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The Nature of an Unidentified X-ray Source in the 7 Ms Chandra Deep Field-South Catalog

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arxiv 2508.03656 v1 pith:376HJHGD submitted 2025-08-05 astro-ph.GA

The Nature of an Unidentified X-ray Source in the 7 Ms Chandra Deep Field-South Catalog

classification astro-ph.GA
keywords sourcecatalogchandracounterpartsdeepfield-southx-rayactive
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the 7 Ms Chandra Deep Field-South catalog, only one source, XID 912, was highly significantly detected in X-rays but had no formally reported counterparts in the UV, optical, infrared, or radio bands. We identified its potential JWST and VLT VIMOS counterparts and measured the corresponding aperture photometry to construct its spectral energy distribution (SED). We fitted this SED using CIGALE. The results indicate that the source is most likely an off-nuclear ultraluminous X-ray source, rather than a background active galactic nucleus.

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