1FGL J0523.5-2529: A new probable gamma-ray pulsar binary

Jay Strader, Laura Chomiuk, Eda Sonbas, Kirill Sokolovsky, David J. Sand, Alexander S. Moskvitin, C. C. Cheung

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

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 ), 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.

Original languageEnglish (US)
Article numberL27
JournalAstrophysical Journal Letters
Volume788
Issue number2
DOIs
StatePublished - Jun 20 2014
Externally publishedYes

Keywords

  • binaries: spectroscopic
  • gamma rays: general
  • pulsars: general
  • X-rays: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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