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MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES
Greve, T. R.1,2; Papadopoulos, P. P.3; Gao, Y.4; Radford, S. J. E.2
2009-02-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume692Issue:2Pages:1432-1446
AbstractWe report single-dish multitransition measurements of the (CO)-C-12, HCN, and HCO+ molecular line emission as well as HNC J = 1-0 and HNCO in the two ultraluminous IR galaxies Arp 220 and NGC 6240. Using this new molecular line inventory, in conjunction with existing data in the literature, we compiled the most extensive molecular line data sets to date for such galaxies. The many rotational transitions, with their different excitation requirements, allow the study of the molecular gas over a wide range of different densities and temperatures with significant redundancy, and thus allow good constraints on the properties of the dense gas in these two systems. The mass (similar to (1-2) x10(10)M(circle dot)) of dense gas (greater than or similar to 10(5-6) cm(-3)) found accounts for the bulk of their molecular gas mass, and is consistent with most of their IR luminosities powered by intense starbursts while self-regulated by O, B star cluster radiative pressure onto the star-forming dense molecular gas. The highly excited HCN transitions trace a gas phase similar to (10-100) x denser than that of the subthermally excited HCO+ lines (for both galaxies). These two phases are consistent with an underlying density-size power law found for Galactic giant molecular clouds (but with a steeper exponent), with HCN lines tracing denser and more compact regions than HCO+. Whether this is true in IR-luminous, star-forming galaxies in general remains to be seen, and underlines the need for observations of molecular transitions with high critical densities for a sample of bright (U) LIRGs in the local universe-a task for which the HI-FI instrument on board Herschel is ideally suited to do.
KeywordGalaxies: Individual (Arp 220, Ngc 6240) Galaxies: Starburst Ism: Molecules
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/692/2/1432
WOS KeywordULTRALUMINOUS INFRARED GALAXIES ; SPECTRAL ENERGY-DISTRIBUTION ; ACTIVE GALACTIC NUCLEUS ; HNC LINE EMISSION ; DENSE GAS ; ROTATIONAL-EXCITATION ; INTERSTELLAR-MEDIUM ; LUMINOUS GALAXIES ; PHYSICAL CONDITIONS ; THERMAL BALANCE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000263674700035
Citation statistics
Cited Times:114[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/1593
Collection星系中的恒星形成研究团组
Affiliation1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.CALTECH, Pasadena, CA 91125 USA
3.Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Greve, T. R.,Papadopoulos, P. P.,Gao, Y.,et al. MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES[J]. ASTROPHYSICAL JOURNAL,2009,692(2):1432-1446.
APA Greve, T. R.,Papadopoulos, P. P.,Gao, Y.,&Radford, S. J. E..(2009).MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES.ASTROPHYSICAL JOURNAL,692(2),1432-1446.
MLA Greve, T. R.,et al."MOLECULAR GAS IN EXTREME STAR-FORMING ENVIRONMENTS: THE STARBURSTS Arp 220 AND NGC 6240 AS CASE STUDIES".ASTROPHYSICAL JOURNAL 692.2(2009):1432-1446.
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