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Ćirković, Milan M.; Samurovic, S.; Djoric, Aleksandra

doi:10.1023/a:1026589918332

Cited by 1 publication

(1 citation statement)

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“…Almost all of these "strong" Mg ii systems are found within 38h −1 kpc of > 0.05L * K galaxies (Bergeron & Boissé 1991;Bergeron et al 1992;Le Brun et al 1993;Steidel, Dickinson, & Persson 1994;Steidel 1995;Steidel et al 1997). Furthermore, both observationally and theoretically, it is also expected that metal-rich absorbing gas can be found out to distances of at least 100h −1 kpc from luminous galaxies (Chen, Lanzetta, & Webb 2001;Ćirković, Samurović, & Djorić 2000). This gas can be detected through absorption in higher ionization species and/or as weak low ionization absorption.…”

Section: Introductionmentioning

confidence: 95%

The Nature of Weak MgiiAbsorbing Structures

Milutinović

Rigby

Masiero

et al. 2006

ApJ

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We consider geometries and physical models for weak low-ionization absorbers based on the relative incidence of low-and high-ionization systems. We present a survey of weak low-ionization systems in 35 high-resolution HST STIS quasar spectra, sometimes supplemented by Keck HIRES and HST FOS data. We found 16 metal-line systems, with low-and/or high-ionization absorption detected. Weak low-ionization absorbers trace an abundant population of metal-enriched regions. Models show that these systems have a $10 pc region of higher density gas and a $1 kpc region that represents a lower density, higher ionization phase. The goal of our survey was to compare systems detected in low-and/or high-ionization gas. All but 1 of the 10 weak low-ionization systems have a related highionization phase. In three cases the high-ionization gas has only a single component, kinematically centered on the low-ionization absorption, and the other six cases have additional high-ionization components offset in velocity. The high-ionization absorption in weak low-ionization systems has similar kinematic structure to that in high-ionizationonly systems. There are just six systems with only a high-ionization phase, as compared to the nine systems with both low-and high-ionization phases. We conclude that filamentary and sheetlike geometries are favored, due to the relatively small observed cross section of high-ionization-only systems. Our statistical arguments suggest that although low-ionization absorbers are not closely associated with luminous galaxies, they arise in their immediate environments within the cosmic web.

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