The discovery of very red counterparts to faint X-ray sources

Details The discovery of very red counterparts to faint X-ray sources The discovery of very red counterparts to faint X-ray sources

1997-08-25

arxiv.org/abs/astro-ph/9708227v1

Astronomy and Astrophysics

Astrophysics

7 pages, LaTeX, 7 figures (1 postscript file each). Uses mn.sty and epsf.sty. Accepted by MNRAS. For more information see ht

Scientific paper

We present deep K-band imaging at the positions of four very faint X-ray sources found in the UK ROSAT Deep Survey to have no optical counterpart brighter than R~23. Likely identifications are found within the ROSAT error circle in all four fields with R-K colours of between 3.2 +/- 0.4 and 6.4 +/- 0.6. From a consideration of the R-K colours and X-ray to optical luminosity ratios of the candidate identifications, we tentatively classify two of the X-ray sources as very distant (z ~ 1) clusters of galaxies, one as a narrow emission line galaxy and one as an obscured QSO.

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