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The `Red Radio Ring': ionized and molecular gas in a starburst/active galactic nucleus at z ~ 2.55

Artykuł
Czasopismo : MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Tom: 488, Zeszyt: 2, Strony: 1489-1500
Kevin C. Harrington [1] , [2] , A. Vishwas [3] , A. Weiss [4] , B. Magnelli [1] , L. Grasitelli [1] , Michal Zajacek [4] , [5] , [6] , E. F. Jimenez-Andrade [1] , [2] , T. K. D. Leung [3] , [7] , F. Bertoldi [1] , E. Romano-Diaz [1] , D. T. Frayer [8] , P. Kamieneski [10] , D. Riechers [3] , [9] , G. J. Stacey [3] , M. S. Yun [10] , Q. D. Wang [10]
  • [1]
    Argelander Institut fur Astronomie, Auf dem Huegel 71, 53121 Bonn, Germany
  • [2]
    International Max Planck Research School of Astronomy and Astrophysics at the Universities of Bonn and Cologne
  • [3]
    Department of Astronomy, Cornell University, Space Sciences Building, Ithaca, NY 14853, USA
  • [4]
    Max-Planck-Institut fur Radioastronomie (MPIfR), Auf dem Huegel 69, D-53121 Bonn, Germany
  • [5]
  • [6]
    I. Physikalisches Institut der Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln, Germany
  • [7]
    Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010, USA
  • [8]
    Green Bank Observatory, 155 Observatory Rd., Green Bank, West Virginia 24944, USA
  • [9]
    Max-Planck-Institut fur Astronomie, Koenigstuhl 17, D-69117 Heidelberg, Germany
  • [10]
    Department of Astronomy, University of Massachusetts, 619E Lederle Grad Research Tower, 710 N. Pleasant Street, Amherst, MA 01003, USA
2019-07-03 angielski
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  • Oryginalny artykuł naukowy
  • Zrecenzowana naukowo
Dyscypliny naukowe
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Astronomia , Fizyka
Abstrakty ( angielski )
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We report the detection of the far-infrared (FIR) fine-structure line of singly ionized nitrogen, [N II] 205 μm , within the peak epoch of galaxy assembly, from a strongly lensed galaxy, hereafter `The Red Radio Ring'; the RRR, at z = 2.55. We combine new observations of the ground-state and mid-J transitions of CO (Jup = 1, 5, 8), and the FIR spectral energy distribution (SED), to explore the multiphase interstellar medium (ISM) properties of the RRR. All line profiles suggest that the H II regions, traced by [N II] 205 μm , and the (diffuse and dense) molecular gas, traced by CO, are cospatial when averaged over kpc-sized regions. Using its mid-IR-to-millimetre (mm) SED, we derive a non-negligible dust attenuation of the [N II] 205 μm line emission. Assuming a uniform dust screen approximation results a mean molecular gas column density >1024 cm-2, with a molecular gas-to-dust mass ratio of 100. It is clear that dust attenuation corrections should be accounted for when studying FIR fine-structure lines in such systems. The attenuation corrected ratio of L_{N II}205} / L_{IR(8-1000 μ m)} = 2.7 × 10^{-4} is consistent with the dispersion of local and z > 4 SFGs. We find that the lower limit, [N II] 205 μm -based star formation rate (SFR) is less than the IR-derived SFR by a factor of 4. Finally, the dust SED, CO line SED, and L_{N {II}205} line-to-IR luminosity ratio of the RRR is consistent with a starburst-powered ISM.
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  2. Licencja: Creative Commons BY 3.0 PL
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