Subaru Seminars



This Month






Site Map

The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : (please change"_at" to @).

March 04, Friday, 11:00 am in 104

" Investigation of the Coevolution between Supermassive Blackholes and Galaxies at Redshift 3 through Subaru Near-Infrared Observations "

Yuriko Saito

(Subaru Telescope)

In the local universe, the tight correlation between galaxy spheroidal stellar mass (Msph) and their central SMBH mass (MBH) was found by previous studies (MBH/Msph ~ 0.0015), suggesting co-evolution between galaxies and SMBHs. To reveal galaxy and SMBH formation mechanisms, one of the keys is exploring the redshift evolution of MBH/Msph ratio, and we have been carried out near-IR observations of z ~ 3 QSOs. MBH was derived by the most reliable Hβ method which uses Hβ (4861Å) emission line width and AGN continuum luminosity at 5100Å. For Msph, multi-band (J (1.2μm), K'-band (2.2μm)) near-IR imaging method is adopted to obtain accurate Msph. To subtract bright AGN glare accurately for obtaining host galaxy light, we established our original analysis method. We derived MBH for 28 z ~ 3 QSOs, and also derived Msph for 9 out of 28 QSOs, and we found that MBH/Msph at z ~ 3 is larger (MBH/Msph(median)~0.046) than the local relation (MBH/Msph ~ 0.0015).

Seminars are also held at JAC, CFHT, and IfA.

Copyright (c) 1999-2000 Subaru Telescope, NAOJ. All rights reserved.