Metallic Absorbers and the Evolution of Galaxy Haloes and the Metagalactic Ionizing Background

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dc.creatorBoksenberg, Alec
dc.creatorSargent, Wallace L. W.
dc.creatorRauch, Michael
dc.date1998-10-30
dc.date.accessioned2026-07-07T02:28:50Z
dc.date.available2026-07-07T02:28:50Z
dc.descriptionAn extremely careful separation of the weak metal-line systems relating to the Lyman forest absorbers into individual ``single-phase ionization'' components with accurate parameters has yielded a large sample in the wide redshift range 1.9 < z < 4.4. The systems typically span several hundred km/s and within each the components show a strong coherence in their ionization properties. No sudden evolution is found in the column density ratio N(Si IV)/N(C IV), contrary to previous indication of a large change near z = 3, although there is an apparent rise below z~2.2 and above z~3.8. A smooth not sudden spectral evolution is reflected in the z distribution of N(N V)/N(C IV). Comparisons of N(Si IV)/N(C IV) vs N(C II)/N(C IV) from the observations with CLOUDY derived values using several model ionizing spectra show the general dominance of a QSO ionizing background at the lower redshifts while an additional strong and eventually dominating stellar contribution is required progressively to higher redshifts.
dc.description6 pages, Latex with 10 Postscript figures included. Uses blois.sty. To appear in Proc. of Xth Rencontres de Blois `The Birth of Galaxies'
dc.identifierhttps://arxiv.org/abs/astro-ph/9810502
dc.identifierhttp://arxiv.org/abs/astro-ph/9810502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13228
dc.subjectAstrophysics
dc.titleMetallic Absorbers and the Evolution of Galaxy Haloes and the Metagalactic Ionizing Background
dc.typetext

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