PMO OpenIR  > 星系中的恒星形成研究团组
The star formation rate and dense molecular gas in galaxies
Gao, Y; Solomon, PM
2004-05-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume606Issue:1Pages:271-290
AbstractHCN luminosity is a tracer of dense molecular gas, n(H(2)) greater than or similar to3 x 10(4) cm(-3), associated with star-forming giant molecular cloud (GMC) cores. We present the results and analysis of our survey of HCN emission from 65 infrared galaxies, including nine ultraluminous infrared galaxies (ULIGs, L(IR) greater than or similar to 10(12) L(circle dot)), 22 luminous infrared galaxies (LIGs, 10(11) L(circle dot) < L(IR) less than or similar to 10(12) L(circle dot)), and 34 normal spiral galaxies with lower IR luminosity (most are large spiral galaxies). We have measured the global HCN line luminosity, and the observations are reported in Paper I. This paper analyzes the relationships between the total far-IR luminosity (a tracer of the star formation rate), the global HCN line luminosity (a measure of the total dense molecular gas content), and the CO luminosity (a measure of the total molecular content). We find a tight linear correlation between the IR and HCN luminosities L(IR) and L(HCN) (in the log-log plot) with a correlation coefficient R = 0.94, and an almost constant average ratio L(IR)/L(HCN) = 900 L(circle dot) (K km s(-1) pc(2))(-1). The IR-HCN linear correlation is valid over 3 orders of magnitude including ULIGs, the most luminous objects in the local universe. The direct consequence of the linear IR-HCN correlation is that the star formation law in terms of dense molecular gas content has a power-law index of 1.0. The global star formation rate is linearly proportional to the mass of dense molecular gas in normal spiral galaxies, LIGs, and ULIGs. This is strong evidence in favor of star formation as the power source in ultraluminous galaxies since the star formation in these galaxies appears to be normal and expected given their high mass of dense star-forming molecular gas.
KeywordGalaxies : Ism Galaxies : Starburst Infrared : Galaxies Ism : Molecules Radio Lines : Galaxies
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordULTRALUMINOUS INFRARED GALAXIES ; NEARBY GALAXIES ; BRIGHT GALAXIES ; CO EMISSION ; EXTENDED DISTRIBUTION ; FORMATION EFFICIENCY ; PHYSICAL CONDITIONS ; STARBURST GALAXIES ; EXTERNAL GALAXIES ; IRAS OBSERVATIONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000220925800022
Citation statistics
Cited Times:606[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7758
Collection星系中的恒星形成研究团组
Affiliation1.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
Recommended Citation
GB/T 7714
Gao, Y,Solomon, PM. The star formation rate and dense molecular gas in galaxies[J]. ASTROPHYSICAL JOURNAL,2004,606(1):271-290.
APA Gao, Y,&Solomon, PM.(2004).The star formation rate and dense molecular gas in galaxies.ASTROPHYSICAL JOURNAL,606(1),271-290.
MLA Gao, Y,et al."The star formation rate and dense molecular gas in galaxies".ASTROPHYSICAL JOURNAL 606.1(2004):271-290.
Files in This Item:
File Name/Size DocType Version Access License
2004047The star form(584KB) 开放获取LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Gao, Y]'s Articles
[Solomon, PM]'s Articles
Baidu academic
Similar articles in Baidu academic
[Gao, Y]'s Articles
[Solomon, PM]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Gao, Y]'s Articles
[Solomon, PM]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2004047The star formation rate and dense molecular gas in galaxies .pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.