Constraining Quasar Structural Evolution with VLT/ISAAC

Details Constraining Quasar Structural Evolution with VLT/ISAAC Constraining Quasar Structural Evolution with VLT/ISAAC

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009msngr.137...30s&link_type=abstract

The Messenger, vol. 137, p. 30-33

Computer Science

Scientific paper

We describe a VLT-ISAAC spectroscopic survey of the Hb region for more than 50 quasars at redshifts between 1 and 3. We use the width of Hb as a virial estimator of black hole mass and the Eddington ratio. The minimum observed width of Hb increases from ~ 500-1000 km/s at low luminosity to ~ 3500 km/s in the high luminosity domain. This trend is consistent with the virial assumption and a broad line region size-luminosity relation with exponent a ~ 0.65. Broader lined sources show a second very broad and redshifted Hb line component, which should be removed for reliable black hole mass estimation.

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