Spitzer Observations of Two Early-Type Spiral Galaxies with Dust Rings

Details Spitzer Observations of Two Early-Type Spiral Galaxies with Dust Rings Spitzer Observations of Two Early-Type Spiral Galaxies with Dust Rings

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.6006b&link_type=abstract

American Astronomical Society Meeting 205, #60.06; Bulletin of the American Astronomical Society, Vol. 36, p.1443

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present Spitzer images of the SB0/a galaxy NGC 1291 and the SAa galaxy NGC 4594. Both galaxies contain dust rings that can be used for studying the relation between dust emission and star formation activity. At 24 microns, the nuclei of both galaxies are the brightest sources in the galaxies, and dust emission from the rings is relatively weak. At 160 microns, however, the dust rings are more prominent sources; in NGC 4594, the dust ring is the source of virtually all of the 160 micron emission. We discuss whether the 160 micron emission from the rings is related to star formation activity or to heating by older stellar populations, and we examine the relation between dust and PAH emission. For NGC 4594, we also present submillimeter data that show that the nucleus dominates the 850 micron emission. These results demonstate that the 850 micron emission cannot come from the same dust that dominates the 160 micron emission. We examine the possible mechanisms that could be generating the 850 micron emission as well as the implications for dust models and galaxy spectral energy distribution templates.

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