BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2864
DTSTART:20121203T180000Z
DTEND:20121203T190000Z
DTSTAMP:20260412T041629Z
LAST-MODIFIED:20121128T171243Z
LOCATION:4421 Sterling Hall
SUMMARY:H-alpha Dots: A Catalog of Faint Emission-line Objects Discove
 red in Narrowband Images\, Special Lunch Astronomy Talk\, Jessica Kell
 ar\, Darthmouth College
DESCRIPTION:I discovered a number of isolated and compact sources of e
 mission (aEurooeH-alpha dotsaEuro) in a narrow-band H-alpha survey.  T
 hese H-alpha dots could be (1) isolated extra-galactic HII regions ass
 ociated 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 follo
 w-up spectra taken at the MDM 2.4 meter telescope and HET\, I determin
 ed that the H-alpha dots are a combination of nearby (z~0.01) dwarf st
 ar-forming galaxies and intermediate-redshift (mostly at z~0.3) starfo
 rming galaxies and AGN.  I will discuss the star-formation properties\
 , environments\, and metallicities of the dwarf galaxies.  The star-fo
 rming galaxies at z~0.3 are very metal-poor\, which suggests that they
  may be recently formed.  I will discuss the insights this diverse sam
 ple of galaxies from the H-alpha dot survey can give us about galaxy e
 volution.
URL:https://www.physics.wisc.edu/events/?id=2864
END:VEVENT
END:VCALENDAR