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• W2562171817 abstract "Type of report: Final ReportGrant: Astrophysics Data Program grant NAG 5-13i7Title of research: OPTIMAL EXTRACTION OF QUASAR LYMAN LIMITABSORPTION SYSTEMS FROM THE IUE ARCHIVEPI: David Tytler, GASS, C-0111, UCSD, La Jolla, CA 92093May 10th, 1992ABSTRACTThe IUE archive contains a wealth of information on Lyman limit absorption systems(LLS) in quasar spectra. QSO spectra from the IUE data base have been optimally ex-tracted, coadded, and analyzed to yield a homogeneous sample of LLS at low redshifts.This sample comprise 36 LLS, twice the number previously analyzed low z samples. Thesesystems are ideal for the determination of the origin, redshift evolution, ionization, veloc-ity dispersions and the metal abundances of absorption systems. Two of them are alsoexcellent targets for the determination of the primordial Deuterium to Hydrogen ratio.1. INTRODUCTIONThe study of quasar absorption systems is an inherently statistical endeavor becausea large sample of systems will include absorption from all the different types of extendedgaseous objects in the universe. The study of absorption systems complements the studyof luminous objects because the latter are condensed, while absorption systems are mostreadily detected in highly extended structures which present the biggest cross-sections.Going back in time the importance of absorption increases because a larger fraction of themass of the universe was in an extended gaseous form.Key questions to be addressed are the determination of the types of objects whichcause the majority of the absorptions, and the investigation of the physical properties ofthose objects. The absorbers can either be intervening material unassociated with thequasar, or gas in the immediate vicinity of the quasar, which may have been acceleratedby the quasar itself. The primary way to distinguish between these two alternatives is thestatistical analysis of unbiased samples of systems.Intervening systems should satisfy each of the following three constraints (Bahcall andPeebles 1969).1. They should have a wide-spread cosmological distribution. Except for (gravi-tational) clusteridg near to the quasars, there should not be any excess of systems atvelocities similar to that of the quasar.2. The number of intervening absorbers seen in a given redshift range in the spectra ofdifferent quasars should fit a Poisson distribution. In particular, the number of absorbersobserved per unit redshift should not depend on any properties of the quasars themselves.3. The density of systems per unit redshift should be a function of only the cosmo-logical evolution of the absorbers, and rate of expansion of the universe." @default.
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• W2562171817 date "1992-01-01" @default.
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• W2562171817 title "Type of report: Final Report Grant: Astrophysics Data Program grant NAG 5-13i7 Title of research: OPTIMAL EXTRACTION OF QUASAR LYMAN LIMIT ABSORPTION" @default.
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