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题名: MEASURING STAR FORMATION RATES AND FAR-INFRARED COLORS OF HIGH-REDSHIFT GALAXIES USING THE CO(7-6) AND [N II] 205 mu m LINES
作者: Lu, Nanyao1; Zhao YingHe(赵应和)1, 2, 3; Xu, C. Kevin1; Gao Yu(高煜)2, 3; Diaz-Santos, Tanio4, 5; Charmandaris, Vassilis6, 7, 8; Inami, Hanae9; Howell, Justin1; Liu, Lijie2, 10; Armus, Lee4; Mazzarella, Joseph M.1; Privon, George C.11; Lord, Steven D.12; Sanders, David B.13; Schulz, Bernhard1; Van Der Werf, Paul P.14
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2015-03-20
卷号: 802, 期号:1, 页码:L11
关键词: galaxies: active ; galaxies: ISM ; galaxies: star formation ; infrared: galaxies ; ISM: molecules ; submillimeter: galaxies
学科分类: 天文和天体物理
DOI: 10.1088/2041-8205/802/1/L11
文章类型: Article
英文摘要: To better characterize the global star formation activity in a galaxy, one needs to know not only the star formation rate (SFR) but also the rest-frame, far-infrared color (e. g., the60-100 mu m color, C(60/100)) of the dust emission. The latter probes the average intensity of the dust heating radiation field and scales statistically with the effective SFR surface density in star-forming galaxies including (ultra-) luminous infrared galaxies ((U) LIRGs). To this end, here we exploit a new spectroscopic approach involving only two emission lines: CO(7-6) at 372 mu m and [N II] at 205 mu m([ N II](205 mu m)). For local (U) LIRGs, the ratios of the CO(7-6) luminosity (LCO(7-6)) to the total infrared luminosity (L-IR; 8-1000 mu m) are fairly tightly distributed (to within similar to 0.12 dex) and show little dependence on C (60/100). This makes LCO(7-6) a good SFR tracer, which is less contaminated by active galactic nuclei than L-IR and may also be much less sensitive to metallicity than LCO(1-0). Furthermore, the logarithmic [N II](205 mu m)/CO(7-6) luminosity ratio depends fairly strongly (at a slope of similar to-1.4) on C(60/100), with a modest scatter (similar to 0.23 dex). This makes it a useful estimator on C(60/100) with an implied uncertainty of similar to 0.15 (or less than or similar to 4 K in the dust temperature (T-dust) in the case of a graybody emission with T-dust greater than or similar to 30 K and a dust emissivity index beta >= 1). Our locally calibrated SFR and C(60/100) estimators are shown to be consistent with the published data of (U) LIRGs of z up to similar to 6.5.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: SUBMILLIMETER GALAXY ; STARBURST GALAXY ; MOLECULAR GAS ; GOALS SAMPLE ; C II ; EMISSION ; DUST ; ALMA ; SPECTROMETER ; DISKS
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000351739800011
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14912
Appears in Collections:行星科学与深空探测实验室_期刊论文
太阳活动的多波段观测研究团组_期刊论文

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作者单位: 1.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
4.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
5.Univ Diego Port, Nucl Astron Fac Ingn, Santiago, Chile
6.Univ Crete, Dept Phys, GR-71003 Iraklion, Greece
7.IAASARS, Natl Observ Athens, GR-15236 Penteli, Greece
8.Observ Paris, Chercheur Associe, F-75014 Paris, France
9.Natl Opt Astron Observ, Tucson, AZ 85719 USA
10.Max Planck Inst Radioastron, D-53121 Bonn, Germany
11.Univ Concepcion, Dept Astron, Concepcion, Chile
12.SETI Inst, Mountain View, CA 94043 USA
13.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
14.Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
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