Lyman-Alpha Absorption in the Quasar Triplet Q0107-025A, Q0107-025B, and Q0107-0232: Data Calibration and Line Selection

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dc.creatorPetry, C. E.
dc.creatorImpey, C. D.
dc.creatorFenton, J. L.
dc.creatorFoltz, C. B.
dc.date2006-10-12
dc.date.accessioned2026-07-07T11:26:10Z
dc.date.available2026-07-07T11:26:10Z
dc.descriptionWe present spectroscopic observations for quasars Q0107-025A, Q0107-025B, and Q0107-0232. For the first time, all data obtained with the Hubble Space Telescope's GHRS and FOS for these three quasars are combined. Ly-alpha absorbers selected from the spectra can be used to trace the coherence of the intergalactic medium (IGM) on scales of 1-2 h_{70}^{-1} Mpc over the redshift range 0.4 < z_a < 0.9. A new analysis of double and triple absorber coincidences derived from the improved spectra is performed. Automated line-selection algorithms were used to detect absorption lines in the QSO spectra; coincident absorbers were identified across two and three sight lines based on their proximity to each other in velocity space. A control simulation designed to generate artificial absorption-line spectra was used to gauge the significance of the coincidences. Four intervening metal line absorption systems are detected, with three of the four coincident to the A and B sight lines and one coincident across all three sight lines. This is evidence for substantial clustering among the objects responsible for the metal-enriched gas. By contrast, large scale coherence of the IGM gas is detectable but weak. Fewer than half of the absorbers are coincident on scales of 1-2 h_{70}^{-1} Mpc, a result that is significant at the 99% confidence level, and coherence arises preferentially in the higher column density gas. Triple absorber coincidences occur at a level that is significant at the 99% confidence level, which indicates that the higher column density gas has a planar geometry.
dc.descriptionAccepted for publication in the Astronomical Journal. 72 pages including 13 figures and 19 tables
dc.identifierhttps://arxiv.org/abs/astro-ph/0610350
dc.identifierhttp://arxiv.org/abs/astro-ph/0610350
dc.identifierAstron.J.132:2046-2073,2006
dc.identifierdoi:10.1086/507889
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195737
dc.subjectAstrophysics
dc.titleLyman-Alpha Absorption in the Quasar Triplet Q0107-025A, Q0107-025B, and Q0107-0232: Data Calibration and Line Selection
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