Metallicy and Black Hole Masses of z ~ 6 QSOs

Details Metallicy and Black Hole Masses of z ~ 6 QSOs Metallicy and Black Hole Masses of z ~ 6 QSOs

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...7e..14k&link_type=abstract

The Universe at z > 6, 26th meeting of the IAU, Joint Discussion 7, 17-18 August 2006, Prague, Czech Republic, JD07, #14

Physics

Scientific paper

Studies of the very distant (z > 5.7) quasars discovered with the Sloan Digital Sky Survey have revolutionized our understanding of the young universe. Apart from the Gunn-Peterson effect, detected in optical spectra, some surprising results have been obtained from near-infrared spectra of a few such quasars. Firstly, the Fe/α ratios measured are similar to those found at lower redshifts. As Fe enrichment is believed to start only 0.5 - 1 Gyr after the onset of the initiial starburst, whereas α elements are produced almost immediately, this would imply that star formation started at z > 20 or that the iron was not produced by Type Ia supernovae but by, e.g., population III stars. Secondly, the black hole masses derived from the line-width of low ionization emission lines in these quasars are very high (few times 10^9 M[&sun;]), which, in turn, results in very high bulge masses (10^13 M[&sun;]). This result seems to be in conflict with CDM structure formation models, if many of these massive systems are found. Alternatively, the M[BH] - σ[bulge] relation may break down at high redshift. We have observed five additional z ~ 6 QSOs with the VLT to extend the sample to a statistically significant number, with which the scenarios presented above can be tested. Here, we will present the results of the new MgII, CIV and Fe line detections in combination with the optical and NIR data already available.

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