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7Apr2003 - L. Kewley Seminar
Monday 7 April at 1:30pm
Lisa Kewley - Harvard-Smithsonian Center for Astrophysics
"Star Formation Rates in the Nearby Field Galaxy
Survey"
ABSTRACT: "I present a comparison of the H-alpha and infrared star formation
rate (SFR) diagnostics for objects in the Nearby Field Galaxy Survey (NFGS).
There is a strong correlation between the ratio of infrared to optical star-formation
rates SFR(IR)/SFR(H-alpha) and the extinction measured with the Balmer decrement.
Correction of the SFR(H-alpha) for extinction using the Balmer decrement
and a classical reddening curve both reduces the scatter in the SFR(IR)-SFR(H-alpha)
correlation and results in a much closer agreement between the two SFR indicators
to within 10%. This SFR relationship spans 4 orders of magnitude and holds
for all Hubble types with IRAS detections in the NFGS. A constant ratio between
the SFR(IR) and SFR(H-alpha) for all Hubble types, suggests that the IR emission
in all of these objects results from a young stellar population. I will
discuss the implications of this new result and present preliminary work
into SFR indicators at other wavelengths for the NFGS sample."
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