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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

P. Gandhi

C.S. Crawford

A.C. Fabian

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