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A survey of weak MgII absorbers at 0.4 < z < 2.4
http://hdl.handle.net/10091/10119
http://hdl.handle.net/10091/10119e3a714cc-bdaa-4b5e-8d32-ca69cfa7dccb
名前 / ファイル | ライセンス | アクション |
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ApJ_660_1093.pdf (433.3 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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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 | galaxies : evolution, intergalactic medium, 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× Misawa, T× Charlton, JC× Kim, TS |
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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 |
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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 | |||||
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