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Event: "The H-alpha and Infrared Star Formation Rates for the Nearby Field Galaxy Survey."
Event Date/Time: March 6, 2003 4:00 pm
Location:Steward Observatory Room N210
Speaker:Dr. Lisa Kewley
Institution:Harvard-Smithsonian Center for Astrophysics
Subject(s): Steward/NOAO Colloquium 
Contact:Jill Bechtold    email: jill@as.arizona.edu   phone: 520-621-6533
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Event Description
Posted:
November 26, 2002 3:17 pm

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NOAO/KPNO - NSO, DEPARTMENT OF ASTRONOMY AND STEWARD OBSERVATORY AND NRAO

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The University of Arizona

JOINT COLLOQUIUM

DR. LISA KEWLEY

Harvard-Smithsonian Center for Astrophysics

"The H-alpha and Infrared Star Formation Rates for the Nearby Field Galaxy Survey."

Thursday, March 6, 2003

4:00 p.m.

Steward Observatory

Lecture Hall - Room N210

Abstract:

I present a comparison of the H-alpha and infrared star formation rate (SFR) diagnostics for galaxies 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.

Refreshments at 3:30PM in the Lobby



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