BeppoSAX serendipitous discovery of the X-ray pulsar SAX J1802.7-2017

Details BeppoSAX serendipitous discovery of the X-ray pulsar SAX J1802.7-2017 BeppoSAX serendipitous discovery of the X-ray pulsar SAX J1802.7-2017

2003-08-09

arxiv.org/abs/astro-ph/0308157v1

Astrophys.J.596:L63-L66,2003

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/379092

We report on the serendipitous discovery of a new X-ray source, SAX J1802.7-2017, ~22' away from the bright X-ray source GX 9+1, during a BeppoSAX observation of the latter source on 2001 September 16-20. SAX J1802.7-2017 remained undetected in the first 50 ks of observation; the source count rate in the following ~300 ks ranged between 0.04 c/s and 0.28 c/s, corresponding to an averaged 0.1-10 keV flux of 3.6 10^{-11} ergs cm^{-2} s^{-1}. We performed a timing analysis and found that SAX J1802.7-2017 has a pulse period of 139.612 s, a projected semimajor axis of a_x sin i ~ 70 lt-s, an orbital period of ~4.6 days, and a mass function f(M) ~ 17 Msun. The new source is thus an accreting X-ray pulsar in a (possibly eclipsing) high mass X-ray binary. The source was not detected by previous X-ray astronomy satellites, indicating that it is likely a transient system.

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