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题名: HIGH-J CO VERSUS FAR-INFRARED RELATIONS IN NORMAL AND STARBURST GALAXIES
作者: Liu, Daizhong1, 2, 3; Gao Yu(高煜)1; Isaak, Kate4; Daddi, Emanuele3; Yang, Chentao1, 2, 5; Lu, Nanyao6; van der Werf, Paul7
刊名: Astrophysical Journal Letters
出版日期: 2015-09-10
卷号: 810, 期号:2
关键词: galaxies: ISM ; galaxies: starburst ; infrared: ISM ; ISM: molecules
DOI: 10.1088/2041-8205/810/2/L14
文章类型: Article
英文摘要: We present correlations between 9 CO transitions (J = 4-3 to 12-11) and beam-matched far-infrared (far-IR) luminosities (L-FIR,L-b) among 167 local galaxies, using Herschel Spectral and Photometric Imaging Receiver. Fourier Transform Spectrometer (SPIRE; FTS) spectroscopic data and Photoconductor Array Camera and Spectrometer (PACS) photometry data. We adopt entire-galaxy FIR luminosities (L-FIR,L-e) from the IRAS Revised Bright Galaxy Sample and correct to L-FIR,L-b using PACS images to match the varying FTS beam sizes. All 9 correlations between L-CO' and L-FIR,L-b are essentially linear and tight (sigma = 0.2-0.3 dex dispersion), even for the highest transition, J = 12-11. This supports the notion that the star formation rate (SFR) is linearly correlated with the dense molecular gas (n(H2) greater than or similar to 10(4-6) cm(-3)). We divide the entire sample into three subsamples and find that smaller sample sizes can induce large differences in the correlation slopes. We also derive an average CO spectral line energy distribution for the entire sample and discuss the implied average molecular gas properties for these local galaxies. We further extend our sample to high-z galaxies with CO(J = 5-4) data from the literature as an example, including submillimeter galaxies (SMGs) and "normal" star-forming BzKs. BzKs have similar FIR/CO(5-4) ratios as those of local galaxies, and agreeably follow the locally-determined correlation, whereas SMG ratios fall around or slightly above the local correlation with large uncertainties. Finally, by including Galactic CO(J = 10-9) data as well as very limited high-z CO(J = 10-9) data, we verify that the CO(J = 10-9)-FIR correlation successfully extends to Galactic young stellar objects, suggesting that linear correlations are valid over 15 orders of magnitude.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STAR-FORMATION RATE ; LUMINOUS SUBMILLIMETER GALAXIES ; HIGH-REDSHIFT GALAXIES ; WARM MOLECULAR GAS ; NEARBY GALAXIES ; FORMATION LAWS ; RADIO-CONTINUUM ; HERSCHEL ; LINE ; TRACERS
收录类别: SCI
项目资助者: NSFC(11173059 ; CAS(XDB09000000) ; 11390373 ; 11420101002)
语种: 英语
WOS记录号: WOS:000364340000001
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16063
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Radio Astron, Nanjing, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Univ Paris Diderot, CNRS, CEA Saclay, Lab AIM,IRFU SAp, F-91191 Gif Sur Yvette, France
4.ESTEC SRE S, Sci Support Off, NL-2201 AZ Noordwijk, Netherlands
5.Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France
6.CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA
7.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
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