STAR FORMATION RELATIONS AND CO SPECTRAL LINE ENERGY DISTRIBUTIONS ACROSS THE J-LADDER AND REDSHIFT
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-10-20 |
| 卷号 | 794期号:2页码:142-142 |
| 关键词 | galaxies: evolution galaxies: formation galaxies: ISM galaxies: starburst ISM: molecules |
| ISSN号 | 0004-637X |
| 英文摘要 | We 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ULTRALUMINOUS INFRARED GALAXIES ; DENSE MOLECULAR GAS ; LENSED SUBMILLIMETER GALAXIES ; HERSCHEL-SPIRE SPECTROSCOPY ; FREE-FREE EMISSION ; FORMING GALAXIES ; INTERSTELLAR-MEDIUM ; NEARBY GALAXIES ; STARBURST GALAXY ; FORMATION LAW |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000343085800046 |
| 公开日期 | 2014-11-21 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10688]  |
| 专题 | 紫金山天文台_星系中的恒星形成研究团组 |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：紫金山天文台
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