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MEASURING STAR FORMATION RATES AND FAR-INFRARED COLORS OF HIGH-REDSHIFT GALAXIES USING THE CO(7-6) AND [N II] 205 mu m LINES
Lu, Nanyao1; Zhao, Yinghe1,2,3; Xu, C. Kevin1; Gao, Yu2,3; 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
2015-03-20
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号802期号:1页码:L11
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.
文章类型Article
关键词Galaxies: Active Galaxies: Ism Galaxies: Star Formation Infrared: Galaxies Ism: Molecules Submillimeter: Galaxies
WOS标题词Science & Technology ; Physical Sciences
学科领域天文和天体物理
DOI10.1088/2041-8205/802/1/L11
关键词[WOS]SUBMILLIMETER GALAXY ; STARBURST GALAXY ; MOLECULAR GAS ; GOALS SAMPLE ; C II ; EMISSION ; DUST ; ALMA ; SPECTROMETER ; DISKS
收录类别SCI
语种英语
资助项目PMO_LIB-IR
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000351739800011
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/14912
专题行星科学与深空探测实验室
太阳活动的多波段观测研究团组
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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Lu, Nanyao,Zhao, Yinghe,Xu, C. Kevin,et al. MEASURING STAR FORMATION RATES AND FAR-INFRARED COLORS OF HIGH-REDSHIFT GALAXIES USING THE CO(7-6) AND [N II] 205 mu m LINES[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,802(1):L11.
APA Lu, Nanyao.,Zhao, Yinghe.,Xu, C. Kevin.,Gao, Yu.,Diaz-Santos, Tanio.,...&Van Der Werf, Paul P..(2015).MEASURING STAR FORMATION RATES AND FAR-INFRARED COLORS OF HIGH-REDSHIFT GALAXIES USING THE CO(7-6) AND [N II] 205 mu m LINES.ASTROPHYSICAL JOURNAL LETTERS,802(1),L11.
MLA Lu, Nanyao,et al."MEASURING STAR FORMATION RATES AND FAR-INFRARED COLORS OF HIGH-REDSHIFT GALAXIES USING THE CO(7-6) AND [N II] 205 mu m LINES".ASTROPHYSICAL JOURNAL LETTERS 802.1(2015):L11.
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