Subaru Seminars



This Month






Site Map

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 (Tomonori Usuda, Kumiko S. Usuda, Naoyuki Tamura) by email : (please change"_at" to @).

May 12, Wednesday, at 11:00 am

" Search for Active Galactic Nuclei Using AKARI Mid-infrared All-Sky Survey "

Shinki Oyabu

(Subaru Telescope)

We are searching for Active Galactic Nuclei (AGNs) using the AKARI Mid-infrared (MIR) All-Sky Survey Catalogue. AKARI is the Japanese infrared sattelite dedicated for the infrared astronomy. Main purpose of AKARI is all-sky survey with new sensitivity and new spatial resolution in the mid- and far-infrared. The infrared search of AGNs is not affected by the dust extinction and the disadvantage of heavy extinction in optical surveys can turn into a valuable detection tool, when observing dust-surrounded AGN in the infrared wavelengths.
Our new survey will have the advantage of following scientific topics;
* The MIR selection can minimize wavelength-dependent selection effects, while the UV and optical emission is easily affected by dust extinction and the radio emission shows big variety. Thus, we can make the unbiased statistical studies.
* According to synthesis models of the X-ray background (XRB; e.g. Ueda et al. 2003), much of the peak intensity of the XRB at 30 keV should be produced by AGNs subject to absorption with a line-of-site hydrogen column density logNH > 23.5 cm^-2. The number density of such AGNs is a key parameter in understanding the accretion history of the universe.
* Using all-sky survey with new sensitivity, we can collect missing population from current catalogs. We can extend the faint end of nearby AGN luminosity functions using new sensitivity as well as the bright end of the distant AGNs using the survey area.
In this talk, we will explain what AKARI is, our AGN search and early results. We will also report that we have started to detect new hidden AGNs in nearby Universe.

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

Copyright (c) 1999-2000 Subaru Telescope, NAOJ. All rights reserved.