Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50173j&link_type=abstract
Spitzer Proposal ID #50173
Computer Science
Scientific paper
We propose to map the large-scale disk of the optically highly obscured Circinus Galaxy, which remains the only major galaxy in the Local Volume (D < 10 Mpc) whose stellar and ISM components have not been fully explored. And yet Circinus is a most remarkable galaxy. Its close proximity offers a unique opportunity to study in detail star formation processes that are known to be dominant during the z=2-3 galaxy formation era. At a distance of about 3 Mpc, it is the closest known spiral galaxy with a Seyfert 2 nucleus and star-forming circumnuclear ring. While its location behind the Milky Way prevents detailed visual observations of the large-scale disk, we know from radio data that its neutral hydrogen gas envelope is gigantic -- about 100 kpc in diameter. With Spitzer the Galactic Plane can be `stripped away' and Circinus revealed as never seen before, making it the premier laboratory for the study of the starburst-AGN connection. High-resolution mid-infrared imaging of the Circinus galaxy with Spitzer IRAC and MIPS will allow us to measure the size and structure of the stellar disk, the variations in the gas-to-dust ratio, and the radio-infrared correlation.
Jarrett Thomas
Koribalski Baerbel
Staveley--Smith Lister
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