Subaru Seminars



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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 @).

September 5, Friday, at 11:00 am

" Discovery of the Most Luminous Galaxies with WISE "

Chao-Wei Tsai


I present a class of newly discovered distant dust-enshrouded galaxies with extremely high luminosity, including several Extremely Luminous Infrared Galaxies that reach 10^14 L_Sun. Selected by the extreme red color in WISE bands, their SEDs incorporating the WISE, Spitzer, and Herschel PACS and SPIRE photometry indicate the hot dust dominates the bolometric luminosity. These galaxies are likely powered by highly obscured active galactic nuclei (AGN), and there is no evidence suggesting these systems are beamed or lensed. If these AGNs are radiating at the Eddington limit, the existence of ELIRG at z > 3 places strong constraints on the supermassive black hole (SMBH) growth history since the SMBH seeds form at z ~< 20, suggesting that these supermassive black holes may be born with large mass, or have a very rapid mass assembly, presumably by chaotic accretion. The multi-wavelength follow-up results on selected cases suggest that they are different from normal populations in local M-sigma relation and FIR-radio correlation. Their low source density (~ 10^-5 of LIRGs' at similar redshift) implies that these objects are intrinsically rare, or these objects are a short-lived phase in a more numerous population. If later is the case, these hot, dust-enshrouded galaxies may be an early stage in the interplay between AGN and galaxies.

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

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