Showing papers by "K. S. Wood published in 2013"
Tata Institute of Fundamental Research1, United States Naval Research Laboratory2, Inter-University Centre for Astronomy and Astrophysics3, SLAC National Accelerator Laboratory4, National Radio Astronomy Observatory5, Goddard Space Flight Center6, Columbia University7, Arecibo Observatory8, Centre national de la recherche scientifique9, Australia Telescope National Facility10, Santa Cruz Institute for Particle Physics11, Praxis12
TL;DR: In this paper, the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J 1544.2+4941.
Abstract: Using the Giant Metrewave Radio Telescope (GMRT) we performed deep observations to search for radio pulsations in the directions of unidentified Fermi Large Area Telescope (LAT) gamma-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J1544.2+4941. This 2.16 ms pulsar is in a 2.9 hours compact circular orbit with a very low-mass companion (Mc > 0.017 Msun). At 322 MHz this pulsar is found to be eclipsing for 13% of its orbit, whereas at 607 MHz the pulsar is detected throughout the low-frequency eclipse phase. Variations in the eclipse ingress phase are observed, indicating a clumpy and variable eclipsing medium. Moreover, additional short-duration absorption events are observed around the eclipse boundaries. Using the radio timing ephemeris we were able to detect gamma-ray pulsations from this pulsar, confirming it as the source powering the gamma-ray emission.
69 citations
United States Naval Research Laboratory1, National Radio Astronomy Observatory2, National Academy of Sciences3, INAF4, Centre national de la recherche scientifique5, Columbia University6, Arecibo Observatory7, Inter-University Centre for Astronomy and Astrophysics8, Tata Institute of Fundamental Research9, SLAC National Accelerator Laboratory10, Goddard Space Flight Center11, Max Planck Society12, Australia Telescope National Facility13, University of Manchester14, Santa Cruz Institute for Particle Physics15
TL;DR: In this article, the first millisecond pulsar was discovered in a blind search of Fermi Large Area Telescope (LAT) gamma-ray data using the Green Bank Telescope (GBT).
Abstract: We report the detection of radio emission from PSR J1311-3430, the first millisecond pulsar discovered in a blind search of Fermi Large Area Telescope (LAT) gamma-ray data. We detected radio pulsations at 2 GHz, visible for <10% of ~4.5-hrs of observations using the Green Bank Telescope (GBT). Observations at 5 GHz with the GBT and at several lower frequencies with Parkes, Nancay, and the Giant Metrewave Radio Telescope resulted in non-detections. We also report the faint detection of a steep spectrum continuum radio source (0.1 mJy at 5 GHz) in interferometric imaging observations with the Jansky Very Large Array. These detections demonstrate that PSR J1311-3430, is not radio quiet and provides additional evidence that the radio beaming fraction of millisecond pulsars is very large. The radio detection yields a distance estimate of 1.4 kpc for the system, yielding a gamma-ray efficiency of 30%, typical of LAT-detected MSPs. We see apparent excess delay in the radio pulsar as the pulsar appears from eclipse and we speculate on possible mechanisms for the non-detections of the pulse at other orbital phases and observing frequencies.
47 citations
Tata Institute of Fundamental Research1, United States Naval Research Laboratory2, Inter-University Centre for Astronomy and Astrophysics3, SLAC National Accelerator Laboratory4, National Radio Astronomy Observatory5, Goddard Space Flight Center6, Arecibo Observatory7, Columbia University8, Centre national de la recherche scientifique9, Australia Telescope National Facility10, Santa Cruz Institute for Particle Physics11, Praxis12
TL;DR: In this paper, the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J 1544.2+4941.
Abstract: Using the Giant Metrewave Radio Telescope (GMRT) we performed deep observations to search for radio pulsations in the directions of unidentified Fermi Large Area Telescope (LAT) gamma-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the un-cataloged gamma-ray source Fermi J1544.2+4941. This 2.16 ms pulsar is in a 2.9 hours compact circular orbit with a very low-mass companion (Mc > 0.017 Msun). At 322 MHz this pulsar is found to be eclipsing for 13% of its orbit, whereas at 607 MHz the pulsar is detected throughout the low-frequency eclipse phase. Variations in the eclipse ingress phase are observed, indicating a clumpy and variable eclipsing medium. Moreover, additional short-duration absorption events are observed around the eclipse boundaries. Using the radio timing ephemeris we were able to detect gamma-ray pulsations from this pulsar, confirming it as the source powering the gamma-ray emission.