Item type |
学術雑誌論文 / Journal Article(1) |
公開日 |
2010-06-04 |
タイトル |
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タイトル |
Supersolar metallicity in weak MgII absorption systems at z similar to 1.7 |
言語 |
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言語 |
eng |
DOI |
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関連識別子 |
https://doi.org/10.1086/586691 |
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関連名称 |
10.1086/586691 |
キーワード |
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主題 |
galaxies : abundances, intergalactic medium, quasars : absorption lines, quasars : individual (HE 0141-3932, HE 0429-4901, HE 2243-6031) |
資源タイプ |
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資源 |
http://purl.org/coar/resource_type/c_6501 |
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タイプ |
journal article |
著者 |
Misawa, T
Charlton, JC
Narayanan, A
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信州大学研究者総覧へのリンク |
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氏名 |
Misawa, T |
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URL |
http://soar-rd.shinshu-u.ac.jp/profile/ja.ypchuUkV.html |
出版者 |
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出版者 |
The American Astronomical Society |
引用 |
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内容記述 |
The Astrophysical Journal. 679:220-238 (2008) |
書誌情報 |
The Astrophysical Journal
巻 679,
号 1,
p. 220-238,
発行日 2008-05-20
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抄録 |
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内容記述 |
Through photoionization modeling, constraints on the physical conditions of three z similar to 1.7 single-cloud weak Mg II systems [W-r(2796) <= 0.3 angstrom] are derived. Constraints are provided by high-resolution R = 45,000, high-S/N spectra of the three quasars HE0141-3932, HE0429-4091, and HE2243-6031, which we have obtained from the ESO archive of VLT UVES. Results are as follows.(1) The single-cloud weak Mg II absorption in the three z similar to 1.7 systems is produced by clouds with ionization parameters of -3.8 < log U less than or similar to -2.0 and sizes of 1-100 pc. (2) In addition to the low-ionization phase Mg II clouds, all systems need an additional one to three high-ionization phase C IV clouds within 100 km s(-1) of the Mg II component. The ionization parameters of the C IV clouds range from -1.9 < log U < -1.0, with sizes of tens of parsecs to kiloparsecs. (3) Two of the three single-cloud weak Mg II absorbers have near-solar or supersolar metallicities, if we assume a solar abundance pattern. Although such large metallicities have been found for z < 1 weak Mg II absorbers, these are the first high metallicities derived for such systems at higher redshifts. (4) Two of the three weak Mg II systems also need additional low-metallicity, broad Ly alpha absorption lines, offset in velocity from the metal-line absorption, in order to reproduce the full Ly alpha profile. (5) Metallicities in single-cloud weak Mg II systems are more than an order of magnitude larger than those in DLA systems at z similar to 1.7. In fact, there appears to be a gradual decrease in metallicity with increasing N-H (I), from these, the most metal-rich Ly alpha forest clouds, to Lyman limit systems, to sub-DLAs, and finally to the DLAs. |
資源タイプ(コンテンツの種類) |
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内容記述 |
Article |
ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0004-637X |
書誌レコードID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00553253 |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
WoS |
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URL |
http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000255818600017 |