Probing the Full CO Spectral Line Energy Distribution (SLED) in the Nuclear Region of a Quasar-starburst System at z=6.003
Li, Jianan1,2; Wang, Ran2; Riechers, Dominik3,4; Walter, Fabian4; Decarli, Roberto5; Venamans, Bram P.4; Neri, Roberto6; Shao, Yali1,2; Fan, Xiaohui7; Gao, Yu8,9,16; Carilli, Chris L.10,11; Omont, Alain12; Cox, Pierre12; Menten, Karl M.13; Wagg, Jeff14; Bertoldi, Frank15; Narayanan, Desika17

We report Atacama Large Millimeter/submillimeter Array observations of CO(8-7), (9-8), H2O(2(0,2)-1(1,1)), and OH+(1(1)-0(1)) and NOrthern Extended Millimeter Array observations of CO(5-4), (6-5), (12-11), and (13-12) toward the z.=.6.003 quasar SDSS J231038.88+185519.7, aiming to probe the physical conditions of the molecular gas content of this source. We present the best sampled CO spectral line energy distribution (SLED) at z.=.6.003, and analyzed it with the radiative transfer code MOLPOP-CEP. Fitting the CO SLED to a one-component model indicates a kinetic temperature T-kin=.228 K, molecular gas density log(n(H-2) cm(-3)).=.4.75, and CO column density log(N (CO) cm(-2)) = 17.5; although, a two-component model better fits the data. In either case, the CO SLED is dominated by a "warm" and "dense" component. Compared to samples of local (Ultra) Luminous Infrared Galaxies, starburst galaxies, and high-redshift submillimeter galaxies, J2310+1855 exhibits higher CO excitation at (J >= 8), like other high-redshift quasars. The high CO excitation, together with the enhanced L-H2O/L-IR, L-H2O/L-CO, and LOH+/L-H2O ratios, suggests that besides the UV radiation from young massive stars, other mechanisms such as shocks, cosmic-rays, and X-rays might also be responsible for the heating and ionization of the molecular gas. In the nuclear region probed by the molecular emissions lines, any of these mechanisms might be present due to the powerful quasar and the starburst activity.

Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000524909200001
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Document Type期刊论文
Corresponding AuthorWang, Ran
Affiliation1.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
3.Cornell Univ, Dept Astron, Space Sci Bldg, Ithaca, NY 14853 USA
4.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
5.INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy
6.Inst Radioastron Millimetr, F-38406 St Martin Dheres, France
7.Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA
8.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210033, Peoples R China
9.Chinese Acad Sci, Key Lab Radio Astron, 10 Yuanhua Rd, Nanjing 210033, Peoples R China
10.Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
11.Natl Radio Astron Observ, Socorro, NM 87801 USA
12.Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France
13.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
14.SKA Org, Lower Withington Maccles SK11 9DL, Cheshire, England
15.Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
16.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
17.Univ Florida, Dept Astron, 211 Bryant Space Sci Ctr, Gainesville, FL 32611 USA
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Li, Jianan,Wang, Ran,Riechers, Dominik,et al. Probing the Full CO Spectral Line Energy Distribution (SLED) in the Nuclear Region of a Quasar-starburst System at z=6.003[J]. ASTROPHYSICAL JOURNAL,2020,889(2):15.
APA Li, Jianan.,Wang, Ran.,Riechers, Dominik.,Walter, Fabian.,Decarli, Roberto.,...&Narayanan, Desika.(2020).Probing the Full CO Spectral Line Energy Distribution (SLED) in the Nuclear Region of a Quasar-starburst System at z=6.003.ASTROPHYSICAL JOURNAL,889(2),15.
MLA Li, Jianan,et al."Probing the Full CO Spectral Line Energy Distribution (SLED) in the Nuclear Region of a Quasar-starburst System at z=6.003".ASTROPHYSICAL JOURNAL 889.2(2020):15.
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