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Astrophysics Colloquium--Damped Lyman Alpha Systems (DLAs): The Most Well-understood, Enigmatic Galaxies (Speaker: Regina Jorgen

Tuesday, Apr 30, 2013 4:00p to 5:00p

Abstract: Damped Lyman alpha Systems (DLAs) are observed as absorption features in the lines of sight toward background, high redshift quasars and defined as clouds of neutral gas having N(Hi) >= 2x10^20 cm^-2. DLAs dominate the neutral gas content of the Universe between z=[0,5] and are believed to be the progenitors of modern spiral galaxies. However, despite 25 years of study and over 1000 DLAs discovered, thanks to the SDSS survey, the true nature of these important reservoirs of neutral gas… Show more

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