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18 April 2024 |
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Multi-wavelength observations of serendipitous Chandra sources | | P. Gandhi
; C. S. Crawford
; A. C. Fabian
; R. J. Wilman
; R. M. Johnstone
; A. J. Barger
; L. L. Cowie
; | | Date: |
7 Jun 2001 | | Subject: | astro-ph | | Affiliation: | 1,2), R. M. Johnstone, A. J. Barger(3,4), L. L. Cowie (Univ. Of Cambridge, Leiden Observatory, IfA Hawaii, Univ. of Wisconsin-Madison | | Abstract: | We describe progress in a programme to study a sample of sources typical of those which contribute a large fraction of the hard X-ray background. The sources are selected from the fields of approximately 10 ks Chandra cluster observations with follow-up in the near-infrared and optical. The X-ray data indicate that many of these are powerful, obscured sources. Two hard objects which are lensed by the cluster are good candidates for X-ray type-2 quasars, with luminosities of the order 10^{44}-10^{45} erg s^{-1} and obscuring column densities of the order 10^{23} cm^{-2}. We find that the sources are bright in the infra-red (K typically 17-18). From Keck optical spectra and photometric redshifts, we find that the host galaxies are consistent with being early-type, massive hosts at redshifts ranging from 0.2 to 3, with median redshift approximately 1.5. The two obscured quasars also have mid-infrared detections and 850-micron upper-limits implying that the surrounding dust is at warm-to-hot temperatures (T of the order of 1000 K). | | Source: | arXiv, astro-ph/0106139 | | Services: | Forum | Review | PDF | Favorites | |
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