Abstract
We investigate the origin of the huge luminosities produced by high-redshift SCUBA galaxies using the combination of ultra-deep X-ray observations (the 2 Ms Chandra Deep Field-North) and deep optical spectroscopic data. Even though a large fraction of high-redshift SCUBA galaxies host AGN activity (upward of 38%), we argue that in almost all cases the AGNs are not bolometrically important (i.e., contribute <20% of the energetics). Thus, most high-redshift SCUBA galaxies appear to be star-formation dominated. A substantial fraction of high-redshift SCUBA galaxies show evidence for binary AGN activity. Since these systems appear to be interacting and merging at optical/near-IR wavelengths, their super-massive black holes are likely to eventually coalesce.
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Alexander, D. What Powers High-Redshift SCUBA Galaxies?. In: Merloni, A., Nayakshin, S., Sunyaev, R.A. (eds) Growing Black Holes: Accretion in a Cosmological Context. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11403913_14
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DOI: https://doi.org/10.1007/11403913_14
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Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-25275-7
Online ISBN: 978-3-540-31639-8
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