Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1418l&link_type=abstract
American Astronomical Society Meeting 208, #14.18; Bulletin of the American Astronomical Society, Vol. 38, p.96
Other
Scientific paper
There has been significant controversy as to whether the global aromatic features in emission (AFEs) over 5-12 microns can be used as a robust tracer of the current star formation rate in normal galaxies. On one hand, it has been shown that AFEs are apparently correlated in flux to well-known star formation tracers such as the H-alpha line emission; on the other hand, there is a long list of observational evidences for a significant amount of AFEs originated from diffuse ISM not directly related to ionizing stars. We have constructed a 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 infrared and sub-mm fluxes, we show quantitatively that both these dust components contribute to the global AFE emission. Only for very active star-forming galaxies (e.g., with IRAS 60 micron-to-100 micron flux density ratio > 0.6), does the star-forming component become dominant. We compare our model results with newly available Spitzer SpaceTelescope data on nearby galaxies.
Helou George
Lu Nanyao Y.
Wang Ziqiang
Xu Cong (Kevin)
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