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26 April 2024 |
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The Chandra Deep Survey of the Hubble Deep Field North Area. II. Results from the Caltech Faint Field Galaxy Redshift Survey Area | | A.E.Hornschemeier
; W.N.Brandt
; G.P.Garmire
; D.P.Schneider
; A.J.Barger
; P.S.Broos
; L.L.Cowie
; L.K.Townsley
; M.W.Bautz
; D.N.Burrows
; G.Chartas
; E.D.Feigelson
; R.Griffiths
; D.Lumb
; J.A.Nousek
; L.W.Ramsey
; W.L.W.Sargent
; | | Date: |
27 Dec 2000 | | Subject: | astro-ph | | Abstract: | We present results from a 221.9 ks Chandra exposure of the HDF-N and its vicinity, concentrating on the 8.6’ X 8.7’ area covered by the Caltech Faint Field Galaxy Redshift Survey (the `Caltech area’). The minimum detectable fluxes in the 0.5-2 keV and 2-8 keV bands are 1.3e-16 cgs and 6.5e-16 cgs, respectively and a total of 82 sources are detected. More than 80% of the extragalactic X-ray background in the 2-8 keV band is resolved. Redshifts are available for 96% of the sources with R<23; the redshift range is 0.1-3.5 with most sources having z < 1.5. Eight of the X-ray sources are located in the HDF-N itself, including two not previously reported. A population of X-ray faint, optically bright, nearby galaxies emerges at soft-band fluxes of ~< 3e-16 cgs. We set the tightest constraints to date on the X-ray emission properties of microJy radio sources, mid-infrared sources detected by ISO, and very red (R-K_s > 5.0) objects. Where both the infrared and the X-ray coverage are deepest, 75% of the X-ray sources are detected by ISO; the high X-ray to infrared matching rate bodes well for future sensitive infrared observations of faint X-ray sources. Four of the 33 very red objects that have been identified in the Caltech area by Hogg et al. (2000) are detected in X-rays; these four are among our hardest Chandra sources, and we argue that they contain moderately luminous obscured AGN. Overall, however, the small Chandra detection fraction suggests a relatively small AGN content in the optically selected very red object population. (Abridged) | | Source: | arXiv, astro-ph/0101494 | | Services: | Forum | Review | PDF | Favorites | |
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