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The Millisecond Pulsars in NGC 6760
Paulo C. C. Freire, Jason W. T. Hessels, David J. Nice +3
We present the results of recent Arecibo and Green Bank observations of the globular cluster NGC 6760. Using Arecibo, a phase-coherent timing solution has been obtained for the pre…
An XTE Archival Search for Coherent X-ray Pulsations in LMXB 4U 1820-30
Rim Dib, Scott M. Ransom, Paul S. Ray +2
As part of a large-scale search for coherent pulsations from LMXBs in the RXTE archive, we have completed a detailed series of searches for coherent pulsations of 4U 1820-30 -- an…
Orbital Modulation of the Apparent Dispersion Measure Towards PSR J0737-3039A
Scott M. Ransom, Donald C. Backer, Paul Demorest +4
This paper has been withdrawn from astro-ph and from the submission process to ApJ Letters since the variations "observed" are not real. As pointed out to me first by Willem van St…
The geometry of the double-pulsar system J0737-3039 from systematic intensity variations
Fredrick A. Jenet, Scott M. Ransom
The recent discovery of J0737-3039A & B-two pulsars in a highly relativistic orbit around one another - offers an unprecedented opportunity to study the elusive physics of pulsar r…
Fluctuation and morphological properties of the pulsars in J0737--3039 system
R. Ramachandran, D. C. Backer, P. Demorest +2
We describe the morphological and fluctuation properties of the pulsars in the double neutron star system, PSR J0737--3039. Pulsar B is seen in almost all orbital phases, except in…
GBT Exploratory Time Observations of the Double-Pulsar System PSR J0737-3039
S. Ransom, P. Demorest, V. Kaspi +2
We report results from Exploratory Time observations of the double-pulsar system PSR J0737-3039 using the Green Bank Telescope (GBT). The large gain of the GBT, the diversity of th…
X-ray, Radio, and Optical Observations of the Putative Pulsar in the Supernova Remnant CTA 1
J. P. Halpern, E. V. Gotthelf, F. Camilo +2
A Chandra image of the central X-ray source RX J0007.0+7303 in the supernova remnant CTA 1 reveals a point source, a compact nebula, and a bent jet, all of which are characteristic…
A 20-cm Survey for Pulsars in Globular Clusters using the GBT and Arecibo
Scott Ransom, Jason Hessels, Ingrid Stairs +3
We have been conducting deep searches at ~20 cm of >30 globular clusters (GCs) using the 305-m Arecibo telescope in Puerto Rico and the 100-m Green Bank telescope (GBT) in West Vir…
Three New Binary Pulsars Discovered With Parkes
Jason Hessels, Scott Ransom, Mallory Roberts +4
We present three new binary pulsars discovered during a search for pulsations in 56 unidentified mid-latitude EGRET gamma-ray error boxes with the Parkes multibeam receiver. Timing…
Green Bank Telescope Measurement of the Systemic Velocity of the Double Pulsar Binary J0737-3039 and Implications for its Formation
S. M. Ransom, V. M. Kaspi, R. Ramachandran +5
We report on the measurement at 820- and 1400-MHz of orbital modulation of the diffractive scintillation timescale from pulsar A in the double-pulsar system J0737-3039 using the Gr…
The PSR J0514-4002A binary system in NGC 1851
P. C. C. Freire, Y. Gupta, S. M. Ransom +1
Using the Giant Metrewave Radio Telescope (GMRT), we have discovered PSR J0514-4002A, a binary millisecond pulsar in the globular cluster NGC 1851. This pulsar has a rotational per…
Observations of PSR J2021+3651 and its X-ray Pulsar Wind Nebula G75.2+0.1
J. W. T. Hessels, M. S. E. Roberts, S. M. Ransom +5
We present results from X-ray and radio observations of the recently discovered young Vela-like pulsar PSR J2021+3651, which is coincident with the EGRET gamma-ray source GeV 2020+…
GMRT Discovery of A Millisecond Pulsar in a Very Eccentric Binary System
Paulo C. Freire, Yashwant Gupta, Scott M. Ransom +1
We report the discovery of the binary millisecond pulsar J0514-4002A, which is the first known pulsar in the globular cluster NGC 1851 and the first pulsar discovered using the Gia…
PSR J2021+3651: A New Gamma-Ray Pulsar Candidate
Mallory S. E. Roberts, Jason W. T. Hessels, Scott M. Ransom +4
The COS B high energy gamma-ray source 2CG 075+00, also known as GeV J2020+3658 or 3EG J2021+3716, has avoided identification with a low energy counterpart for over twenty years. W…
A 20 cm Search for Pulsars in Globular Clusters with Arecibo and the GBT
Jason W. T. Hessels, Scott M. Ransom, Ingrid H. Stairs +4
We are conducting deep searches for radio pulsations at L-band (~ 20cm) towards more than 30 globular clusters using the 305m Arecibo telescope in Puerto Rico and the 100m Green Ba…
Orientations of Spin and Magnetic Dipole Axes of Pulsars in the J0737--3039 Binary Based on Polarimetry Observations at the Green Bank Telescope
P. Demorest, R. Ramachandran, D. C. Backer +4
We report here the first polarimetric measurements of the pulsars in the J0737-3039 binary neutron star system using the Green Bank Telescope. We conclude both that the primary sta…
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…
New Pulsars Coincident With Unidentified Gamma-Ray Sources
Mallory S. E. Roberts, Scott M. Ransom, Jason Hessels +4
We present the results of radio searches for pulsars within unidentified EGRET source error boxes. Using the Parkes multibeam system, we have surveyed 56 sources at Galactic latitu…
The Pulsed Spectra of Two Extraordinary Pulsars
Mallory S. E. Roberts, Scott M. Ransom, Fotis Gavriil +5
We report on X-ray monitoring of two isolated pulsars within the same RXTE field of view. PSR J1811-1925 in the young supernova remnant G11.2-0.3 has a nearly sinusoidal pulse prof…
Green Bank Telescope Observations of the Eclipse of Pulsar "A" in the Double Pulsar Binary PSR J0737-3039
V. M. Kaspi, S. M. Ransom, D. C. Backer +4
We report on the first Green Bank Telescope observations at 427, 820 and 1400 MHz of the newly discovered, highly inclined and relativistic double pulsar binary. We focus on the br…