Investigating ChaMPlane X‐Ray Sources in the Galactic Bulge with Magellan LDSS2 Spectra
Grindlay, Jonathan E.
van den Berg, Maureen
Schlegel, Eric M.
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CitationKoenig, Xavier, Jonathan E. Grindlay, Maureen van den Berg, Silas Laycock, Ping Zhao, JaeSub Hong, and Eric M. Schlegel. 2008. “Investigating ChaMPlane X‐Ray Sources in the Galactic Bulge with Magellan LDSS2 Spectra.” The Astrophysical Journal 685 (1): 463–77. https://doi.org/10.1086/590206.
AbstractWe have carried out optical and X-ray spectral analyses on a sample of 136 candidate optical counterparts of X-ray sources found in five Galactic bulge fields included in our Chandra Multiwavelength Plane Survey. We use a combination of optical spectral fitting and quantile X-ray analysis to obtain the hydrogen column density toward each object, and a three-dimensional dust model of the Galaxy to estimate the most probable distance in each case. We present the discovery of a population of stellar coronal emission sources, likely consisting of pre-main-sequence, young main-sequence, and main-sequence stars, as well as a component of active binaries of RS CVn or BY Dra type. We identify one candidate quiescent low-mass X-ray binary with a subgiant companion; we note that this object may also be an RS CVn system. We report the discovery of three new X-ray-detected cataclysmic variables (CVs) in the direction of the Galactic center (at distances less than or similar to 2 kpc). This number is in excess of predictions made with a simple CV model based on a local CV space density of less than or similar to 10(-5) pc(-3), and a scale height similar to 200 pc. We discuss several possible reasons for this observed excess.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41399729
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