SUBARCSECOND OBSERVATIONS OF NGC 7538 IRS 1: CONTINUUM DISTRIBUTION AND DYNAMICS OF MOLECULAR GAS
文献类型：期刊论文
| 作者 | Zhu, Lei1,2,3 ; Zhao, Jun-Hui2; Wright, M. C. H.4; Sandell, Goeran5; Shi, Hui1,6; Wu, Yue-Fang3; Brogan, Crystal7; Corder, Stuartt7
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-12-10 |
| 卷号 | 779期号:1 |
| 关键词 | H II regions ISM: jets and outflows ISM: kinematics and dynamics ISM: molecules radio lines: ISM stars: formation |
| 英文摘要 | We report new results based on the analysis of the Submillimeter Array (SMA) and Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of NGC 7538 IRS 1 at 1.3 and 3.4 mm with subarcsecond resolutions. With angular resolutions similar to 0.'' 7, the SMA and CARMA observations show that the continuum emission at 1.3 and 3.4 mm from the hyper-compact H II region IRS 1 is dominated by a compact source with a tail-like extended structure to the southwest of IRS 1. With a CARMA B-array image at 1.3 mm convolved to 0.'' 1, we resolve the hyper-compact H II region into two components: an unresolved hyper-compact core, and a north-south extension with linear sizes of <270 AU and similar to 2000 AU, respectively. The fine structure observed with CARMA is in good agreement with the previous Very Large Array results at centimeter wavelengths, suggesting that the hyper-compact H II region at the center of IRS 1 is associated with an ionized bipolar outflow. We image the molecular lines OCS(19-18) and CH3CN(12-11) as well as (CO)-C-13(2-1) surrounding IRS 1, showing a velocity gradient along the southwest-northeast direction. The spectral line profiles in (CO)-C-13(2-1), CO(2-1), and HCN(1-0) observed toward IRS 1 show broad redshifted absorption, providing evidence for gas infall with rates in the range of 3-10 x 10(-3) M-circle dot yr(-1) inferred from our observations. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000328160100051 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6040]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 4.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA 5.NASA, Ames Res Ctr, SOFIA USRA, Moffett Field, CA 94035 USA 6.Max Planck Inst Radioastron, D-53121 Bonn, Germany 7.NRAO, Charlottesville, VA 22903 USA |
| 推荐引用方式 GB/T 7714 | Zhu, Lei,Zhao, Jun-Hui,Wright, M. C. H.,et al. SUBARCSECOND OBSERVATIONS OF NGC 7538 IRS 1: CONTINUUM DISTRIBUTION AND DYNAMICS OF MOLECULAR GAS[J]. ASTROPHYSICAL JOURNAL,2013,779(1). |
| APA | Zhu, Lei.,Zhao, Jun-Hui.,Wright, M. C. H..,Sandell, Goeran.,Shi, Hui.,...&Corder, Stuartt.(2013).SUBARCSECOND OBSERVATIONS OF NGC 7538 IRS 1: CONTINUUM DISTRIBUTION AND DYNAMICS OF MOLECULAR GAS.ASTROPHYSICAL JOURNAL,779(1). |
| MLA | Zhu, Lei,et al."SUBARCSECOND OBSERVATIONS OF NGC 7538 IRS 1: CONTINUUM DISTRIBUTION AND DYNAMICS OF MOLECULAR GAS".ASTROPHYSICAL JOURNAL 779.1(2013). |
入库方式： OAI收割
来源：国家天文台
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