low-mass white dwarfs (LMWDs; M < 0.4 M_Sun) at 820 MHz with the NRAO Green Bank Telescope (GBT). These LMWDs were spectrosco…
Searching for Millisecond Pulsars in Globular Clusters at Parkes: Further Results
Andrea Possenti, Nichi D'Amico, Richard N. Manchester +3
We have discovered 12 new millisecond pulsars in 6 globular clusters in which no pulsars were previously known, in the first two years of a search at 1.4 GHz in progress at the Par…
Multiband Optical Light Curves of Black-Widow Pulsars
Paul Draghis, Roger W. Romani, Alexei V. Filippenko +4
We collect new and archival optical observations of nine "black-widow" millisecond pulsar binaries. New measurements include direct imaging with the Keck, Gemini-S, MDM, and LCO 2~…
X-ray and Radio Timing of the Pulsar in 3C 58
Margaret A. Livingstone, Scott Ransom, Fernando Camilo +4
We present timing data spanning 6.4 yr for the young and energetic PSR J0205+6449, in the supernova remnant 3C 58. Data were obtained with the Rossi X-ray Timing Explorer, the Jodr…
The MeerKAT Pulsar Timing Array: The first search for gravitational waves with the MeerKAT radio telescope
Matthew T. Miles, Ryan M. Shannon, Daniel J. Reardon +22
Pulsar Timing Arrays search for nanohertz-frequency gravitational waves by regularly observing ensembles of millisecond pulsars over many years to look for correlated timing residu…
A GTC spectroscopic study of three spider pulsar companions: line-based temperatures, a new face-on redback, and improved mass constraints
Jordan A. Simpson, Manuel Linares, Jorge Casares +3
We present GTC-OSIRIS phase-resolved optical spectroscopy of three compact binary MSPs, or 'spiders': PSR J1048+2339, PSR J1810+1744, and (for the first time) PSR J1908+2105. For t…
Recently discovered pulsars and unidentified EGRET sources
Diego F. Torres, Yousaf M. Butt, Fernando Camilo
We present a correlative study between all unidentified EGRET sources at low Galactic latitudes and the newly discovered pulsars in the released portion of the Parkes multibeam rad…
A joint MeerKAT and Parkes view of Omega Centauri: New TRAPUM Searches and Pulsar Timing
Miquel Colom i Bernadich, Shi Dai, Federico Abbate +27
Millisecond pulsars (MSPs) are powerful probes of globular clusters (GCs), tracing stellar evolution, cluster dynamics, and the local gravitational potential. We investigate the MS…
The Evolution of PSR J0737-3039B and a Model for Relativistic Spin Precession
Benetge Perera, Maura McLaughlin, Michael Kramer +9
We present the evolution of the radio emission from the 2.8-s pulsar of the double pulsar system PSR J0737-3039A/B. We provide an update on the Burgay et al. (2005) analysis by des…
Transient pulsed radio emission from a magnetar
Fernando Camilo, Scott Ransom, Jules Halpern +4
Anomalous X-ray pulsars (AXPs) are slowly rotating neutron stars with very bright and highly variable X-ray emission that are believed to be powered by ultra-strong magnetic fields…
X-Ray Timing of the Young Pulsar in 3C 58
Scott Ransom, Fernando Camilo, Victoria Kaspi +4
PSR J0205+6449 is a young pulsar in the Crab-like pulsar wind nebula 3C 58 which is thought to be a result of the historical supernova SN1181 CE. The 65.7-ms pulsar is the second m…
The dynamic magnetosphere of Swift J1818.01607
Marcus E. Lower, Simon Johnston, Ryan M. Shannon +2
Radio-loud magnetars display a wide variety of radio-pulse phenomenology seldom seen among the population of rotation-powered pulsars. Spectropolarimetry of the radio pulses from t…
Optical Detection of a Variable Millisecond Pulsar Companion in 47 Tucanae
Peter D. Edmonds, Ronald L. Gilliland, Craig O. Heinke +2
Using results from radio and X-ray observations of millisecond pulsars in 47 Tucanae, and extensive HST U, V, I imaging of the globular cluster core, we have derived a common astro…
Discovery of Millisecond Pulsars in the Globular Cluster Omega Centauri
Shi Dai, Simon Johnston, Matthew Kerr +4
The globular cluster Omega Centauri is the most massive and luminous cluster in the Galaxy. The -ray source FL8Y J1326.74729 is coincident with the core of the cluster, lead…
The Radio Emission, X-ray Emission, and Hydrodynamics of G328.4+0.2: A Comprehensive Analysis of a Luminous Pulsar Wind Nebula, its Neutron Star, and the Progenitor Supernova Explosion
Joseph D. Gelfand, B. M. Gaensler, Patrick O. Slane +3
We present new observational results obtained for the Galactic non-thermal radio source G328.4+0.2 to determine both if this source is a pulsar wind nebula or supernova remnant, an…
Accurate Masses for the Primary and Secondary in the Eclipsing White Dwarf Binary NLTT 11748
Mukremin Kilic, Carlos Allende Prieto, Warren R. Brown +3
We measure the radial velocity curve of the eclipsing detached white dwarf binary NLTT 11748. The primary exhibits velocity variations with a semi-amplitude of 273 km/s and an orbi…
The double neutron star PSR J1946+2052 I. Masses and tests of general relativity
Lingqi Meng, Paulo C. C. Freire, Kevin Stovall +28
We conducted high-precision timing of PSR J1946+2052 to determine the masses of the two neutron stars in the system, test general relativity (GR) and assessed the system's potentia…
Radio Properties of Rotating Radio Transients I: searches for periodicities and randomness in pulse arrival times
Nipuni Palliyaguru, Maura McLaughlin, Evan Keane +6
We have analysed the long- and short-term time dependence of the pulse arrival times and the pulse detection rates for eight Rotating Radio Transient (RRAT) sources from the Parkes…
A 350-MHz GBT Survey of 50 Faint Fermi Gamma-ray Sources for Radio Millisecond Pulsars
Jason W. T. Hessels, Mallory S. E. Roberts, Maura A. McLaughlin +7
We have used the Green Bank Telescope at 350MHz to search 50 faint, unidentified Fermi Gamma-ray sources for radio pulsations. So far, these searches have resulted in the discovery…
Solar Observation with MeerKAT: Demonstration of Technical Readiness and Initial Science Highlight
Devojyoti Kansabanik, Marcel Gouws, Deepan Patra +6
Solar radio emissions offer unique diagnostic insights into the solar corona. However, their dynamic and multiscale nature, along with several orders of magnitude variations in int…
The SARAO MeerKAT Galactic Plane Survey compact source catalogue
Mubela Mutale, Mark A. Thompson, Gwenllian M. Williams +11
We present a catalogue of compact sources detected in the SARAO MeerKAT 1.3 GHz Galactic Plane Survey (SMGPS). We extract 510599 compact sources, with areas less than five 8" beams…
HI Galaxy Signatures in the SARAO MeerKAT Galactic Plane Survey -- III. Unveiling the obscured part of the Vela Supercluster
Sambatriniaina H. A. Rajohnson, Renée C. Kraan-Korteweg, Hao Chen +8
We conducted a search for HI emission of the gas-rich galaxies in the Vela region () to explore the Vela S…
The 2022 high-energy outburst and radio disappearing act of the magnetar 1E 1547.0-5408
Marcus E. Lower, George Younes, Paul Scholz +19
We report the radio and high-energy properties of a new outburst from the radio-loud magnetar 1E 1547.05408. Following the detection of a short burst from the source with Swift-…
No Neutron Star Companion To The Lowest Mass SDSS White Dwarf
Marcel Agueros, Craig Heinke, Fernando Camilo +6
SDSS J091709.55+463821.8 (hereafter J0917+4638) is the lowest surface gravity white dwarf (WD) currently known, with log g = 5.55 +/- 0.05 (M ~ 0.17 M_sun; Kilic et al. 2007a,b). S…
Properties and Evolution of the Redback Millisecond Pulsar Binary PSR J2129-0429
Eric C. Bellm, David L. Kaplan, Rene P. Breton +19
PSR J2129-0429 is a "redback" eclipsing millisecond pulsar binary with an unusually long 15.2 hour orbit. It was discovered by the Green Bank Telescope in a targeted search of unid…
Chandra Observations of Black-Widow Pulsars
Peter Gentile, Maura McLaughlin, Mallory Roberts +6
We describe the first X-ray observations of binary millisecond pulsars PSRs J0023+0923, J1810+1744, J2215+5135, and J2256-1024. All four are Fermi gamma-ray sources and three are '…
Eight new MSPs in NGC 6440 and NGC 6441
Paulo C. C. Freire, Scott M. Ransom, Steve Begin +4
We report the discovery of five new millisecond pulsars in the globular cluster NGC 6440 and three new ones in NGC 6441; each cluster has one previously known pulsar. Four of the n…
The MeerKAT Pulsar Timing Array: First Data Release
Matthew T. Miles, Ryan M. Shannon, Matthew Bailes +15
We present the first 2.5 years of data from the MeerKAT Pulsar Timing Array (MPTA), part of MeerTime, a MeerKAT Large Survey Project. The MPTA aims to precisely measure pulse arriv…
Vacuum birefringence and the polarized X-ray emission from a radio magnetar
Rachael E. Stewart, Hoa Dinh Thi, George Younes +13
The paper presents phase- and energy-resolved X‑ray polarization measurements of the radio magnetar 1E 1547.0‑5408, finding high polarization degrees that support vacuum birefringe…
VLBA Astrometry of the Fastest-spinning Magnetar Swift J1818.0-1607: A Large Trigonometric Distance & A Small Transverse Velocity
Hao Ding, Marcus E. Lower, Adam T. Deller +3
In addition to being the most magnetic objects in the known universe, magnetars are the only objects observed to generate fast-radio-burst-like emissions. The formation mechanism o…
HI Galaxy Signatures in the SARAO MeerKAT Galactic Plane Survey -- II. The Local Void and its substructure
Sushma Kurapati, Renée C. Kraan-Korteweg, D. J. Pisano +7
The Local Void is one of the nearest large voids, located at a distance of 23 Mpc. It lies largely behind the Galactic Bulge and is therefore extremely difficult to observe. We use…
Wideband polarized radio emission from the newly revived magnetar XTE J1810197
Shi Dai, Marcus E. Lower, Matthew Bailes +7
The anomalous X-ray pulsar XTE J1810197 was the first magnetar found to emit pulsed radio emission. After spending almost a decade in a quiescent, radio-silent state, the magnet…
Relativistic Spin Precession in the Double Pulsar
Rene P. Breton, Victoria M. Kaspi, Michael Kramer +7
The double pulsar PSR J0737-3039A/B consists of two neutron stars in a highly relativistic orbit that displays a roughly 30-second eclipse when pulsar A passes behind pulsar B. Des…
Arecibo timing observations of 17 pulsars along the Galactic plane
Duncan R. Lorimer, Fernando Camilo, Kiraki Xilouris
We present phase-coherent timing solutions obtained for the first time for 17 pulsars discovered at Arecibo by Hulse & Taylor (1975ab) in a 430-MHz survey of the Galactic plane. Th…
The ELM Survey. VIII. 98 Double White Dwarf Binaries
Warren R. Brown, Mukremin Kilic, Alekzander Kosakowski +7
We present the final sample of 98 detached double white dwarf (WD) binaries found in the Extremely Low Mass (ELM) Survey, a spectroscopic survey targeting <0.3 Msun He-core WDs com…
Bow Shock and Local Bubble Plasma Unveiled by the Scintillating Millisecond Pulsar J04374715
Daniel J. Reardon, Robert Main, Stella Koch Ocker +10
The ionized interstellar medium contains au-scale (and below) structures that scatter radio waves from pulsars, resulting in scintillation. Power spectral analysis of scintillation…
MeerKAT Pulsar Timing Array parallaxes and proper motions
Mohsen Shamohammadi, Matthew Bailes, Christopher Flynn +10
We have determined positions, proper motions, and parallaxes of millisecond pulsars (MSPs) from years of MeerKAT radio telescope observations. Our timing and noise ana…
A Millisecond Pulsar Optical Counterpart with Large-Amplitude Variability in the Globular Cluster 47 Tucanae
Peter D. Edmonds, Ronald L. Gilliland, Fernando Camilo +2
Using extensive HST imaging, combined with Chandra X-ray and Parkes radio data, we have detected the optical binary companion to a second millisecond pulsar (MSP) in the globular c…
A Radio Pulsar Spinning at 716 Hz
Jason W. T. Hessels, Scott M. Ransom, Ingrid H. Stairs +3
We have discovered a 716-Hz eclipsing binary radio pulsar in the globular cluster Terzan 5 using the Green Bank Telescope. It is the fastest-spinning neutron star ever found, break…
Searches for Young Pulsars
Fernando Camilo
I review the results of radio and X-ray searches for pulsations from young neutron stars, emphasizing work accomplished in the last five years. I cover undirected searches, as well…
Timing Gamma-ray Pulsars with the Fermi Large Area Telescope: Timing Noise and Astrometry
Matthew Kerr, Paul Ray, Simon Johnston +2
We have constructed timing solutions for 81 gamma-ray pulsars covering more than five years of Fermi data. The sample includes 37 radio-quiet or radio-faint pulsars which cannot be…
Discovery, Timing, and Multiwavelength Observations of the Black Widow Millisecond Pulsar PSR J1555-2908
Paul S. Ray, Lars Nieder, Colin J. Clark +21
We report the discovery of PSR J1555-2908, a 1.79 ms radio and gamma-ray pulsar in a 5.6 hr binary system with a minimum companion mass of 0.052 . This fast and energetic…
Searching a Thousand Radio Pulsars for Gamma-ray Emission
David A. Smith, Philippe Bruel, Ismaël Cognard +15
Identifying as many gamma-ray pulsars as possible in the Fermi Large Area Telescope (LAT) data helps test pulsar emission models by comparing predicted and observed properties for…
A Binary Millisecond Pulsar in Globular Cluster NGC6544
Scott M. Ransom, Lincoln J. Greenhill, James R. Herrnstein +4
We report the detection of a new 3.06 ms binary pulsar in the globular cluster NGC6544 using a Fourier-domain ``acceleration'' search. With an implied companion mass of ~0.01 solar…
Linear to circular conversion in the polarized radio emission of a magnetar
Marcus E. Lower, Simon Johnston, Maxim Lyutikov +13
Radio emission from magnetars provides a unique probe of the relativistic, magnetized plasma within the near-field environment of these ultra-magnetic neutron stars. The transmitte…
Breakthrough Listen's Automated Commensal Technosignature Survey with MeerKAT
Daniel J. Czech, David H. E. MacMahon, Ian Heywood +20
The search for extraterrestrial intelligence (SETI) is an ongoing effort to detect technosignatures, evidence of technologically capable life beyond Earth. Conducting a comprehensi…
The Binary Nature of PSR J2032+4127
Andrew Lyne, Ben Stappers, Michael Keith +4
PSR J2032+4127 is a gamma-ray and radio-emitting pulsar which has been regarded as a young luminous isolated neutron star. However, its recent spin-down rate has extraordinarily in…
Eight New Millisecond Pulsars in NGC 6440 and NGC 6441
Paulo C. C. Freire, Scott M. Ransom, Steve Begin +4
Motivated by the recent discovery of 30 new millisecond pulsars in Terzan 5, made using the Green Bank Telescope's S-band receiver and the Pulsar Spigot spectrometer, we have set o…
Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae
Slavko Bogdanov, Jonathan E. Grindlay, Craig O. Heinke +3
We present spectral and long-timescale variability analyses of \textit{Chandra} ACIS-S observations of the 19 millisecond pulsars (MSPs) with precisely known positions in the globu…