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STAR FORMATION RELATIONS AND CO SPECTRAL LINE ENERGY DISTRIBUTIONS ACROSS THE J-LADDER AND REDSHIFT
Greve, T. R.1; Leonidaki, I.2; Xilouris, E. M.2; Weiss, A.3; Zhang, Z. -Y.4,5; van der Werf, P.6; Aalto, S.7; Armus, L.8; Diaz-Santos, T.8; Evans, A. S.9,10; Fischer, J.11; Gao, Y.12; Gonzalez-Alfonso, E.13; Harris, A.14; Henkel, C.3,15; Meijerink, R.6; Naylor, D. A.16; Smith, H. A.17; Spaans, M.18; Stacey, G. J.19; Veilleux, S.14; Walter, F.20
2014-10-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume794Issue:2Pages:142-142
AbstractWe present FIR [50-300 mu m]-CO luminosity relations (i.e., log L-FIR = alpha log L'(CO) + beta) for the full CO rotational ladder from J = 1-0 up to J = 13-12 for a sample of 62 local (z <= 0.1) (Ultra) Luminous InfraredGalaxies (LIRGs; LIR[8-1000 mu m] > 10(11) L-circle dot) using data from Herschel SPIRE-FTS and ground-based telescopes. We extend our sample to high redshifts (z > 1) by including 35 submillimeter selected dusty star forming galaxies from the literature with robust CO observations, and sufficiently well-sampled FIR/submillimeter spectral energy distributions (SEDs), so that accurate FIR luminosities can be determined. The addition of luminous starbursts at high redshifts enlarge the range of the FIR-CO luminosity relations toward the high-IR-luminosity end, while also significantly increasing the small amount of mid-J/high-J CO line data (J = 5-4 and higher) that was available prior to Herschel. This new data set (both in terms of IR luminosity and J-ladder) reveals linear FIR-CO luminosity relations (i.e., a similar or equal to 1) for J = 1-0 up to J = 5-4, with a nearly constant normalization (beta similar to 2). In the simplest physical scenario, this is expected from the (also) linear FIR-(molecular line) relations recently found for the dense gas tracer lines (HCN and CS), as long as the dense gas mass fraction does not vary strongly within our (merger/starburst)-dominated sample. However, from J = 6-5 and up to the J = 13-12 transition, we find an increasingly sublinear slope and higher normalization constant with increasing J. We argue that these are caused by a warm (similar to 100 K) and dense (>10(4) cm(-3)) gas component whose thermal state is unlikely to be maintained by star-formation-powered far-UV radiation fields (and thus is no longer directly tied to the star formation rate). We suggest that mechanical heating (e.g., supernova-driven turbulence and shocks), and not cosmic rays, is the more likely source of energy for this component. The global CO spectral line energy distributions, which remain highly excited from J = 6-5 up to J = 13-12, are found to be a generic feature of the (U)LIRGs in our sample, and further support the presence of this gas component.
KeywordGalaxies: Evolution Galaxies: Formation Galaxies: Ism Galaxies: Starburst Ism: Molecules
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/794/2/142
WOS KeywordULTRALUMINOUS INFRARED GALAXIES ; DENSE MOLECULAR GAS ; LENSED SUBMILLIMETER GALAXIES ; HERSCHEL-SPIRE SPECTROSCOPY ; FREE-FREE EMISSION ; FORMING GALAXIES ; INTERSTELLAR-MEDIUM ; NEARBY GALAXIES ; STARBURST GALAXY ; FORMATION LAW
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000343085800046
Citation statistics
Cited Times:67[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10688
Collection星系中的恒星形成研究团组
Affiliation1.UCL, Dept Phys & Astron, London WC1E 6BT, England
2.Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, GR-15236 Penteli, Greece
3.Max Planck Inst Radioastron, D-53121 Bonn, Germany
4.Royal Observ, UK Astron Technol Ctr, Sci & Technol Facil Council, Edinburgh EH9 3HJ, Midlothian, Scotland
5.European So Observ, D-85748 Garching, Germany
6.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
7.Chalmers, Dept Earth & Space Sci, Onsala Observ, S-43994 Onsala, Sweden
8.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
9.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
10.Natl Radio Astron Observ, Charlottesville, VA 22903 USA
11.Naval Res Lab, Remote Sensing Div, Washington, DC 20375 USA
12.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
13.Univ Alcala de Henares, Dept Fs, E-28871 Alcala De Henares, Spain
14.Univ Maryland, Dept Astron, College Pk, MD 20742 USA
15.King Abdulaziz Univ, Dept Astron, Jeddah 21589, Saudi Arabia
16.Univ Lethbridge, Inst Space Imaging Sci, Dept Phys & Astron, Lethbridge, AB T1K 3M4, Canada
17.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
18.Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands
19.Cornell Univ, Dept Astron, Ithaca, NY 1485 USA
20.Max Planck Inst Astron, D-691117 Heidelberg, Germany
Recommended Citation
GB/T 7714
Greve, T. R.,Leonidaki, I.,Xilouris, E. M.,et al. STAR FORMATION RELATIONS AND CO SPECTRAL LINE ENERGY DISTRIBUTIONS ACROSS THE J-LADDER AND REDSHIFT[J]. ASTROPHYSICAL JOURNAL,2014,794(2):142-142.
APA Greve, T. R..,Leonidaki, I..,Xilouris, E. M..,Weiss, A..,Zhang, Z. -Y..,...&Walter, F..(2014).STAR FORMATION RELATIONS AND CO SPECTRAL LINE ENERGY DISTRIBUTIONS ACROSS THE J-LADDER AND REDSHIFT.ASTROPHYSICAL JOURNAL,794(2),142-142.
MLA Greve, T. R.,et al."STAR FORMATION RELATIONS AND CO SPECTRAL LINE ENERGY DISTRIBUTIONS ACROSS THE J-LADDER AND REDSHIFT".ASTROPHYSICAL JOURNAL 794.2(2014):142-142.
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