ChaMPlane II: Near-Infrared Survey of Highly Extincted Regions along the Galactic Plane

Details ChaMPlane II: Near-Infrared Survey of Highly Extincted Regions along the Galactic Plane ChaMPlane II: Near-Infrared Survey of Highly Extincted Regions along the Galactic Plane

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4315s&link_type=abstract

American Astronomical Society, HEAD meeting #11, #43.15; Bulletin of the American Astronomical Society, Vol. 41, p.734

Astronomy and Astrophysics

Astronomy

Scientific paper

The Chandra Multiwavelength Plane (ChaMPlane) survey is designed to identify the low luminosity accreting sources in the Galaxy (e.g. quiescent low mass X-ray binaries, cataclysmic variables...) in order to study their nature and their distribution. We first used archival and allocated Chandra X-ray observations along the plane (+/- 12 degree in latitude) and performed an optical follow-up of 74 fields with NOAO facilities. In a second phase (ChaMPlane II, from 2007 to 2009), a near-infrared (J, H and K bands) survey has been performed using ISPI at the CTIO Blanco 4m telescope. This survey covers 18 ChaMPlane fields with a limiting K magnitude of 18.
I will discuss the nature of the X-ray sources based on their X-ray to infrared flux ratio, their infrared colors, and the possible distance of the source. As the near-infrared emission is less absorbed than the optical emission, this survey allows us to detect more distant sources, i.e. sources closer to the Galactic Bulge. We estimated the distance of the near-infrared counterparts to the X-ray sources using a model of dust distribution in the Galactic Plane. Most of the X-ray sources seem to be associated with foreground stars, but a fraction of hard, highly extincted sources could be associated with the Galactic population of low luminosity accreting binaries.

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