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  1. 100 全学教育機構
  2. 1001 学術論文

THE CHEMICAL AND IONIZATION CONDITIONS IN WEAK Mg II ABSORBERS

http://hdl.handle.net/10091/10713
a5f8c36e-264c-4230-aa02-8548b23f192a
名前 / ファイル ライセンス アクション
CHEMICAL_IONIZATION_CONDITIONS.pdf CHEMICAL_IONIZATION_CONDITIONS.pdf (1.9 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2010-10-18
タイトル
言語 en
タイトル THE CHEMICAL AND IONIZATION CONDITIONS IN WEAK Mg II ABSORBERS
言語
言語 eng
キーワード
主題Scheme Other
主題 galaxies: evolution
キーワード
主題Scheme Other
主題 Galaxy: halo
キーワード
主題Scheme Other
主題 intergalactic medium
キーワード
主題Scheme Other
主題 quasars: absorption lines
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Narayanan, Anand

× Narayanan, Anand

WEKO 45938

Narayanan, Anand

Search repository
Charlton, Jane C.

× Charlton, Jane C.

WEKO 45939

Charlton, Jane C.

Search repository
Misawa, Toru

× Misawa, Toru

WEKO 45940

Misawa, Toru

Search repository
Green, Rebecca E.

× Green, Rebecca E.

WEKO 45941

Green, Rebecca E.

Search repository
Kim, Tae-Sun

× Kim, Tae-Sun

WEKO 45942

Kim, Tae-Sun

Search repository
信州大学研究者総覧へのリンク
氏名 Misawa, Toru
URL http://soar-rd.shinshu-u.ac.jp/profile/ja.ypchuUkV.html
出版者
出版者 UNIV CHICAGO PRESS
引用
内容記述タイプ Other
内容記述 The Astrophysical Journal. 689(2):782-815 (2008)
書誌情報 The Astrophysical Journal

巻 689, 号 2, p. 782-815, 発行日 2008-12-20
抄録
内容記述タイプ Abstract
内容記述 We present an analysis of the chemical and ionization conditions in a sample of 100 weak Mg II absorbers identified in the VLT/UVES archive of quasar spectra. In addition to Mg II, we present equivalent width and column density measurements of other low ionization species such as Mg I, Fe II, Al II, C II, SI II, and also Al III. We find that the column densities of C II and Si II are strongly correlated with the column density of Mg II, with minimal scatter in the relationships. The column densities of Fe II exhibit an appreciable scatter when compared with the column density of Mg II, with some fraction of clouds having N( Fe II) similar to N(Mg II), in which case the density is constrained to n(H) > 0.05 cm(-3). Other clouds in which N(Fe II) << TN( Mg II) have much lower densities. From ionization models, we infer that the metallicity in a significant fraction of weak Mg II clouds is constrained to values of solar or higher, if they are sub-Lyman-limit systems. Based on the observed constraints, we hypothesize that weak Mg II absorbers are predominantly tracing two different astrophysical processes/structures. A significant population of weak Mg II clouds, those in which N(Fe II) << N(Mg II), identified at both low (z similar to 1) and high (z similar to 2) redshift, are likely to be tracing gas in the extended halos of galaxies, analogous to the Galactic high-velocity clouds. These absorbers might correspond to alpha-enhanced interstellar gas expelled from star-forming galaxies, in correlated supernova events. The N(Mg II) and N(Fe II)/ N( Mg II) in such clouds are also closely comparable to those measured for the high-velocity components in strong Mg II systems. An evolution is found in N(Fe II)/N(Mg II) from z 2.4 to z 0.4, with an absence of weak Mg II clouds with N(Fe II) similar to N(Mg II) at high-z. The N(Fe II) similar to N( Mg II) clouds, which are prevalent at lower redshifts (z < 1.5), must be tracing Type Ia enriched gas in small, high-metallicity pockets in dwarf galaxies, tidal debris, or other intergalactic structures.
資源タイプ(コンテンツの種類)
内容記述タイプ Other
内容記述 Article
ISSN
収録物識別子タイプ ISSN
収録物識別子 0004-637X
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA00553253
DOI
関連識別子
識別子タイプ DOI
関連識別子 https://doi.org/10.1086/592763
関連名称
関連名称 10.1086/592763
権利
権利情報 Copyright (c) 2008 The American Astronomical Society
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
WoS
表示名 Web of Science
URL http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000261189600011
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