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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 : (please change"_at" to @).

February 26, Friday, 11:00 am in 104

" Extremely Massive Black Holes at 1<z<6 "

Hyunsung Jun


Using ground- and space-based spectroscopy, we present the rest-frame optical spectral properties of 181 distant and luminous quasars to understand the growth of the most massive black holes. Including the latest Akari space observations of H-alpha emission at 3<z<6, we extend scaling relations between rest-frame optical continuum and line luminosities and find that a single log-linear relation holds over 42<log L(5100, ergs/s)<47 and 0<z<6. Similar scaling relations are found between the optical and the UV for continuum luminosities and line widths. Applying these scaling relations to the locally derived H-beta black hole mass (M(BH)) estimator, we derive M(BH) estimators based on H-alpha, MgII, and CIV lines. We find that masses based on UV lines are consistent with those based on Balmer lines, but with a large intrinsic scatter of 0.40 dex for the CIV estimates. Our Akari H-alpha spectra confirm the existence of black holes as massive as ~10 billion solar masses out to z~5, confirming with a more secure footing previous MgII studies that showed rapid black hole growth in the early universe. With the IRTF spectra of extremely massive quasars at 1<z<2 we investigate possible systematics that could bias the black hole mass measurements, and discuss implications for the coevolution of the most massive black hole-galaxy systems.

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

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