1FGL J0523.5–2529: A NEW PROBABLE GAMMA-RAY PULSAR BINARY
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States)
- Department of Physics, University of Adiyaman, 02040 Adiyaman (Turkey)
- Astro Space Center of the Lebedev Physical Institute, 117810 Moscow (Russian Federation)
- Department of Physics, Texas Tech University, Box 41051, Lubbock, TX 79409 (United States)
- Special Astrophysical Observatory, Russian Academy of Sciences, Karachaevo-Cherkesskaya Republic, Nizhnii Arkhyz 369167 (Russian Federation)
- Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
We report optical photometric and Southern Astrophysical Research spectroscopic observations of an X-ray source found within the localization error of the Fermi Large Area Telescope unidentified γ-ray source 1FGL J0523.5–2529. The optical data show periodic flux modulation and radial velocity variations indicative of a binary with a 16.5 hr period. The data suggest a massive non-degenerate secondary (≳ 0.8 M {sub ☉}), and we argue the source is likely a pulsar binary. The radial velocities have good phase coverage and show evidence for a measurable eccentricity (e = 0.04). There is no clear sign of irradiation of the secondary in either photometry or spectroscopy. The spatial location out of the Galactic plane and γ-ray luminosity of the source are more consistent with classification as a recycled millisecond pulsar than as a young pulsar. Future radio timing observations can confirm the identity of the primary and further characterize this interesting system.
- OSTI ID:
- 22365777
- Journal Information:
- Astrophysical Journal Letters, Vol. 788, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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