Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919808b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #198.08; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The infrared surface brightness of a galaxy or of a region within a galaxy depends mainly on the heating intensity and on the interstellar density of the region observed. This project studies how these two contributions are related in SINGS galaxies and how to disentangle them using mid-IR diagnostics.
Helou & Wang used the FIR surface brightness of galaxies in the IRAS Bright Galaxy Sample in conjunction with the infrared to blue ratios and observed a correlation between the interstellar column density and the radiation density. This density-intensity diagram shows that star formation scales with the density of the ISM.
Spitzer offers a great improvement over IRAS in the variety, resolution and sensitivity of the data available, and the SINGS sample and data offer a unique opportunity to revisit the question and constrain the physical parameters of the ISM in these galaxies.
Bot Caroline
SINGS Team
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