publication . Article . Preprint . 2015

1FGL J1417.7-4407: A likely gamma-ray bright binary with a massive neutron star and a giant secondary

Jay Strader; Laura Chomiuk; C. C. Cheung; David J. Sand; Davide Donato; Robin H. D. Corbet; Dana Koeppe; Philip G. Edwards; Jamie Stevens; Leonid Petrov; ...
Open Access English
  • Published: 24 Apr 2015
Abstract
We present multiwavelength observations of the persistent Fermi-LAT unidentified gamma-ray source 1FGL J1417.7-4407, showing it is likely to be associated with a newly discovered X-ray binary containing a massive neutron star (nearly 2 M_sun) and a ~ 0.35 M_sun giant secondary with a 5.4 day period. SOAR optical spectroscopy at a range of orbital phases reveals variable double-peaked H-alpha emission, consistent with the presence of an accretion disk. The lack of radio emission and evidence for a disk suggests the gamma-ray emission is unlikely to originate in a pulsar magnetosphere, but could instead be associated with a pulsar wind, relativistic jet, or could be due to synchrotron self-Compton at the disk--magnetosphere boundary. Assuming a wind or jet, the high ratio of gamma-ray to X-ray luminosity (~ 20) suggests efficient production of gamma-rays, perhaps due to the giant companion. The system appears to be a low-mass X-ray binary that has not yet completed the pulsar recycling process. This system is a good candidate to monitor for a future transition between accretion-powered and rotational-powered states, but in the context of a giant secondary.
Comment: ApJL in press
Sustainable Development Goals (SDG) [Beta]
Subjects
arXiv: Astrophysics::High Energy Astrophysical PhenomenaAstrophysics::Galaxy AstrophysicsAstrophysics::Solar and Stellar AstrophysicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astronomy and Astrophysics, Physics, Astrophysics, Synchrotron radiation, Context (language use), Magnetosphere, Pulsar, Luminosity, Stars, Neutron star, Gamma ray
Funded by
NSF| Programs on Critical Problems in Physics, Astrophysics and Biophysics at the Aspen Center for Physics
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1066293
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Physics
,
NSF| The Catalina Real-Time Transient Survey (CRTS)
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 0909182
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
,
NSF| Open Exploration of the Time Domain with the Catalina Real-Time Transient Survey
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1313422
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
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