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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 @).

January 05, Monday, 11:00 am in 104

" Far-Infrared and Accretion Luminosities of the Present-Day Active Galactic Nuclei "

Kenta Matsuoka

(Kyoto University)


In decades, the connection between galaxy evolution and the growth of supermassive black holes (SMBHs) has been one of the main topics in extragalactic research. The tight correlation of black hole mass, M_BH, with galaxy properties, e.g., sigma, suggests the coevolution of galaxies and SMBHs. Various observational studies have been devoted to investigating the nature of the coevolution, e.g., the redshift evolution of the M_BH-sigma relation mainly using type-1 active galactic nuclei (AGNs). The connection between on-going star formation (SF) and AGN activities is also one of the observational signatures, revealing the connection of the growth of stellar mass and the BH growth at the observed epoch. Recently, we investigated the relation between SF and black hole accretion luminosities, using a sample of 689 type-2 AGNs at 0.01 < z < 0.22, which are detected in the far-infrared (FIR) surveys with AKARI and Herschel. By estimating AGN luminosities from narrow emission lines, we found a positive linear trend between FIR (SF) and AGN luminosities over a wide dynamical range. This result appears to be inconsistent with recent reports that low luminosity AGNs show essentially no correlation between FIR and X-ray luminosities, while the discrepancy is likely due to observational biases. In this seminar, I would like to talk about the AGN-SF relation based on above results, and discuss limitations of studying the connection between AGN and SF using current available facilities.


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



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