NOAO >   Observing Info >   Approved Programs >   2003A-0455

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Proposal Information for 2003A-0455


PI: Kentaro Aoki, Subaru Telescope, NAOJ, kaoki@subaru.naoj.org
Address: 650, North A'ohoku Place, Hilo, Hawaii 96720, U.S.A.

CoI: Kouji Ohta, Dept. of Astronomy, Kyoto University
CoI: Toshihiro Kawaguchi, LUTH, Paris-Meudon Observatory

Title: The Black Hole Mass - Bulge Luminosity Relation of Narrow-line Seyfert 1 Galaxies

Abstract: Narrow-Line Seyfert 1 galaxies (NLS1s) are a subclass of Active Galactic Nuclei (AGNs) which are thought to contain less massive black- holes with high accretion rate for a given luminosity. The less massive black-hole with high accretion rate means NLS1s are in an early phase of massive black-hole formation. NLS1s are the key objects for study of the formation and evolution of AGNs. The correlations between the black- hole mass (M_BH) and the [O III] line width, and the bulge luminosity (L_bulge) in AGNs and quiescent galaxies have been established. Recent discovery of possibility of lower M_BH/L_bulge in NLS1s than Broad-Line Seyfert1s and quiescent galaxies would support the black hole in NLS1s has not grown enough yet. We therefore propose to measure the bulge luminosity by imaging and estimate M_BH using [O III] line width by spectroscopy in order to confirm lower M_BH/L_bulge in NLS1s. If the lower M_BH/L_bulge in NLS1s are established, it will have a big impact on the scenario that NLS1s are in an early stage of BH evolution.


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