Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..137a&link_type=abstract
At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o
Astronomy and Astrophysics
Astronomy
Scientific paper
Deep SCUBA surveys have uncovered a large population of dust-enshrouded star-forming galaxies at z≈ 2. Using the ultra-deep 2 Ms Chandra Deep Field-North survey we recently showed that a large fraction of these systems are also undergoing intense black-hole growth. Here we provide constraints on the properties of the black holes in SCUBA galaxies using the virial black-hole mass estimator and show that typical SCUBA galaxies host black holes with MBH≈5×107 M&sun; that are accreting at ≈ 20% of the Eddington limit. We discuss these results in the context of the joint black-hole-galaxy growth for the progenitors of today's massive galaxies and find that the black holes in SCUBA galaxies are up-to an order of magnitude smaller than those found for comparably massive galaxies in the local Universe. This implies that these high-z sources will need to undergo considerable additional black-hole growth before lying on the locally defined black-hole-spheroid mass relationship, in qualitative agreement with the results presented in te{borys05}.
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