The coincidence and angular clustering of Chandra and SCUBA sources

Details The coincidence and angular clustering of Chandra and SCUBA sources The coincidence and angular clustering of Chandra and SCUBA sources

2001-08-24

arxiv.org/abs/astro-ph/0108400v2

Mon.Not.Roy.Astron.Soc. 338 (2003) 303-311

Astronomy and Astrophysics

Astrophysics

12 pages, 8 figures, MNRAS in press. Minor revision, including a comparison with the SED of Arp-220 and an X-ray stacking anal

Scientific paper

10.1046/j.1365-8711.2003.05989.x

We explore the relationship between the hard X-ray and sub-mm populations using deep Chandra observations of a large, contiguous SCUBA survey. In agreement with other recent findings, we confirm that the direct overlap is small. Of the 17 sub-mm sources detected in this field at 850 microns, only one is coincident with a Chandra source. The resulting limits imply that the majority of SCUBA sources are not powered by AGN, unless the central engine is obscured by Compton-thick material with a low (<1 per cent) scattered component. Furthermore, since Chandra detects only ~5 per cent of SCUBA sources, the typical obscuration would need to be almost isotropic. The X-ray upper limits are so strong that in most cases we can also rule out a starburst SED at low redshift, suggesting that the majority of SCUBA sources lie at z>1 even if they are purely starburst galaxies. Despite the low detection rate, we find evidence for strong angular clustering between the X-ray and sub-mm populations. The implication is that AGN and SCUBA sources trace the same large-scale structure but do not generally coincide. If bright sub-mm sources represent massive elliptical galaxies in formation, we suggest that (for a given galaxy) the major episode of star-formation must be distinct from the period of observable quasar activity.

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