Accuracy of Quasar Black Hole Mass Estimates

Details Accuracy of Quasar Black Hole Mass Estimates Accuracy of Quasar Black Hole Mass Estimates

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10691v&link_type=abstract

HST Proposal ID #10691

Statistics

Methodology

Hst Proposal Id #10691 Agn/Quasars

Scientific paper

We propose to quantify the accuracy to which black hole masses in high-redshift quasars can be estimated by using single-epoch spectra and scaling relationships that relate broad-line region size to luminosity. This study will be based on the large existing databases of UV and optical HST spectra and ground-based optical spectra from previous monitoring programs on the 36 active galactic nuclei with reverberation-based black hole mass measurements. Scaling relationships based on reverberation results can be and are already being used to estimate black hole masses at high redshift, as they are easy to use and it is the only method of mass estimation that is at present straightforwardly extendable to large samples of distant, luminous quasars. Knowledge of the efficacy, accuracy, and limitations of the methods used to estimate black hole masses at high-z is crucial to our quest to advance our understanding of structure growth and evolution in the early Universe. This study will also address the systematic errors that can be encountered when applying this methodology to narrow-line Seyfert 1 galaxies. We will consider in detail the slope of the radius-luminosity relationship for the C IV emission line in light of recent HST evidence that the slope of this relationship differs from that of the radius-luminosity relationship for the Balmer lines.

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