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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…
Multi-telescope timing of PSR J1518+4904
G. H. Janssen, B. W. Stappers, M. Kramer +5
PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, an…
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…
Observed luminosity difference between isolated and binary MSPs
A. N. Lommen, R. A. Kipphorn, D. J. Nice +3
We perform a brief census of velocities of isolated versus binary millisecond pulsars. We find the velocities of the two populations are indistinguishable. However, the scale heigh…
Arecibo and the ALFA Pulsar Survey
J. van Leeuwen, J. M. Cordes, D. R. Lorimer +34
The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ~1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive…
The Parallax and Proper Motion of PSR J0030+0451
Andrea N. Lommen, Richard A. Kipphorn, David J. Nice +3
We report the parallax and proper motion of millisecond pulsar J0030+0451, one of thirteen known isolated millisecond pulsars in the disk of the Galaxy. We obtained more than 6 yea…
The young, highly relativistic binary pulsar J1906+0746
D. R. Lorimer, I. H. Stairs, P. C. C. Freire +33
We report the discovery of PSR J1906+0746, a young 144-ms pulsar in a highly relativistic 3.98-hr orbit with an eccentricity of 0.085 and expected gravitational wave coalescence ti…
Arecibo Pulsar Survey Using ALFA. I. Survey Strategy and First Discoveries
J. M. Cordes, P. C. C. Freire, D. R. Lorimer +21
We report results from the initial stage of a long-term pulsar survey of the Galactic plane using the Arecibo L-band Feed Array (ALFA), a seven-beam receiver operating at 1.4 GHz w…
A 2.1 Solar Mass Pulsar Measured by Relativistic Orbital Decay
David J. Nice, Eric M. Splaver, Ingrid H. Stairs +4
PSR J0751+1807 is a millisecond pulsar in a circular 6 hr binary system with a helium white dwarf secondary. Through high precision pulse timing measurements with the Arecibo and E…
GBT Observations of Very Low Mass Binary Millisecond Pulsars: A Search for Eclipses
David J. Nice, Ingrid H. Stairs, Zaven Arzoumanian
We searched for eclipses of two millisecond pulsars, PSR J1807-2459 and PSR B1908+00. These pulsars are in very low mass binary systems with orbital parameters similar to those of…
Arecibo Measurements of Pulsar--White Dwarf Binaries: Evidence for Heavy Neutron Stars
David J. Nice, Eric M. Splaver, Ingrid H. Stairs
We summarize constraints on neutron star masses from ongoing timing observations of pulsar-white dwarf binaries at Arecibo. The trend is toward pulsar masses larger than the canoni…
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…
Masses, Parallax, and Relativistic Timing of the PSR J1713+0747 Binary System
Eric M. Splaver, David J. Nice, Ingrid H. Stairs +2
We report on 12 years of observations of PSR J1713+0747, a pulsar in a 68-day orbit with a white dwarf. Pulse times of arrival were measured with uncertainties as small as 200 ns.…
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…
Heavy Neutron Stars? A Status Report on Arecibo Timing of Four Pulsar-White Dwarf Systems
David J. Nice, Eric M. Splaver, Ingrid H. Stairs
Relativistic phenomena (orbital precession, Shapiro delay, and/or orbital decay) have been measured in Arecibo timing observations of four pulsar-white dwarf binaries, leading to c…
Neutron Star Masses from Arecibo Timing Observations of Five Pulsar-White Dwarf Binary Systems
David J. Nice, Eric M. Splaver, Ingrid H. Stairs
We have detected relativistic and/or kinematic post-Keplerian parameters of no fewer than five pulsar-white dwarf binary systems in long-term timing observations at Arecibo. We dis…
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…
On the Mass and Inclination of the PSR J2019+2425 Binary System
David J. Nice, Eric M. Splaver, Ingrid H. Stairs
We report on nine years of timing observations of PSR J2019+2425, a millisecond pulsar in a wide 76.5 day orbit with a white dwarf. We measure a significant change over time of the…
A Baseband Recorder for Radio Pulsar Observations
I. H. Stairs, E. M. Splaver, S. E. Thorsett +2
Digital signal recorders are becoming widely used in several subfields of centimetre-wavelength radio astronomy. We review the benefits and design considerations of such systems an…
Binary Eclipsing Millisecond Pulsars: A Decade of Timing
David Nice, Zaven Arzoumanian, Stephen Thorsett
We present results of long-term timing of eclipsing binaries PSR B1744-24A and PSR B1957+20 at Arecibo, the VLA, and Green Bank. Both pulsars exhibit irregularities in pulsar rotat…
Recent Arecibo Timing of the Relativistic Binary PSR B1534+12
I. H. Stairs, D. J. Nice, S. E. Thorsett +1
We present a new timing solution for PSR B1534+12, based on coherently-dedispersed observations at Jodrell Bank and, recently, Arecibo. The new data have resulted in improved measu…
Profile instabilities of the millisecond pulsar PSR J1022+1001
M. Kramer, K. M. Xilouris, F. Camilo +6
We present evidence that the integrated profiles of some millisecond pulsars exhibit severe changes that are inconsistent with the moding phenomenon as known from slowly rotating p…
Radio Pulses along the Galactic Plane
D. J. Nice
We have surveyed 68 deg^2 along the Galactic Plane for single, dispersed radio pulses. Each of 3027 independent pointings was observed for 68 s using the Arecibo telescope at 430 M…