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Title:
Comparison of 3.6-8.0 μm Spitzer/IRAC Galactic Center Survey Point Sources with Chandra X-Ray Point Sources in the Central 40 × 40 Parsecs
Authors:
Arendt, R. G.; Gezari, D. Y.; Stolovy, S. R.; Sellgren, K.; Smith, R.; Ramírez, S. V.; Yusef-Zadeh, F.; Law, C. J.; Smith, H. A.; Cotera, A. S.; Moseley, S. H.
Affiliation:
AA(CRESST/UMBC/GSFC, Code 665, NASA/Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771; .; Science Systems and Applications, Inc.), AB(NASA/Goddard Space Flight Center, Code 667, 8800 Greenbelt Road, Greenbelt, MD 20771.), AC(Spitzer Science Center, California Institute of Technology, Mail Code 220-6, 1200 East California Boulevard, Pasadena, CA 91125.), AD(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH, 43210.), AE(NASA/Goddard Space Flight Center, Code 662, 8800 Greenbelt Road, Greenbelt, MD 20771.), AF(IPAC, California Institute of Technology, Mail Code 100-22, 1200 East California Boulevard, Pasadena, CA 91125.), AG(Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208.), AH(Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208.; Current Address: Sterrenkundig Instituut ``Anton Pannekoek,'' Universiteit van Amsterdam.), AI(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AJ(SETI Institute, 515 North Whisman Road, Mountain View, CA 94043.), AK(NASA/Goddard Space Flight Center, Code 665, 8800 Greenbelt Road, Greenbelt, MD 20771.)
Publication:
The Astrophysical Journal, Volume 685, Issue 2, pp. 958-970. (ApJ Homepage)
Publication Date:
10/2008
Origin:
UCP
ApJ Keywords:
Galaxy: Center, Infrared: Stars, X-Rays: Binaries
DOI:
10.1086/591015
Bibliographic Code:
2008ApJ...685..958A

Abstract

We have studied the correlation between 2357 Chandra X-ray point sources in a 40×40 pc field and ~20,000 infrared sources we observed in the corresponding subset of our 2deg×1.4deg Spitzer/IRAC Galactic Center Survey at 3.6-8.0 μm, using various spatial and X-ray hardness thresholds. The correlation was determined for source separations of less than 0.5", 1", or 2". Only the soft X-ray sources show any correlation with infrared point sources on these scales, and that correlation is very weak. The upper limit on hard X-ray sources that have infrared counterparts is <1.7% (3 σ). However, because of the confusion limit of the IR catalog, we only detect IR sources with absolute magnitudes <~1. As a result, a stronger correlation with fainter sources cannot be ruled out. Only one compact IR source, IRS 13, coincides with any of the dozen prominent X-ray emission features in the 3×3 pc region centered on Sgr A*, and the diffuse X-ray and IR emission around Sgr A* seems to be anticorrelated on a few-arcsecond scale. We compare our results with previous identifications of near-infrared companions to Chandra X-ray sources.
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