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The Magellanic Bridge as a Damped Lyman Alpha System: Physical Properties of Cold Gas Toward PKS 0312-770
http://hdl.handle.net/10091/10124
http://hdl.handle.net/10091/1012467de3f0d-8027-4de3-9095-3dc8ce355bc0
| 名前 / ファイル | ライセンス | アクション |
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ApJ_695_1382.pdf (2.1 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||||||||
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| 公開日 | 2010-06-04 | |||||||||||||||
| タイトル | ||||||||||||||||
| タイトル | The Magellanic Bridge as a Damped Lyman Alpha System: Physical Properties of Cold Gas Toward PKS 0312-770 | |||||||||||||||
| 言語 | ||||||||||||||||
| 言語 | eng | |||||||||||||||
| DOI | ||||||||||||||||
| 関連識別子 | https://doi.org/10.1088/0004-637X/695/2/1382 | |||||||||||||||
| 関連名称 | 10.1088/0004-637X/695/2/1382 | |||||||||||||||
| キーワード | ||||||||||||||||
| 主題 | galaxies: abundances, galaxies, Large Magellanic Cloud, Small Magellanic Cloud, Magellanic Clouds, 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 |
Misawa, T
× Misawa, T
× Charlton, JC
× Kobulnicky, HA
× Wakker, BP
× Bland-Hawthorn, J
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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 | The Astrophysical Journal. 695:1382-1398 (2009) | |||||||||||||||
| 書誌情報 |
The Astrophysical Journal 巻 695, 号 2, p. 1382-1398, 発行日 2009-04-20 |
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| 抄録 | ||||||||||||||||
| 内容記述 | We measure the physical properties of a local multicomponent absorption-line system at V-circle dot similar to 200 km s(-1) toward the quasar PKS 0312-770 behind the Magellanic Bridge (MB) using Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS) spectroscopy in conjunction with photoionization modeling. At an impact parameter of similar to 10 kpc from the Small Magellanic Cloud (SMC), this sightline provides a unique opportunity to probe the chemical properties and ionization structure in a nearby absorption line system with a column density of log N-H I similar to 20.2, at the transition between damped Ly alpha (DLA) and sub-DLA systems. We find that metallicity of -1.0 < log(Z/Z(circle dot)) < -0.5 and ionization parameter of -6 < logU < -5 for three low-ionization components and logU similar to -2.6 for one high-ionization component. One component at V-circle dot = 207 km s(-1) shows an alpha-element abundance log( Si/H) similar to -5.0, making it similar to 0.2 dex more metal-rich than both SMC HII regions and stars within the MB and the SMC. The N/Si ratio in this component is log( N/Si)= -0.3 +/- 0.1, making it comparable to other N-poor dwarf galaxies and similar to 0.2 dex lower than Hii regions in the SMC. Another component at V-circle dot = 236 km s(-1) shows a similar Si/H ratio but has log(N/Si) = -1.0 +/- 0.2, indicating a nitrogen deficiency comparable to that seen in the most N-poor DLA systems. These differences imply different chemical enrichment histories between components along the same sightline. Our results suggest that if these absorbers are representative some fraction of DLA systems, then (1) DLA systems along single sightlines do not necessarily represent the global properties of the absorbing cloud, and (2) the chemical composition within a given DLA cloud may be inhomogeneous. | |||||||||||||||
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| 収録物識別子 | 0004-637X | |||||||||||||||
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| 収録物識別子タイプ | NCID | |||||||||||||||
| 収録物識別子 | AA00553253 | |||||||||||||||
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| 出版タイプ | VoR | |||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||
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| URL | http://gateway.isiknowledge.com/gateway/Gateway.cgi?&GWVersion=2&SrcAuth=ShinshuUniv&SrcApp=ShinshuUniv&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000265018300056 | |||||||||||||||
