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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
(Tomonori Usuda, Kumiko S. Usuda, Naoyuki Tamura)
by email : sseminar_at_subaru.naoj.org (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.