A WISE View of Nearby Spiral Galaxies: mapping the spatial distribution of star formation and stellar mass along the Hubble sequence

Details A WISE View of Nearby Spiral Galaxies: mapping the spatial distribution of star formation and stellar mass along the Hubble sequence A WISE View of Nearby Spiral Galaxies: mapping the spatial distribution of star formation and stellar mass along the Hubble sequence

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733312m&link_type=abstract

American Astronomical Society, AAS Meeting #217, #333.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Spiral density waves are believed to trigger star formation (SF) in spiral arms and determine the gaseous and dynamic evolution of galactic disks. The
Wide-field Infrared Survey Explorer (WISE) offers a unique opportunity to study spiral structure in thousands of galaxies by tracing SF in the mid-IR (12 & 22 μm) and old stellar populations in the near-IR (3.4 & 4.6 μm). We present early results of a pilot study of spiral structure in several grand-design and optically flocculent spirals exhibiting varying degrees of bulge/disk size ratio, spiral-arm pitch angle, and absence/presence of bars.
We combine the WISE data with archival UV data to explore the spatial distribution of specific SF rate, stellar mass surface density and PAH emission across all morphologies. To better match spatial resolutions across wavelengths and accentuate structure on small scales, we use a resolution enhancement (HiRes) algorithm specifically designed for WISE. We validate our photometric procedures and SF indicators by comparing to Spitzer measurements of the classic grand-design spiral: NGC 5194 (M51a).

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