Forskning ved Københavns Universitet - Københavns Universitet


Black Hole Masses of High-Redshift Quasars

Publikation: Bidrag til tidsskriftKonferenceartikelForskningfagfællebedømt

Black-hole masses of distant quasars cannot be measured directly, but can be estimated to within a factor 3 to 5 using scaling relationships involving the quasar luminosity and broad-line width. Why such relationships are reasonable is summarized. The results of applying scaling relationships to data of quasars at a range of redshifts (z ≤ 6.3) are presented. Luminous quasars typically have masses ~ 109M⊙ even at the highest redshifts. The fact that such massive black holes appear as early as at z ≈ 6 indicate that black holes form very early or build up mass very fast.
TidsskriftMULTIWAVELENGTH AGN SURVEYS. Proceedings of the Guillermo Haro Conference 2003. Held 8-12 December 2003 in Cozumel, Mexico. Edited by Raúl Mújica (Instituto Nacional de Astrofísica, Óptica y Electrónica, Mexico) & Roberto Maiolino (INAF-Osservatorio Astrofisico di Arcetri, Italy)
Sider (fra-til)385-388
StatusUdgivet - 1 okt. 2004
Eksternt udgivetJa

ID: 230100634