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

Research output: Contribution to journalArticle

25 Citations (Scopus)

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 1 2011

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contamination
stars
x rays
simulation
stellar models
cataclysmic variables
main sequence stars
nebulae
molecular clouds
spatial variation
accretion
luminosity
project
telescopes
methodology
synthesis

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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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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Source contamination in X-ray studies of star-forming regions : Application to the Chandra Carina Complex Project. / Getman, Konstantin V.; Broos, Patrick S.; Feigelson, Eric D.; Townsley, Leisa K.; Povich, Matthew S.; Garmire, Gordon P.; Montmerle, Thierry; Yonekura, Yoshinori; Fukui, Yasuo.

In: Astrophysical Journal, Supplement Series, Vol. 194, No. 1, 3, 01.05.2011.

Research output: Contribution to journalArticle

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AU - Getman, Konstantin V.

AU - Broos, Patrick S.

AU - Feigelson, Eric D.

AU - Townsley, Leisa K.

AU - Povich, Matthew S.

AU - Garmire, Gordon P.

AU - Montmerle, Thierry

AU - Yonekura, Yoshinori

AU - Fukui, Yasuo

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