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题名: AN EXTRAGALACTIC (CO)-C-12 J=3-2 SURVEY WITH THE HEINRICH HERTZ TELESCOPE
作者: Mao RuiQing(毛瑞青)1, 2; Schulz, Andreas3, 4; Henkel, Christian2; Mauersberger, Rainer5; Muders, Dirk2; Dinh-V-Trung6, 7
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2010-12-01
卷号: 724, 期号:2, 页码:1336-1356
关键词: evolution ; galaxies: active ; galaxies: ISM ; galaxies: starburst ; ISM: molecules ; radio lines: galaxies ; surveys
DOI: 10.1088/0004-637X/724/2/1336
文章类型: Article
英文摘要: We present results of a (12)COJ= 3-2 survey of 125 nearby galaxies obtained with the 10 m Heinrich Hertz Telescope, with the aim to characterize the properties of warm and dense molecular gas in a large variety of environments. With an angular resolution of 22 '', (CO)-C-12 3-2 emission was detected in 114 targets. Based on 61 galaxies observed with equal beam sizes the (12)CO3-2/1-0 integrated line intensity ratio R-31 is found to vary from 0.2 to 1.9, with an average value of 0.81. No correlations are found for R-31 to Hubble-type and far-infrared luminosity. Possible indications for a correlation with inclination angle and the 60 mu m/100 mu m color temperature of the dust are not significant. Higher R-31 ratios than in "normal" galaxies, hinting at enhanced molecular excitation, may be found in galaxies hosting active galactic nuclei. Even higher average values are determined for galaxies with bars or starbursts, the latter being identified by the ratio of infrared luminosity versus isophotal area, log [(L-FIR/L-circle dot)/(D-25(2)/kpc(2))] > 7.25. (U)LIRGs are found to have the highest averaged R-31 value. This may be a consequence of particularly vigorous star formation activity, triggered by galaxy interaction and merger events. The nuclear CO luminosities are slightly sublinearly correlated with the global FIR luminosity in both the (12)COJ = 3-2 and the 1-0 lines. The slope of the log-log plots rises with compactness of the respective galaxy sub-sample, indicating a higher average density and a larger fraction of thermalized gas in distant luminous galaxies. While linear or sublinear correlations for the (CO)-C-12 J = 3-2 line can be explained, if the bulk of the observed J = 3-2 emission originates from the molecular gas with densities below the critical one, the case of the (CO)-C-12 J = 1-0 line with its small critical density remains a puzzle.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: EARLY-TYPE GALAXIES ; LUMINOUS INFRARED GALAXIES ; NEARBY SPIRAL GALAXIES ; DENSE MOLECULAR GAS ; STAR-FORMATION RATE ; DOUBLE-BARRED GALAXIES ; CO EMISSION ; VIRGO CLUSTER ; PHOTODISSOCIATION REGIONS ; ULTRALUMINOUS GALAXIES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000284149000039
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15946
Appears in Collections:分子云与恒星形成研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
3.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany
4.Univ Cologne, Inst Phys & Didakt, D-50931 Cologne, Germany
5.Joint ALMA Observ, Santiago, Chile
6.Acad Sinica, Inst Astron & Astrophys, Taipei 115, Taiwan
7.Vietnamese Acad Sci & Technol, Inst Phys, Ctr Quantum Elect, Hanoi, Vietnam
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