- 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
- Astrophysical Journal
- Volume | Issue number
- 685 | 2
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
We have studied the correlation between 2357 Chandra X-ray point sources in a 40 x 40 pc field and similar to 20,000 infrared sources we observed in the corresponding subset of our 2 degrees x 1.4 degrees Spitzer/IRAC Galactic Center Survey at 3.6-8.0 mu m, 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 sigma). However, because of the confusion limit of the IR catalog, we only detect IR sources with absolute magnitudes less than or similar to 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 x 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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