Observing the Fast Growth of Black Holes at z 4.8

Details Observing the Fast Growth of Black Holes at z 4.8 Observing the Fast Growth of Black Holes at z 4.8

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940305t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #403.05

Astronomy and Astrophysics

Astronomy

Scientific paper

I will present our team's efforts to measure black hole masses and accretion rates in several high-redshift samples of AGNs, based on extensive NIR spectroscopic campaigns. I will particularly focus on a large sample of z 4.8 AGNs, which were observed in a combined VLT-Gemini campaign. This sample probes the most massive BHs at this epoch, but shows lower masses and higher accretion rates than those of z 2-3.5 sources. When combining these samples together, a clear evolutionary sequence is evident: the z 4.8 BHs grow through Eddington-limited accretion from a broad range of seed masses; their subsequent growth, at duty cycles of 10-20%, forms the most massive BHs observed at z 2.

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