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题名: HCN survey of normal spiral, infrared-luminous, and ultraluminous galaxies
作者: Gao Yu(高煜); Solomon, PM
刊名: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期: 2004-05-01
卷号: 152, 期号:1, 页码:63-80
关键词: galaxies : ISM ; galaxies : starburst ; infrared : galaxies ; ISM : molecules ; radio lines : galaxies ; surveys
文章类型: Article
英文摘要: We report systematic HCN J = 1 - 0 ( and CO) observations of a sample of 53 infrared (IR) and/or CO-bright and/or luminous galaxies, including seven ultraluminous infrared galaxies, nearly 20 luminous infrared galaxies, and more than a dozen of the nearest normal spiral galaxies. This is the largest and most sensitive HCN survey of galaxies to date. All galaxies observed so far follow the tight correlation between the IR luminosity L-IR and the HCN luminosity L-HCN initially proposed by Solomon, Downes, & Radford, which is detailed in a companion paper. We also address here the issue of HCN excitation. There is no particularly strong correlation between L-HCN and the 12 mum luminosity; in fact, of all the four IRAS bands, the 12 mum luminosity has the weakest correlation with the HCN luminosity. There is also no evidence of stronger HCN emission or a higher ratio of HCN and CO luminosities L-HCN/L-CO for galaxies with excess 12 mum emission. This result implies that mid-IR radiative pumping, or populating, of the J = 1 level of HCN by a mid-IR vibrational transition is not important compared with the collisional excitation by dense molecular hydrogen. Furthermore, large velocity gradient calculations justify the use of HCN J = 1 - 0 emission as a tracer of high-density molecular gas (greater than or similar to3 x 10(4)/tau cm(-3)) and give an estimate of the mass of dense molecular gas from HCN observations. Therefore, L-HCN may be used as a measure of the total mass of dense molecular gas, and the luminosity ratio L-HCN/L-CO may indicate the fraction of molecular gas that is dense.
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 ; STAR-FORMATION ; NEARBY GALAXIES ; GALACTIC-CENTER ; INTERSTELLAR-MEDIUM ; STARBURST NUCLEUS ; BRIGHT GALAXIES ; CENTRAL REGION ; LINE EMISSION ; IRAS GALAXIES
收录类别: SCI
语种: 英语
WOS记录号: WOS:000220925700003
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15843
Appears in Collections:星系中的恒星形成研究团组_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.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA
3.CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA
4.SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
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