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PRODID:UW-Physics-TWaP
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UID:UW-Physics-Event-2859
DTSTART:20121129T153000
DTEND:20121129T170000
LOCATION:4421 Sterling Hall
SUMMARY:"Revealing the origins and environments of Mg II absorbers with the SDSS and 3D-HST"\, Astronomy Colloquium\, Britt Lundgren\, Astronomy Department
DESCRIPTION: Foreground absorption features in the spectra of distant quasars provide largely unbiased probes of the baryon content of galaxies and the intergalactic medium to high redshift. Absorption features from singly-ionized magnesium (Mg II) are particularly prolific in optical spectra within the range 0.3 < z < 2.0\, and are expected to trace a wide range of galaxy environments and halo-disk processes\, though detecting the individual host galaxies of these absorbers presents an observational challenge.  The extraction of ~100\,000 quasar absorption line systems from the Sloan Digital Sky Survey -I/II and -III has begun to revolutionize our understanding of the host galaxies and environments of Mg II absorbers. I will present highlights from my work examining the statistical properties of Mg II host galaxies from stacking and clustering measurements using the largest absorption line data set ever compiled.  I will also present new direct observations of Mg II host galaxies at z > 1 from the 3D-HST Survey.  These analyses reveal compelling links between high equivalent width Mg II absorbers and large-scale star formation-driven outflows\, which I will discuss in the context of other recent findings from the literature.
URL:http://www.physics.wisc.edu/twap/view.php?id=2859
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