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  1. 100 全学教育機構
  2. 1001 学術論文

A survey of weak MgII absorbers at 0.4 < z < 2.4

http://hdl.handle.net/10091/10119
http://hdl.handle.net/10091/10119
e3a714cc-bdaa-4b5e-8d32-ca69cfa7dccb
名前 / ファイル ライセンス アクション
ApJ_660_1093.pdf ApJ_660_1093.pdf (433.3 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2010-06-03
タイトル
言語 en
タイトル A survey of weak MgII absorbers at 0.4 < z < 2.4
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 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, A

× Narayanan, A

WEKO 45992

Narayanan, A

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Misawa, T

× Misawa, T

WEKO 45993

Misawa, T

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Charlton, JC

× Charlton, JC

WEKO 45994

Charlton, JC

Search repository
Kim, TS

× Kim, TS

WEKO 45995

Kim, TS

Search repository
信州大学研究者総覧へのリンク
氏名 Misawa, T
URL http://soar-rd.shinshu-u.ac.jp/profile/ja.ypchuUkV.html
出版者
出版者 The American Astronomical Society
引用
内容記述タイプ Other
内容記述 The Astrophysical Journal. 660:1093-1105 (2007)
書誌情報 The Astrophysical Journal

巻 660, 号 2, p. 1093-1105, 発行日 2007-05-10
抄録
内容記述タイプ Abstract
内容記述 We present results from a survey of weak Mg II absorbers in the VLT/UVES spectra of 81 QSOs obtained from the ESO archive. In this survey, we identified 112 weak Mg II systems within the redshift interval 0.4 < z < 2.4 with 86% completeness down to a rest-frame equivalent width of W-r(2796) = 0.02 angstrom, covering a cumulative redshift path length of Delta Z similar to 77.3. From this sample, we estimate that the number of weak absorbers per unit redshift (dN/dz) increases from 1.06 +/- 0.04 at < z > = 1.9 to 1.76 +/- 0.08 at < z > = 1.2 and thereafter decreases to 1.51 +/- 0.09 at < z > = 0.9 and 1.06 +/- 0.10 at < z > = 0.6. Thus, we find evidence for an evolution in the population of weakMg II absorbers, with their number density peaking at z = 1.2. We also determine the equivalent width distribution of weak systems at < z > =0.9 and < z > = 1. 9. At 0.4 < z < 1.4, there is evidence for a turnover froma power law of the form n(Wr) proportional to W-r(-1.04) at Wr(2796) < 0.1 angstrom. This turnover is more extreme at 1.4 < z < 2.4, where the equivalent width distribution is close to an extrapolation of the exponential distribution function found for strong Mg II absorbers. Based on these results, we discuss the possibility that some fraction of weak Mg II absorbers, particularly single cloud systems, are related to satellite clouds surrounding strong Mg II systems. These structures could also be analogs to MilkyWay high-velocity clouds. In this context, the paucity of high-redshift weak Mg II absorbers is caused by a lack of isolated clouds accreting onto galaxies during that epoch.
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
識別子タイプ DOI
関連識別子 https://doi.org/10.1086/512852
関連名称 10.1086/512852
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=000246571300016
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