Source contamination in X-ray studies of star-forming regions: Application to the Chandra Carina Complex Project

Konstantin V. Getman, Patrick S. Broos, Eric D. Feigelson, Leisa K. Townsley, Matthew S. Povich, Gordon P. Garmire, Thierry Montmerle, Yoshinori Yonekura, Yasuo Fukui

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26 Scopus citations

Abstract

We describe detailed simulations of X-ray-emitting populations to evaluate the levels of contamination by both Galactic and extragalactic X-ray sources unrelated to a star-forming region under study. For Galactic contaminations, we consider contribution from main-sequence stars and giants (not including cataclysmic variables and other classes of accretion-driven X-ray binary systems), as they make the dominant contribution at the position of the Carina Nebula. The simulations take into consideration a variety of technical factors involving a Galactic population synthesis model, stellar X-ray luminosity functions, Chandra telescope response, source detection methodology, and possible spatial variations in the X-ray background and absorption through molecular clouds. When applied to the 1.42 deg2 field of the Chandra Carina Complex Project (CCCP), the simulations predict 5000 contaminating sources (1 source arcmin-2 of the survey), evenly distributed across the field. The results of the simulations are further employed in a companion CCCP study to assign membership probabilities to individual sources.

Original languageEnglish (US)
Article number3
JournalAstrophysical Journal, Supplement Series
Volume194
Issue number1
DOIs
StatePublished - May 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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