ALMA [N ii] 205 μm Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7**The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

doi:10.3847/2041-8213/aa77fc

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	ALMA [N ii] 205 μm Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7**The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
	Lu,Nanyao 2,3; Zhao,Yinghe 4,5,6; Díaz-Santos,Tanio 7; Xu,C. Kevin 2,3; Charmandaris,Vassilis 8,9; Gao,Yu 10; van der Werf,Paul P.11; Privon,George C.12,13; Inami,Hanae 14; Rigopoulou,Dimitra 15
刊名	The Astrophysical Journal Letters
	2017-06-19
卷号	842 期号:2
关键词	galaxies: active galaxies: ISM galaxies: star formation infrared: galaxies ISM: molecules submillimeter: galaxies
ISSN号	2041-8205
DOI	10.3847/2041-8213/aa77fc
英文摘要	Abstract We present the results from Atacama Large Millimeter/submillimeter Array imaging in the [N ii] 205μm fine-structure line (hereafter [N ii]) and the underlying continuum of BRI 1202-0725, an interacting galaxy system at z?=?4.7, consisting of a quasi-stellar object (QSO), a submillimeter galaxy (SMG), and two Lyα emitters, all within ～25 kpc of the QSO. We detect the QSO and SMG in both [N ii] and continuum. At the ～1″ (or 6.6 kpc) resolution, both the QSO and SMG are resolved in [N ii], with the de-convolved major axes of ～9 and ～14 kpc, respectively. In contrast, their continuum emissions are much more compact and unresolved even at an enhanced resolution of ～0.″7. The ratio of the [N ii] flux to the existing CO(7?6) flux is used to constrain the dust temperature (Tdust) for a more accurate determination of the FIR luminosity LFIR. Our best estimated Tdust equals 43 (±2) K for both galaxies (assuming an emissivity index β = 1.8). The resulting LCO(7?6)/LFIR ratios are statistically consistent with that of local luminous infrared galaxies, confirming that LCO(7?6) traces the star formation (SF) rate (SFR) in these galaxies. We estimate that the ongoing SF of the QSO (SMG) has an SFR of 5.1 (6.9)?×?103 M⊙ yr?1 (±30%) assuming Chabrier initial mass function, takes place within a diameter (at half maximum) of 1.3 (1.5) kpc, and will consume the existing 5 (5)?×?1011 M⊙ of molecular gas in 10 (7)?×?107 years.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:2041-8205-842-2-AA77FC
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35993]
专题	中国科学院国家天文台
作者单位	1.University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 2.National Astronomical Observatories, Chinese Academy of Sciences (CAS), Beijing 100012, China; nanyao.lu@gmail.com 3.China-Chile Joint Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 6.Center for Astronomical Mega-Science, CAS, 20A Datun Road, Chaoyang District, Beijing 100012, China 7.Nucleo de Astronomia de la Facultad de Ingenieria, Universidad Diego Portales, Av. Ejercito Libertador 441, Santiago, Chile 8.Department of Physics, University of Crete, GR-71003 Heraklion, Greece 9.IAASARS, National Observatory of Athens, GR-15236, Penteli, Greece 10.Purple Mountain Observatory, CAS, Nanjing 210008, China
推荐引用方式 GB/T 7714	Lu,Nanyao,Zhao,Yinghe,Díaz-Santos,Tanio,et al. ALMA [N ii] 205 μm Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7**The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.[J]. The Astrophysical Journal Letters,2017,842(2).
APA	Lu,Nanyao.,Zhao,Yinghe.,Díaz-Santos,Tanio.,Xu,C. Kevin.,Charmandaris,Vassilis.,...&Zhu,Lei.(2017).ALMA [N ii] 205 μm Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7**The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc..The Astrophysical Journal Letters,842(2).
MLA	Lu,Nanyao,et al."ALMA [N ii] 205 μm Imaging Spectroscopy of the Interacting Galaxy System BRI 1202-0725 at Redshift 4.7**The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.".The Astrophysical Journal Letters 842.2(2017).