PMO OpenIR  > 星系中的恒星形成研究团组
The molecular gas in luminous infrared galaxies - I. CO lines, extreme physical conditions and their drivers
Papadopoulos, Padelis P.1; van der Werf, Paul P.2,3; Xilouris, E. M.4; Isaak, K. G.5; Gao, Yu6; Muehle, S.7
2012-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume426Issue:4Pages:2601-2629
AbstractWe report results from a large molecular line survey of luminous infrared galaxies (L-IR greater than or similar to 10(11) L-circle dot) in the local Universe (z less than or similar to 0.1), conducted during the last decade with the James Clerk Maxwell Telescope and the IRAM 30-m telescope. This work presents the CO and 13CO line data for 36 galaxies, further augmented by multi-J total CO line luminosities available for other infrared (IR) bright galaxies from the literature. This yields a combined sample of N = 70 galaxies with the star formation (SF) powered fraction of their IR luminosities spanning L-IR((+))similar to(10(10)-2 x10(12))L-circle dot and a wide range of morphologies. Simple comparisons of their available CO spectral line energy distributions (SLEDs) with local ones, as well as radiative transfer models, discern a surprisingly wide range of average interstellar medium (ISM) conditions, with most of the surprises found in the high-excitation regime. These take the form of global CO SLEDs dominated by a very warm (T-kin greater than or similar to 100 K) and dense (n >= 10(4) cm(-3)) gas phase, involving galaxy-sized (similar to(few) x 10(9) M-circle dot) gas mass reservoirs under conditions that are typically found only for similar to(13) per cent of mass per typical SF molecular cloud in the Galaxy. Furthermore, some of the highest excitation CO SLEDs are found in ultraluminous infrared galaxies (ULIRGs; L-IR >= 10(12)L(circle dot)) and surpass even those found solely in compact SF-powered hot spots in Galactic molecular clouds. Strong supersonic turbulence and high cosmic ray energy densities rather than far-ultraviolet/optical photons or supernova remnant induced shocks from individual SF sites can globally warm the large amounts of dense gas found in these merger-driven starbursts and easily power their extraordinary CO line excitation. This exciting possibility can now be systematically investigated with Herschel and the Atacama Large Milimeter Array (ALMA). As expected for an IR-selected (and thus SF rate selected) galaxy sample, only few cold CO SLEDs are found, and for fewer still a cold low/moderate-density and gravitationally bound state (i.e. Galactic type) emerges as the most likely one. The rest remain compatible with a warm and gravitationally unbound low-density phase often found in ULIRGs. Such degeneracies, prominent when only the low-J SLED segment (J = 10, 21 and 32) is available, advise against using its CO line ratios and the so-called X-co = M(H-2)/L-co(10) factor as SF mode indicators, a practice that may have led to the misclassification of the ISM environments of IR-selected gas-rich discs in the distant Universe. Finally, we expect that the wide range of ISM conditions found among LIRGs will strongly impact the X-co factor, an issue we examine in detail in Paper II.
KeywordCosmic Rays Ism: Molecules Galaxies: Ism Galaxies: Starburst Infrared: Galaxies Radio Lines: Ism
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1365-2966.2012.21001.x
WOS KeywordACTIVE GALACTIC NUCLEI ; NEARBY SPIRAL GALAXIES ; STAR-FORMING GALAXIES ; RAY DOMINATED REGIONS ; INTERSTELLAR-MEDIUM ; DENSE GAS ; IRAS GALAXIES ; STARBURST GALAXIES ; SEYFERT-GALAXIES ; ULTRALUMINOUS GALAXIES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000310064400001
Citation statistics
Cited Times:101[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8067
Collection星系中的恒星形成研究团组
Affiliation1.Max Planck Inst Radioastron, D-53121 Bonn, Germany
2.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
3.Univ Edinburgh, Royal Observ, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland
4.Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens 15236, Greece
5.European Space Agcy, Res & Sci Support Dept, NL-2200 AG Noordwijk, Netherlands
6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
7.Argelander Inst Astron, D-53121 Bonn, Germany
Recommended Citation
GB/T 7714
Papadopoulos, Padelis P.,van der Werf, Paul P.,Xilouris, E. M.,et al. The molecular gas in luminous infrared galaxies - I. CO lines, extreme physical conditions and their drivers[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,426(4):2601-2629.
APA Papadopoulos, Padelis P.,van der Werf, Paul P.,Xilouris, E. M.,Isaak, K. G.,Gao, Yu,&Muehle, S..(2012).The molecular gas in luminous infrared galaxies - I. CO lines, extreme physical conditions and their drivers.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,426(4),2601-2629.
MLA Papadopoulos, Padelis P.,et al."The molecular gas in luminous infrared galaxies - I. CO lines, extreme physical conditions and their drivers".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 426.4(2012):2601-2629.
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