The Galactic Plane at faint X-ray fluxes - I: Properties and characteristics of the X-ray source population

Details The Galactic Plane at faint X-ray fluxes - I: Properties and characteristics of the X-ray source population The Galactic Plane at faint X-ray fluxes - I: Properties and characteristics of the X-ray source population

2010-12-07

arxiv.org/abs/1012.1469v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

17 pages, 17 figures, accepted for publication in MNRAS

Scientific paper

We investigate the serendipitous X-ray source population revealed in XMM-Newton observations targeted in the Galactic Plane within the region 31510^{32} erg/s, whereas some will be extragalactic interlopers. >90% of the soft sources have potential NIR (2MASS and/or UKIDSS) counterparts inside their error circles, consistent with the dominant soft X-ray source population being relatively nearby coronally-active stars. These stellar counterparts are generally brighter than J=16, a brightness cutoff which corresponds to the saturation of the X-ray coronal emission at L_X=10^{-3} L_{bol}. In contrast, the success rate in finding likely IR counterparts to the hard X-ray sample is no more than ~15% down to J=16 and ~25% down to J=20, set against a rapidly rising chance coincidence rate. The make-up of the hard X-ray source population, in terms of the known classes of accreting and non-accreting systems, remains uncertain.

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