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2025RNAAS...9..204S - Research Notes of the AAS, 9, 204 (2025/July-0)

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

SULLIVAN Q.P., YU Z., BRANDT W.N., LUO B. and ZOU F.

Abstract (from CDS):

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 Very Large Telescope 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.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Active galactic nuclei - Ultraluminous x-ray sources

Simbad objects: 3

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