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题名: Submillimeter array (CO)-C-12 (J=3-2) interferometric observations of the central region of M51
作者: Matsushita, S; Sakamoto, K; Kuo, CY; Hsieh, PY; Trung, DV; Mao RuiQing(毛瑞青); Iono, D; Peck, AB; Wiedner, MC; Liu, SY; Ohashi, N; Lim, J
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2004-11-20
卷号: 616, 期号:1, 页码:L55-L58
关键词: galaxies : individual (M51, NGC 5194) ; galaxies : ISM ; galaxies : nuclei ; galaxies : Seyfert ; ISM : jets and outflows
文章类型: Article
英文摘要: We present the first interferometric (CO)-C-12 (J = 3-2) observations (beam size of 3."9 x 1."6 or 160 x 65 pc) with the Submillimeter Array (SMA) toward the center of the Seyfert 2 galaxy M51. The image shows a strong concentration at the nucleus and weak emission from the spiral arm to the northwest. The integrated intensity of the central component in (CO)-C-12 (J = 3-2) is almost twice as high as that in (CO)-C-12 (J = 1-0), indicating that the molecular gas within an similar to80 pc radius of the nucleus is warm (greater than or similar to100 K) and dense (similar to10(4) cm(-3)). Similar intensity ratios are seen in shocked regions in our Galaxy, suggesting that these gas properties may be related to active galactic nucleus or starburst activity. The central component shows a linear velocity gradient (similar to1.4 km s(-1) pc(-1)) perpendicular to the radio continuum jet, similar to that seen in previous observations and interpreted as a circumnuclear molecular disk/torus around the Seyfert 2 nucleus. In addition, we identify a linear velocity gradient (0.7 km s(-1) pc(-1)) along the jet. Judging from the energetics, the velocity gradient can be explained by supernova explosions or energy and momentum transfer from the jet to the molecular gas via interaction, which is consistent with the high-intensity ratio.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DENSE MOLECULAR GAS ; NEARBY GALAXIES ; SPIRAL GALAXIES ; ACTIVE NUCLEUS ; STAR-FORMATION ; CO ; EMISSION ; NGC-1068 ; KINEMATICS ; EXCITATION
收录类别: SCI
语种: 英语
WOS记录号: WOS:000225199800014
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15842
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan
2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
3.Natl Taiwan Normal Univ, Dept Phys, Taipei 116, Taiwan
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
5.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
6.Univ Cologne, Inst Phys, D-50937 Cologne, Germany
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