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Source Contamination in X-ray Studies of Star-forming Regions: Application to the Chandra Carina Complex Project

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.
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Submitted on : Tuesday, April 19, 2022 - 4:25:52 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:04 AM

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Konstantin V. Getman, Patrick S. Broos, Eric D. Feigelson, Leisa K. Townsley, Matthew S. Povich, et al.. Source Contamination in X-ray Studies of Star-forming Regions: Application to the Chandra Carina Complex Project. The Astrophysical Journal Supplement, 2011, 194, ⟨10.1088/0067-0049/194/1/3⟩. ⟨insu-03645991⟩

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