The Mid-Infrared Colors of Normal Galaxies

Details The Mid-Infrared Colors of Normal Galaxies The Mid-Infrared Colors of Normal Galaxies

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.2404h&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #24.04; Bulletin of the American Astronomical Society, Vol. 29, p.1251

Astronomy and Astrophysics

Astronomy

1

Scientific paper

In a color-color diagram combining IRAS (60 and 100mu m) and ISOCAM (7 and 15mu m) data, star forming galaxies display a well defined pattern that highlights the difference between quiescent and active galaxies. Quiescent galaxies have a roughly constant ISOCAM 7-to-15mu m color ratio even though the IRAS 60-to-100mu m ratio varies by a factor 2. Active star forming galaxies however show a steeply decreasing mid-infrared color ratio as the 60-to-100mu m ratio continues to increase. The knee appears associated with a radiation intensity about a thousand times greater than the interstellar radiation intensity near the Sun, and an equilibrium grain temperature of about 100K. This behavior can be well understood in terms of the increasing heating intensity pushing the thermally stable dust population to 100K so this population increasingly dominates the 15mu m band, while at lower heating intensities the fluctuating grains dominate both of the ISO-CAM mid-infrared bands. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) with the participation of ISAS and NASA. This research was supported in part by ISO Data Analysis funding from the National Aeronautics and Space Administration.

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