Lu, Nanyao and Helou, George (2008) Global Star Formation and Mid-Infrared Emission Features in Galaxies. In: The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, 381 . Astronomical Society of the Pacific , San Francisco, CA, pp. 46-49. ISBN 978-1-58381-325-6 http://resolver.caltech.edu/CaltechAUTHORS:20100728-095411952
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In view of the controversy as to whether the global aromatic features in emission (AFEs) can be used as a robust tracer of the current star formation in normal galaxies, we have constructed a simple two-temperature dust emission model consisting of a cold (diffuse) component of 20K and a warm component associated with star-forming regions. Based on a large sample of star-forming galaxies with available homogeneous IRAS infrared and SCUBA sub-mm fluxes, we show that both these dust components contribute to the global AFE emission. Only for very active star-forming galaxies (e.g., with IRAS f_ν(60 μm)/f_ν(100 μm) > 0.6), does the star-forming component become dominant. We show that our model predictions are consistent with the Spitzer archival data in the case of the nearby galaxy NGC6946.
|Item Type:||Book Section|
|Additional Information:||© 2008 Astronomical Society of the Pacific.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||02 Aug 2010 05:04|
|Last Modified:||26 Dec 2012 12:16|
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