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26 April 2024

» arxiv » 1502.5999

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1FGL J1417.7-4407: A 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 Corbet ; Dana Koeppe ; Philip G. Edwards ; Jamie Stevens ; Leonid Petrov ; Ricardo Salinas ; Mark Peacock ; Thomas Finzell ; Daniel Reichart ; Joshua Haislip ;
Date:	20 Feb 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 ~ 0.4 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.
Source:	arXiv, 1502.5999
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