The Mid-Infrared Morphology of Normal Galaxies: ISOCAM images at 7 and 15 microns

Details The Mid-Infrared Morphology of Normal Galaxies: ISOCAM images at 7 and 15 microns The Mid-Infrared Morphology of Normal Galaxies: ISOCAM images at 7 and 15 microns

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.6701s&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #67.01; Bulletin of the American Astronomical Society, Vol. 28, p.1356

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We report on ISO-CAM observations and display images for about 20 galaxies at 7 and 15 mu m, with 7" resolution on a grid with 3" pixels. The images look similar at the two wavelengths, and generally similar to the visible light images from the POSS plates, though star forming regions are highlighted in the mid-IR. The calibration of ISO-CAM data is uncertain at the 20% level, so colors are comparable across the sample. There are significant variations in the 7-to-15 mu m colors: within galaxies, especially between central regions and disk emission, and from galaxy to galaxy. The global 7-to-15mu m colors in these galaxies are well correlated with their 60-to-100mu m colors. This is consistent with the interpertation that the 7mu m emission is dominated by PAHs, whereas the 15mu m emission is mostly due to hot dust, and the 7-to-15 mu m ratio reflects the mean heating intensity. ISO (The Infrared Space Observatory) is an ESA mission with participation by NASA and ISAS. The CAM instrument was built by Cesarsky et al. (1996, A&AL, Nov 10).

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