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The coincidence and angular clustering of Chandra and SCUBA sources

Almaini, O.; Scott, S.E.; Dunlop, J.S.; Manners, J.C.; Willott, C.J.; Lawrence, A.; Ivison, R.J.; Johnson, O.; Blain, A.W.; Peacock, J.A.; Oliver, S.J.; Fox, M.J.; Mann, R.G.; Pérez-Fournon, I.; González-Solares, E.; Rowan-Robinson, M.; Serjeant, S.; Cabrera-Guerra, F. and Hughes, D.H. (2003). The coincidence and angular clustering of Chandra and SCUBA sources. Monthly Notices of the Royal Astronomical Society, 338(2) pp. 303–311.

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We explore the relationship between the hard X-ray and submillimetre 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 submillimetre sources detected in this field at 850 mum, only one is coincident with a Chandra source. The resulting limits imply that the majority of SCUBA sources are not powered by acive galactic nuclei (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 spectral energy distribution 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 submillimetre populations. The implication is that AGN and SCUBA sources trace the same large-scale structure but do not generally coincide. If bright submillimetre 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.

Item Type: Journal Item
ISSN: 1365-2966
Extra Information: Some of the symbols may not have transferred correctly into this bibliographic record and/or abstract.
Keywords: active; galaxies; evolution; formation; starburst; X-rays; submillimetre
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 5686
Depositing User: Users 13 not found.
Date Deposited: 25 Oct 2006
Last Modified: 21 Dec 2017 14:52
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