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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 γ-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the uncataloged γ-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 (Mc > 0.017M ⊙). 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. Finally, using the radio timing ephemeris we were able to detect γ-ray pulsations from this pulsar, confirming it as the source powering the γ-ray emission.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [2] ;  [7] ;  [8] ;  [6] ;  [4] ;  [9] ;  [9] ;  [4] ;  [4] ;  [10] ;  [11] ;  [2]
  1. Tata Institute of Fundamental Research, Pune (India)
  2. Naval Research Lab., Washington, D.C. (United States)
  3. Inter-Univ. Centre for Astronomy and Astrophysics, Pune (India)
  4. Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
  5. National Radio Astronomy Observatory (NRAO), Charlottesville, VA (United States)
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  7. Columbia Univ., New York, NY (United States); Arecibo Observatory, Arecibo, Puerto Rico (United States)
  8. Lab. de Physique et Chimie de l'Environnement, Orleans Cedex (France); Observatoire de Paris, Nancay (France)
  9. Australia Telescope National Facility, Epping, NSW (Australia)
  10. Univ. of California, Santa Cruz, CA (United States)
  11. Praxis Inc., Alexandria, VA (United States); Naval Research Lab., Washington, D. C. (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 773; Journal Issue: 1; Journal ID: ISSN 2041-8205
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; binaries: eclipsing; pulsars: general; pulsars: individual (PSR J1544+4937)
OSTI Identifier:
1356569

Bhattacharyya, B., Roy, J., Ray, P. S., Gupta, Y., Bhattacharya, D., Romani, R. W., Ransom, S. M., Ferrara, E. C., Wolff, M. T., Camilo, F., Cognard, I., Harding, A. K., den Hartog, P. R., Johnston, S., Keith, M., Kerr, M., Michelson, P. F., Saz Parkinson, P. M., Wood, D. L., and Wood, K. S.. GMRT discovery of PSR J1544+4937: An eclipsing black-widow pulsar identified with a Fermi-LAT source. United States: N. p., Web. doi:10.1088/2041-8205/773/1/L12.
Bhattacharyya, B., Roy, J., Ray, P. S., Gupta, Y., Bhattacharya, D., Romani, R. W., Ransom, S. M., Ferrara, E. C., Wolff, M. T., Camilo, F., Cognard, I., Harding, A. K., den Hartog, P. R., Johnston, S., Keith, M., Kerr, M., Michelson, P. F., Saz Parkinson, P. M., Wood, D. L., & Wood, K. S.. GMRT discovery of PSR J1544+4937: An eclipsing black-widow pulsar identified with a Fermi-LAT source. United States. doi:10.1088/2041-8205/773/1/L12.
Bhattacharyya, B., Roy, J., Ray, P. S., Gupta, Y., Bhattacharya, D., Romani, R. W., Ransom, S. M., Ferrara, E. C., Wolff, M. T., Camilo, F., Cognard, I., Harding, A. K., den Hartog, P. R., Johnston, S., Keith, M., Kerr, M., Michelson, P. F., Saz Parkinson, P. M., Wood, D. L., and Wood, K. S.. 2013. "GMRT discovery of PSR J1544+4937: An eclipsing black-widow pulsar identified with a Fermi-LAT source". United States. doi:10.1088/2041-8205/773/1/L12. https://www.osti.gov/servlets/purl/1356569.
@article{osti_1356569,
title = {GMRT discovery of PSR J1544+4937: An eclipsing black-widow pulsar identified with a Fermi-LAT source},
author = {Bhattacharyya, B. and Roy, J. and Ray, P. S. and Gupta, Y. and Bhattacharya, D. and Romani, R. W. and Ransom, S. M. and Ferrara, E. C. and Wolff, M. T. and Camilo, F. and Cognard, I. and Harding, A. K. and den Hartog, P. R. and Johnston, S. and Keith, M. and Kerr, M. and Michelson, P. F. and Saz Parkinson, P. M. and Wood, D. L. and Wood, K. S.},
abstractNote = {Using the Giant Metrewave Radio Telescope, we performed deep observations to search for radio pulsations in the directions of unidentified Fermi-Large Area Telescope γ-ray sources. We report the discovery of an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with the uncataloged γ-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 (Mc > 0.017M ⊙). 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. Finally, using the radio timing ephemeris we were able to detect γ-ray pulsations from this pulsar, confirming it as the source powering the γ-ray emission.},
doi = {10.1088/2041-8205/773/1/L12},
journal = {Astrophysical Journal Letters},
number = 1,
volume = 773,
place = {United States},
year = {2013},
month = {7}
}