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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 @).

December 26, Friday, 11:00 am in 104

" Subaru Wide-Field AGN Survey (SWANS) with HSC "

Tohru Nagao

(Ehime University)


Quasars are extremely luminous objects, whose enormous radiative energy is powered by supermassive black holes (SMBHs). The mass of SMBHs sometimes reaches up to 10^10 M_sun, but its formation and evolution are still unclear. Thanks to SDSS and recent NIR wide surveys such as UKIDSS and VIKING, our discoveries of quasars reach at z~7. Interestingly, the discovered quasars at z>6 look to be already "matured"; their SMBH mass exceeds 10^9 M_sun, and the inferred metallicity is already higher than the solar metallicity. Deeper quasar surveys are definitely needed to assess quasars in their growing-up phase and to tackle the physics of the SMBH evolution. We are now promoting a new quasar survey using Hyper Suprime Cam (HSC) with numerous AGN researchers in Japan, Princeton, and Taiwan, under the Subaru Strategic Program (SSP) consortium. We have already found photometric candidates of less-luminous quasars (than SDSS quasars) at z~6-7. The combination of the HSC-SSP data and the WISE all-sky survey data brought us a unique sample of heavily obscured AGNs at z~2 (Toba et al., to be submitted soon). For theoretical interpretations of the HSC-SSP outcomes, we are preparing a new quasar mock catalog based on the AGN semi-analytic model (Enoki et al. 2014) and on N-body simulations with a huge volume. In this seminar, I would like to review some recent results of our HSC-SSP quasar survey and show our future prospects, including possible new collaborative works with various newcomers.


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



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