期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 813, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/813/2/L26
关键词
binaries: spectroscopic; gamma-rays: general; pulsars: general; stars: individual (1FGL J1018.6-5856); X-rays: general
资金
- NASA [NNX15AU83G, DPR S-15633-Y]
- NASA [796745, NNX15AU83G] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien
- Division Of Physics [1430152] Funding Source: National Science Foundation
We present medium-resolution optical spectroscopy with the SOAR telescope of the O star secondary of the highmass gamma-ray binary 1FGL J1018.6-5856 to help determine whether the primary is a neutron star or black hole. We find that the secondary has a low radial velocity semi-amplitude of 11-12 km s(-1), with consistent values obtained for H and He absorption lines. This low value strongly favors a neutron star primary: while a black hole cannot be excluded if the system is close to face on, such inclinations are disallowed by the observed rotation of the secondary. We also find the high-energy (X-ray and gamma-ray) flux maxima occur when the star is behind the compact object along our line of sight, inconsistent with a simple model of anisotropic inverse Compton scattering for the gamma-ray photons.
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