Excess 4.5 Micron Emission from SINGS Galaxies

Details Excess 4.5 Micron Emission from SINGS Galaxies Excess 4.5 Micron Emission from SINGS Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0406r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #04.06; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

In the SINGS images of nearby galaxies the two short wavelength IRAC channels on Spitzer (3.6 microns and 4.5 microns) primarily observe stellar photospheric emission while the two longer wavelength channels also observe significant emission from polycyclic aromatic hydrocarbons (PAHs).
In this poster we will present maps of the ratio of 4.5 to 3.6 micron emission for galaxies in SINGS sample. These ratio maps show a strong correlation between high ratios of 4.5 to 3.6 micron emission and PAH emission. In these high ratio regions the ratio is up to a factor of two higher than what is seen from stellar emission alone. We show that the high ratio is due to an excess of 4.5 micron emission and discuss possible reasons for this excess.

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