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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,Nanyao1,2; Zhao,Yinghe3,4,5; Díaz-Santos,Tanio6; Xu,C. Kevin1,2; Charmandaris,Vassilis7,8; Gao,Yu9; van der Werf,Paul P.10; Privon,George C.11,12; Inami,Hanae13; Rigopoulou,Dimitra14; Sanders,David B.15; Zhu,Lei1,2
2017-06-19
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume842Issue:2
AbstractAbstract 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.
Keywordgalaxies: active galaxies: ISM galaxies: star formation infrared: galaxies ISM: molecules submillimeter: galaxies
DOI10.3847/2041-8213/aa77fc
Language英语
WOS IDIOP:2041-8205-842-2-aa77fc
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23788
Collection中国科学院紫金山天文台
Affiliation1.National Astronomical Observatories, Chinese Academy of Sciences (CAS), Beijing 100012, China; nanyao.lu@gmail.com
2.China-Chile Joint Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
5.Center for Astronomical Mega-Science, CAS, 20A Datun Road, Chaoyang District, Beijing 100012, China
6.Nucleo de Astronomia de la Facultad de Ingenieria, Universidad Diego Portales, Av. Ejercito Libertador 441, Santiago, Chile
7.Department of Physics, University of Crete, GR-71003 Heraklion, Greece
8.IAASARS, National Observatory of Athens, GR-15236, Penteli, Greece
9.Purple Mountain Observatory, CAS, Nanjing 210008, China
10.Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
11.Departamento de Astronomía, Universidad de Concepción, Casilla 160-C, Concepción, Chile
12.Pontificia Universidad Católica de Chile, Instituto de Astrofisica, Casilla 306, Santiago 22, Chile
13.Centre de Recherche Astrophysique de Lyon (CRAL), Observatoire de Lyon, CNRS, UMR5574, F-69230, Saint-Genis-Laval, France
14.Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
15.University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
Recommended Citation
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).
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