Discovery and Timing of Three Millisecond Pulsars in Radio and Gamma-Rays with the Giant Metrewave Radio Telescope and Fermi Large Area Telescope
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- Tata Inst. of Fundamental Research, Pune (India). National Center for Radio Astrophysics
- George Mason Univ., Fairfax, VA (United States)
- Naval Research Lab. (NRL), Washington, DC (United States)
- Max Planck Inst. für Radioastronomie, Bonn (Germany)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune (India)
- Univ. of Manchester (United Kingdom). Jodrell Bank Centre for Astrophysics
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
- Max Planck Inst. für Radioastronomie, Bonn (Germany); Indian Inst. of Technology, Kharagpur (India)
- Tata Inst. of Fundamental Research, Pune (India). National Center for Radio Astrophysics; Polish Academy of Sciences, Warsaw (Poland). Nicolaus Copernicus Astronomical Center
- Univ. Bordeaux, Gradignan (France). Centre d'Etudes Nucleaires de Bordeaux Gradignan, IN2P3/CNRS
- Univ. of California, Santa Cruz, CA (United States). Santa Cruz Inst. for Particle Physics; Univ. of Hong Kong (Hong Kong); Univ. of Hong Kong (Hong Kong). Lab. for Space Research
- National Radio Astronomy Observatory, Socorro, NM (United States)
- Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology, W.W. Hansen Experimental Physics Lab.; SLAC National Accelerator Lab., Menlo Park, CA (United States)
In this work, we performed deep observations to search for radio pulsations in the directions of 375 unassociated Fermi Large Area Telescope γ-ray sources using the Giant Metrewave Radio Telescope (GMRT) at 322 and 607 MHz. In this paper we report the discovery of three millisecond pulsars (MSPs), PSR J0248+4230, PSR J1207–5050, and PSR J1536–4948. We conducted follow-up timing observations for ~5 yr with the GMRT and derived phase-coherent timing models for these MSPs. PSR J0248+4230 and J1207–5050 are isolated MSPs having periodicities of 2.60 ms and 4.84 ms. PSR J1536–4948 is a 3.07 ms pulsar in a binary system with an orbital period of ~62 days about a companion of a minimum mass of 0.32 M⊙. We also present multifrequency pulse profiles of these MSPs from the GMRT observations. PSR J1536–4948 is an MSP with an extremely wide pulse profile having multiple components. Using the radio timing ephemeris we subsequently detected γ-ray pulsations from these three MSPs, confirming them as the sources powering the γ-ray emission. For PSR J1536–4948 we performed combined radio–γ-ray timing using ~11.6 yr of γ-ray pulse times of arrival (TOAs) along with the radio TOAs. PSR J1536–4948 also shows evidence for pulsed γ-ray emission out to above 25 GeV, confirming earlier associations of this MSP with a ≥10 GeV point source. The multiwavelength pulse profiles of all three MSPs offer challenges to models of radio and γ-ray emission in pulsar magnetospheres.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1781057
- Journal Information:
- The Astrophysical Journal, Vol. 910, Issue 2; ISSN 0004-637X
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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