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The Full Spectrum Galactic Terrarium: MHz to TeV Observations of Various Critters
Mallory S. E. Roberts, C. Brogan, S. Ransom +13
Multi-wavelength studies at radio, infrared, optical, X-ray, and TeV wavelengths have discovered probable counterparts to many Galactic sources of GeV emission detected by EGRET. T…
Arecibo Pulsar Survey Using ALFA: Probing Radio Pulsar Intermittency and Transients
J. S. Deneva, J. M. Cordes, M. A. McLaughlin +23
We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) Survey of the Galactic plane. We have discovered seven objects by…
Pulsar Timing for the Fermi Gamma-ray Space Telescope
D. A. Smith, L. Guillemot, F. Camilo +25
We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the {\em Fermi Gamma-ray Space Telescope} (formerly GLAST). The detection and study of…
Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE
J. P. Halpern, F. Camilo, A. Giuliani +7
Discovered after the end of the Compton Gamma-Ray Observatory mission, the radio pulsar PSR J2021+3651 was long considered a likely counterpart of the high-energy gamma-ray source…
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…
Chandra X-Ray Observatory Observations of the Globular Cluster M71
R. F. Elsner, C. O. Heinke, H. N. Cohn +12
We observed the nearby, low-density globular cluster M71 (NGC 6838) with the Chandra X-ray Observatory to study its faint X-ray populations. Five X-ray sources were found inside th…
PSR J1856+0245: Arecibo Discovery of a Young, Energetic Pulsar Coincident with the TeV Gamma-ray Source HESS J1857+026
J. W. T. Hessels, D. J. Nice, B. M. Gaensler +21
We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81ms, a characteristic age of 21kyr, and a spin-d…
An Eccentric Binary Millisecond Pulsar in the Galactic Plane
D. J. Champion, S. M. Ransom, P. Lazarus +28
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+032…
A puzzling millisecond pulsar companion in NGC 6266
G. Cocozza, F. R. Ferraro, A. Possenti +5
We report on the optical identification of the companion to the eclipsing millisecond pulsar PSR J17013006B in the globular cluster NGC 6266. A relatively bright star with an an…
Outburst of the 2 s Anomalous X-ray Pulsar 1E 1547.0-5408
J. P. Halpern, E. V. Gotthelf, J. Reynolds +2
Following our discovery of radio pulsations from the newly recognized Anomalous X-ray Pulsar (AXP) 1E 1547.0-5408, we initiated X-ray monitoring with the Swift X-ray Telescope, and…
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 Eccentric Binary Millisecond Pulsar in NGC 1851
Paulo C. C. Freire, Scott M. Ransom, Yashwant Gupta
PSR J0514-4002A is a 5-ms pulsar is located in the globular cluster NGC 1851; it belongs to a highly eccentric (e = 0.888) binary system. It is one of the earliest known examples o…
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…
Twenty Years of Searching for (and Finding) Globular Cluster Pulsars
Scott M. Ransom
Globular clusters produce orders of magnitude more millisecond pulsars per unit mass than the Galactic disk. Since the first cluster pulsar was uncovered twenty years ago, at least…
The GBT350 Survey of the Northern Galactic Plane for Radio Pulsars and Transients
J. W. T. Hessels, S. M. Ransom, V. M. Kaspi +3
Using the Green Bank Telescope (GBT) and Pulsar Spigot at 350MHz, we have surveyed the Northern Galactic Plane for pulsars and radio transients. This survey covers roughly 1000 squ…
1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
F. Camilo, S. M. Ransom, J. P. Halpern +1
The variable X-ray source 1E 1547.0-5408 was identified by Gelfand & Gaensler (2007) as a likely magnetar in G327.24-0.13, an apparent supernova remnant. No X-ray pulsations have b…
A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters
J. W. T. Hessels, S. M. Ransom, I. H. Stairs +2
We have surveyed all 22 known Galactic globular clusters observable with the Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at ~1.4GHz. Data were taken wi…
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…
Predictions for Triple Stars with and without a Pulsar in Star Clusters
M. Trenti, S. Ransom, P. Hut +1
Though about 80 pulsar binaries have been detected in globular clusters so far, no pulsar has been found in a triple system in which all three objects are of comparable mass. Here…
Finding (or not) New Gamma-ray Pulsars with GLAST
Scott M. Ransom
Young energetic pulsars will likely be the largest class of Galactic sources observed by GLAST, with many hundreds detected. Many will be unknown as radio pulsars, making pulsation…
VLBA measurement of the transverse velocity of the magnetar XTE J1810-197
D. J. Helfand, S. Chatterjee, W. F. Brisken +5
We have obtained observations of the magnetar XTE J1810-197 with the Very Long Baseline Array at two epochs separated by 106 days, at wavelengths of 6 cm and 3.6 cm. Comparison of…
Timing the Eccentric Binary Millisecond Pulsar in NGC 1851
Paulo C. Freire, Scott M. Ransom, Yashwant Gupta
We have used the Green Bank Telescope to observe the millisecond pulsar PSR J0514-4002A on 43 occasions spread over 2 years. This 5-ms pulsar is located in the globular cluster NGC…
Polarized radio emission from the magnetar XTE J1810-197
F. Camilo, J. Reynolds, S. Johnston +3
We have used the Parkes radio telescope to study the polarized emission from the anomalous X-ray pulsar XTE J1810-197 at frequencies of 1.4, 3.2, and 8.4 GHz. We find that the puls…
The Unusual Binary Pulsar PSR J1744-3922: Radio Flux Variability, Near-infrared Observation and Evolution
R. P. Breton, M. S. E. Roberts, S. M. Ransom +4
PSR J1744-3922 is a binary pulsar exhibiting highly variable pulsed radio emission. We report on a statistical multi-frequency study of the pulsed radio flux variability which sugg…