Physics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..57s&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Physics
Galaxies: Ism, Infrared: Ism, Ism: Dust, Extinction
Scientific paper
We present our latest results on the mid-infrared imaging and spectroscopy of the nearby late-type spiral galaxy NGC6946 with the Infrared Camera (IRC) on board AKARI}. Based on the mid-infrared imaging with the S7(7μm) and S11(11μm) bands, we find larger S7/S11 ratio in the arm region than in the interarm region. We have investigated the UIR band spectrum of a star forming region located on the arm of NGC6946 as well as that of its outside. We find that the relative band strengths of the UIR 6.2, 7.7, and 8.6μm bands to the 11.2μm band are larger in the star forming region located on the arm than its outside even if the interstellar extinction of A_V=3mag towards the star forming region is taken into account. The present result suggests that the ratios of 6.2μm/11.2μm, 7.7μm/11.2μm, and 8.6μm/11.2μm can be used as direct and efficient tools to measure the on-going star formation activity in remote galaxies.
Kaneda Hidehiro
Matsuhara Hideo
Ohyama Yoichi
Onaka Takashi
Sakon Itsuki
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