P. Gandhi
Multi-wavelength observations of serendipitous Chandra sources
Gandhi, P.; Crawford, C.S.; Fabian, A.C.; Wilman, R.J.; Johnstone, R.M.; Barger, A.J.; Cowie, L.L.
Authors
C.S. Crawford
A.C. Fabian
Dr Richard Wilman r.j.wilman@durham.ac.uk
Associate Professor
R.M. Johnstone
A.J. Barger
L.L. Cowie
Contributors
D. M. Neumann
Editor
J. T. V. Tran
Editor
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).
Citation
Gandhi, P., Crawford, C., Fabian, A., Wilman, R., Johnstone, R., Barger, A., & Cowie, L. (2001, March). Multi-wavelength observations of serendipitous Chandra sources. Presented at Clusters of Galaxies and the High Redshift Universe Observed in X-rays, Savoie, France
Presentation Conference Type | Conference Paper (published) |
---|---|
Conference Name | Clusters of Galaxies and the High Redshift Universe Observed in X-rays |
Start Date | Mar 10, 2001 |
End Date | Mar 17, 2001 |
Publication Date | 2001 |
Deposit Date | Apr 9, 2018 |
Public URL | https://durham-repository.worktribe.com/output/1145614 |
Publisher URL | http://adsabs.harvard.edu/abs/2001cghr.confE..63G |
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