STAR-FORMING CLOUD COMPLEXES IN THE CENTRAL MOLECULAR ZONE OF NGC 253
文献类型：期刊论文
| 作者 | Sakamoto, Kazushi1; Mao, Rui-Qing2 ; Matsushita, Satoki1,3; Peck, Alison B.3; Sawada, Tsuyoshi3,4; Wiedner, Martina C.5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2011-07-01 |
| 卷号 | 735期号:1页码:19(12) |
| 关键词 | galaxies: individual (NGC 253) galaxies: ISM galaxies: starburst |
| ISSN号 | 0004-637X |
| 英文摘要 | We report 350 and 230 GHz observations of molecular gas and dust in the starburst nucleus of NGC 253 at 20-40 pc (1 ''-2 '') resolution. The data contain CO(3-2), HCN(4-3), CO(2-1), (CO)-C-13(2-1), (CO)-O-18(2-1), and continuum at 0.87 mm and 1.3 mm toward the central kiloparsec. The CO(2-1) size of the galaxy's central molecular zone (CMZ) is measured to be about 300 pc x 100 pc at the half-maximum of intensity. Five clumps of dense and warm gas stand out in the CMZ at arcsecond resolution, and they are associated with compact radio sources due to recent massive star formation. They contribute one-third of the CO emission in the central 300 pc and have (CO)-C-12 peak brightness temperatures around 50 K, molecular gas column densities on the order of 10(4) M-circle dot pc(-2), gas masses on the order of 10(7) M-circle dot in the size scale of 20 pc, volume-averaged gas densities of n(H2) similar to 4000 cm(-3), and high HCN-to-CO ratios suggestive of higher fractions of dense gas than in the surrounding environment. It is suggested that these are natal molecular cloud complexes of massive star formation. The CMZ of NGC 253 is also compared with that of our Galaxy in CO(2-1) at the same 20 pc resolution. Their overall gas distributions are strikingly similar. The five molecular cloud complexes appear to be akin to such molecular complexes as Sgr A, Sgr B2, Sgr C, and the l = 1 degrees.3 cloud in the Galactic center. On the other hand, the starburst CMZ in NGC 253 has higher temperatures and higher surface (and presumably volume) densities than its non-starburst cousin. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | STARBURST GALAXY NGC-253 ; GALACTIC-CENTER REGION ; FAR-INFRARED EMISSION ; NEARBY GALAXIES ; DENSE GAS ; ROTATIONAL-EXCITATION ; SPATIAL-DISTRIBUTION ; SUBMILLIMETER ARRAY ; SUPERNOVA-REMNANTS ; SOUTHERN STARBURST |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000291788300019 |
| 公开日期 | 2012-08-07 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/4397]  |
| 专题 | 紫金山天文台_分子云与恒星形成研究团组 |
| 作者单位 | 1.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Joint ALMA Off, Santiago, Chile 4.Natl Astron Observ Japan, Tokyo 1818588, Japan 5.CNRS, Observ Paris, LERMA, F-75014 Paris, France |
| 推荐引用方式 GB/T 7714 | Sakamoto, Kazushi,Mao, Rui-Qing,Matsushita, Satoki,et al. STAR-FORMING CLOUD COMPLEXES IN THE CENTRAL MOLECULAR ZONE OF NGC 253[J]. ASTROPHYSICAL JOURNAL,2011,735(1):19(12). |
| APA | Sakamoto, Kazushi,Mao, Rui-Qing,Matsushita, Satoki,Peck, Alison B.,Sawada, Tsuyoshi,&Wiedner, Martina C..(2011).STAR-FORMING CLOUD COMPLEXES IN THE CENTRAL MOLECULAR ZONE OF NGC 253.ASTROPHYSICAL JOURNAL,735(1),19(12). |
| MLA | Sakamoto, Kazushi,et al."STAR-FORMING CLOUD COMPLEXES IN THE CENTRAL MOLECULAR ZONE OF NGC 253".ASTROPHYSICAL JOURNAL 735.1(2011):19(12). |
入库方式： OAI收割
来源：紫金山天文台
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