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Global Star Formation and Mid-Infrared Emission Features in Galaxies

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. No.381. Astronomical Society of the Pacific , San Francisco, CA, pp. 46-49. ISBN 978-1-58381-325-6.

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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
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URLURL TypeDescription
Lu, Nanyao0000-0002-8948-1044
Helou, George0000-0003-3367-3415
Additional Information:© 2008 Astronomical Society of the Pacific.
Group:Infrared Processing and Analysis Center (IPAC)
Series Name:ASP Conference Series
Issue or Number:381
Record Number:CaltechAUTHORS:20100728-095411952
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19212
Deposited On:02 Aug 2010 05:04
Last Modified:24 Feb 2020 10:30

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