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24 April 2024 |
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The Chandra Deep Field North Survey. IX. Extended X-ray Sources | | F.E. Bauer
; D.M. Alexander
; W.N. Brandt
; A.E. Hornschemeier
; T.Miyaji
; G.P. Garmire
; D. P. Schneider
; M.W. Bautz
; G. Chartas
; R.E. Griffiths
; & W.L.W. Sargent
; | | Date: |
30 Nov 2001 | | Subject: | astro-ph | | Affiliation: | PSU), D.M. Alexander (PSU), W.N. Brandt (PSU), A.E. Hornschemeier (PSU), T.Miyaji (CMU), G.P. Garmire (PSU), D. P. Schneider (PSU), M.W. Bautz (MIT), G. Chartas (PSU), R.E. Griffiths (CMU), & W.L.W. Sargent (Caltech | | Abstract: | The ~1 Ms Chandra Deep Field North observation is used to study the extended X-ray sources in the region surrounding the Hubble Deep Field North (HDF-N), yielding the most sensitive probe of extended X-ray emission at cosmological distances to date. A total of six such sources are detected, the majority of which align with small numbers of optically bright galaxies. Their angular sizes, band ratios, and X-ray luminosities -- assuming they lie at the same distances as the galaxies coincident with the X-ray emission -- are generally consistent with the properties found for nearby groups of galaxies. One source is notably different and is likely to be a poor-to-moderate X-ray cluster at high redshift (i.e., z > 0.7). We are also able to place strong constraints on the optically detected cluster of galaxies ClG 1236+6215 at z=0.85 and the wide-angle-tail radio galaxy VLA J123725.7+621128 at z~1-2. With rest-frame 0.5--2.0 keV X-ray luminosities of <(3-15)e42 ergs s^{-1}, the environments of both sources are either likely to have a significant deficit of hot intra-cluster gas compared to local clusters of galaxies, or they are X-ray groups. We find the surface density of extended X-ray sources in this observation to be 167 (+97,-67) deg^{-2} at a limiting soft-band flux of approximately 3e-16 ergs s^{-1} cm^{-2}. No evolution in the X-ray luminosity function of clusters is needed to explain this value. (Abridged) | | Source: | arXiv, astro-ph/0112002 | | Services: | Forum | Review | PDF | Favorites | |
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