Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..11i&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
AKARI (formerly called ASTRO-F) is the first Japanese astronomical infrared satellite and was launched on 2006 February 22 (JST) at the Uchinoura Space Center, JAXA. AKARI is now orbiting around the Earth in a sun-synchronous polar orbit at the altitude of 700km. One of the major programs of the AKARI observations is an all-sky survey in the mid- to far-infrared spectral region with 6 photometric bands. In this presentation, the flight performance and the current status of the mid-infrared survey is reported. The AKARI has a Ritchey-Chretien-type telescope with a primary-mirror aperture size of 685mm, which is cooled down to about 6K by liquid helium and mechanical coolers. The expected liquid helium holding time is about one year. The AKARI mid-infrared survey is being carried out with the 9micron and 18micron bands and the sensitivities are about 80 and 130mJy (5sigma), respectively. The spatial resolution is about 10 arcseconds at both bands. Thus the AKARI survey will achieve a deeper sensitivity and a finer spatial resolution by about an order of magnitude than previous data from the 12 and 25 micron of IRAS. With this survey any brown dwarfs that are 40Mj and 10Gyr old could be detected out to a distance of 2pc. It will also provide a unique and significant database for the statistical study of young stellar objects. A 1Lo protostars or a T Tauri star can be detected to a distance of up to 100pc, and a circumstellar disk such as beta Pic can be detected at < 200pc. The first point source catalogue is planned for preparation 1 year after the completion of the survey and will be released to the public after a 1 year proprietary period for the AKARI team members. The AKARI survey has started from early May and now the data are coming in. We have confirmed the sensitivity and spatial resolution of the mid-infrared survey in orbit. Some early results of the survey will be presented.
Ishihara Daisuke
Onaka Takashi
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