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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Physics-TWaP
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2864
DTSTART:20121203T120000
DTEND:20121203T130000
LOCATION:4421 Sterling Hall
SUMMARY:"H-alpha Dots: A Catalog of Faint Emission-line Objects Discovered in Narrowband Images"\, Other...\, Jessica Kellar\, Darthmouth College
DESCRIPTION:I discovered a number of isolated and compact sources of emission (aEurooeH-alpha dotsaEuro) in a narrow-band H-alpha survey.  These H-alpha dots could be (1) isolated extra-galactic HII regions associated with a nearby larger galaxy\, (2) dwarf star-forming galaxies\, or (3) background galaxies\, where another strong emission-line such as [OIII]5007 has redshifted into the H-alpha filter.  Based on follow-up spectra taken at the MDM 2.4 meter telescope and HET\, I determined that the H-alpha dots are a combination of nearby (z~0.01) dwarf star-forming galaxies and intermediate-redshift (mostly at z~0.3) starforming galaxies and AGN.  I will discuss the star-formation properties\, environments\, and metallicities of the dwarf galaxies.  The star-forming galaxies at z~0.3 are very metal-poor\, which suggests that they may be recently formed.  I will discuss the insights this diverse sample of galaxies from the H-alpha dot survey can give us about galaxy evolution.
URL:http://www.physics.wisc.edu/twap/view.php?id=2864
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