Journal Article

Deep <i>Chandra</i> observations of TeV binaries – II. LS 5039

N. Rea, D. F. Torres, G. A. Caliandro, D. Hadasch, M. van der Klis, P. G. Jonker, M. Méndez and A. Sierpowska-Bartosik

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 416, issue 2, pages 1514-1521
Published in print September 2011 | ISSN: 0035-8711
Published online September 2011 | e-ISSN: 1365-2966 | DOI:
Deep Chandra observations of TeV binaries – II. LS 5039

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We report on Chandra observations of the TeV-emitting high-mass X-ray binary LS 5039 , for a total exposure of ∼70 ks, using the ACIS-S camera in continuous clocking mode to search for a possible X-ray pulsar in this system. We did not find any periodic or quasi-periodic signal in the 0.3–0.4 and 0.75–0.9 orbital phases, and in a frequency range of 0.005–175 Hz. We derived an average pulsed fraction 3σ upper limit for the presence of a periodic signal of ≲15 per cent (depending on the frequency and the energy band), the deepest limit ever reached for this object. If the X-ray emission of LS 5039 is due (at least in part) to a rotational powered pulsar, the latter is either spinning faster than ∼5.6 ms, or having a beam pointing away from our line of sight, or contributing to ≲15 per cent of the total X-ray emission of the system in the orbital phases we observed.

Keywords: binaries: general; X-rays: binaries

Journal Article.  5703 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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