ChaMPlane X-ray sources in the Galactic bulge Virtual Observatory Resource

Authors
  1. Koenig X.
  2. Grindlay J.E.
  3. van den Berg M.
  4. Laycock S.
  5. Zhao P.
  6. Hong J.,Schlegel E.M.
  7. Published by
    CDS
Abstract

We 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 <~2kpc). This number is in excess of predictions made with a simple CV model based on a local CV space density of <~10^-5^pc^-3^, and a scale height ~200pc. We discuss several possible reasons for this observed excess.

Keywords
  1. infrared-photometry
  2. visible-astronomy
  3. photometry
  4. stellar-spectral-types
  5. surveys
  6. x-ray-sources
  7. dwarf-stars
Bibliographic source Bibcode
2008ApJ...685..463K
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/685/463
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/685/463
Document Object Identifer DOI
doi:10.26093/cds/vizier.16850463

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History

2010-12-23T09:37:21Z
Resource record created
2010-12-23T09:37:21Z
Created
2016-11-25T08:10:38Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr