Star Formation is Very Rapid in Spiral Galaxies

Details Star Formation is Very Rapid in Spiral Galaxies Star Formation is Very Rapid in Spiral Galaxies

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..163t&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Astronomy and Astrophysics

Astronomy

Scientific paper

We estimate a characteristic timescale for star formation in the spiral arms of disk galaxies, going from atomic hydrogen (H I) to dust enshrouded young stars. Drawing on high resolution H I data from The H I Nearby Galaxy Survey (THINGS) and 24 μm images from the Spitzer Infrared Nearby Galaxies Survey (SINGS) for a sample of 14 nearby disk galaxies, we measure the angular offset between the H I and 24 μm emissivity peaks as a function of radius. We model these offsets assuming a kinematic pattern speed, Ω_{p}, and a timescale, t_{{HI}mapsto 24 μ{m}}, for the time span between the dense H I phase and the existence of young stars heating the surrounding dust. The resulting values of t_{{HI}mapsto 24 μ{m}} for the sample, within the range 1-5 Myr, imply a rapid timescale for massive star formation in spiral arms.

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