Revealing Supermassive Black Holes in Submillimetre Galaxies with Very Long Baseline Interferometry

Details Revealing Supermassive Black Holes in Submillimetre Galaxies with Very Long Baseline Interferometry Revealing Supermassive Black Holes in Submillimetre Galaxies with Very Long Baseline Interferometry

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532003y&link_type=abstract

American Astronomical Society, AAS Meeting #215, #320.03; Bulletin of the American Astronomical Society, Vol. 42, p.321

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We present continent-scale very long baseline interferometry (VLBI) images, obtained with the European VLBI Network (VLBI), of submillimetre-selected ultraluminous infrared galaxies (ULIRGs) at high-redshift. These resulting maps, which have a synthesized beam size of 30 milliarcsec FWHM, are the highest resolution images of high-redshift starbursts achieved to date, and are the first capable of isolating ultra-compact radio cores -- which must be produced by active supermassive black holes (SMBHs) -- from more extended starburst. We identify these ultra-compact cores in two of our three targets. This is an observational confirmation of current models of the co-evolution of SMBHs and stellar populations, and is consistent with submillimetre-selected galaxies representing transition objects in the merger-driven transformation of gas-rich spirals into massive, passively evolving, spheroidal galaxies. Though ours is a biased sample, and therefore our results more difficult to extendto the demographics of submillimetre galaxies more broadly, this represents a new and promising method for determining the relative bolometric contributions of SMBHs and starbursts to the tremendous energy output of these objects.

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