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Title: GMRT DISCOVERY OF PSR J1544+4937: AN ECLIPSING BLACK-WIDOW PULSAR IDENTIFIED WITH A FERMI-LAT SOURCE

Using the Giant Metrewave Radio Telescope, we performed deep observations to search for radio pulsations in the directions of unidentified Fermi-Large Area Telescope {gamma}-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the uncataloged {gamma}-ray source FERMI J1544.2+4941. This 2.16 ms pulsar is in a 2.9 hr compact circular orbit with a very low mass companion (M{sub c} > 0.017M{sub Sun }). 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.
Authors:
; ;  [1] ; ; ;  [2] ;  [3] ; ; ; ;  [4] ;  [5] ; ;  [6] ;  [7] ;  [8] ; ;  [9] ;  [10] ;  [11]
  1. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007 (India)
  2. Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352 (United States)
  3. Inter-University Centre for Astronomy and Astrophysics, Pune 411 007 (India)
  4. W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
  5. National Radio Astronomy Observatory (NRAO), Charlottesville, VA 22903 (United States)
  6. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  7. Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
  8. Laboratoire de Physique et Chimie de l'Environnement, LPCE UMR 6115 CNRS, F-45071 Orleans Cedex 02 (France)
  9. CSIRO Astronomy and Space Science, Australia Telescope National Facility, Epping, NSW 1710 (Australia)
  10. Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)
  11. Praxis Inc., Alexandria, VA 22303 (United States)
Publication Date:
OSTI Identifier:
22136604
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 773; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ECLIPSE; EMISSION; GAMMA RADIATION; MHZ RANGE; ORBITS; PULSARS; PULSATIONS; RADIO TELESCOPES