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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 : sseminar_at_subaru.naoj.org (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.



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