LUMINOUS INFRARED GALAXIES WITH THE SUBMILLIMETER ARRAY. IV. {sup 12}CO J = 6-5 OBSERVATIONS OF VV 114

Sliwa, Kazimierz; Wilson, Christine D.; Krips, Melanie; Petitpas, Glen R.; Iono, Daisuke; Juvela, Mika; Matsushita, Satoki; Peck, Alison; Yun, Min

doi:10.1088/0004-637X/777/2/126

Title: LUMINOUS INFRARED GALAXIES WITH THE SUBMILLIMETER ARRAY. IV. {sup 12}CO J = 6-5 OBSERVATIONS OF VV 114

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Abstract

We present high-resolution (∼2.''5) observations of {sup 12}CO J = 6-5 toward the luminous infrared galaxy VV 114 using the Submillimeter Array. We detect {sup 12}CO J = 6-5 emission from the eastern nucleus of VV 114 but do not detect the western nucleus or the central region. We combine the new {sup 12}CO J = 6-5 observations with previously published or archival low-J CO observations, which include {sup 13}CO J = 1-0 Atacama Large Millimeter/submillimeter Array cycle 0 observations, to analyze the beam-averaged physical conditions of the molecular gas in the eastern nucleus. We use the radiative transfer code RADEX and a Bayesian likelihood code to constrain the temperature (T{sub kin}), density (n{sub H{sub 2}}), and column density (N{sub {sup 1}{sup 2}CO}) of the molecular gas. We find that the most probable scenario for the eastern nucleus is a cold (T{sub kin} = 38 K), moderately dense (n{sub H{sub 2}} = 10{sup 2.89} cm{sup –3}) molecular gas component. We find that the most probable {sup 12}CO to {sup 13}CO abundance ratio ([{sup 12}CO]/[{sup 13}CO]) is 229, which is roughly three times higher than the Milky Way value. This high abundance ratio may explain the observed high {sup 12}CO/ {supmore »« less

Authors:

Sliwa, Kazimierz; Wilson, Christine D. ^[1]; Krips, Melanie ^[2]; Petitpas, Glen R. ^[3]; Iono, Daisuke ^[4]; Juvela, Mika ^[5]; Matsushita, Satoki ^[6]; Peck, Alison ^[7]; Yun, Min ^[8]

Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1 (Canada)
Institut de Radio Astronomie Millimetrique, 300 Rue de la Piscine, Domaine Universitaire, F-38406 Saint Martin d'Heres (France)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
Chile Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
University of Helsinki, FI-00014 Helsinki (Finland)
Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China)
National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States)

Publication Date:: Sun Nov 10 00:00:00 EST 2013

OSTI Identifier:: 22270582

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 777; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; CARBON 12; CARBON 13; CARBON MONOXIDE; DENSITY; EXCITATION; HYDROGEN; MICROWAVE RADIATION; RADIANT HEAT TRANSFER; RESOLUTION

Citation Formats


                    Sliwa, Kazimierz, Wilson, Christine D., Krips, Melanie, Petitpas, Glen R., Iono, Daisuke, Juvela, Mika, Matsushita, Satoki, Peck, Alison, and Yun, Min. LUMINOUS INFRARED GALAXIES WITH THE SUBMILLIMETER ARRAY. IV. {sup 12}CO J = 6-5 OBSERVATIONS OF VV 114.  United States: N. p., 2013. 
        Web.  doi:10.1088/0004-637X/777/2/126.

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                    Sliwa, Kazimierz, Wilson, Christine D., Krips, Melanie, Petitpas, Glen R., Iono, Daisuke, Juvela, Mika, Matsushita, Satoki, Peck, Alison, & Yun, Min. LUMINOUS INFRARED GALAXIES WITH THE SUBMILLIMETER ARRAY. IV. {sup 12}CO J = 6-5 OBSERVATIONS OF VV 114.  United States.  https://doi.org/10.1088/0004-637X/777/2/126

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                    Sliwa, Kazimierz, Wilson, Christine D., Krips, Melanie, Petitpas, Glen R., Iono, Daisuke, Juvela, Mika, Matsushita, Satoki, Peck, Alison, and Yun, Min. 2013.  
        "LUMINOUS INFRARED GALAXIES WITH THE SUBMILLIMETER ARRAY. IV. {sup 12}CO J = 6-5 OBSERVATIONS OF VV 114".  United States.  https://doi.org/10.1088/0004-637X/777/2/126.

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@article{osti_22270582,

  title        = {LUMINOUS INFRARED GALAXIES WITH THE SUBMILLIMETER ARRAY. IV. {sup 12}CO J = 6-5 OBSERVATIONS OF VV 114},

  author       = {Sliwa, Kazimierz and Wilson, Christine D. and Krips, Melanie and Petitpas, Glen R. and Iono, Daisuke and Juvela, Mika and Matsushita, Satoki and Peck, Alison and Yun, Min},

  abstractNote = {We present high-resolution (∼2.''5) observations of {sup 12}CO J = 6-5 toward the luminous infrared galaxy VV 114 using the Submillimeter Array. We detect {sup 12}CO J = 6-5 emission from the eastern nucleus of VV 114 but do not detect the western nucleus or the central region. We combine the new {sup 12}CO J = 6-5 observations with previously published or archival low-J CO observations, which include {sup 13}CO J = 1-0 Atacama Large Millimeter/submillimeter Array cycle 0 observations, to analyze the beam-averaged physical conditions of the molecular gas in the eastern nucleus. We use the radiative transfer code RADEX and a Bayesian likelihood code to constrain the temperature (T{sub kin}), density (n{sub H{sub 2}}), and column density (N{sub {sup 1}{sup 2}CO}) of the molecular gas. We find that the most probable scenario for the eastern nucleus is a cold (T{sub kin} = 38 K), moderately dense (n{sub H{sub 2}} = 10{sup 2.89} cm{sup –3}) molecular gas component. We find that the most probable {sup 12}CO to {sup 13}CO abundance ratio ([{sup 12}CO]/[{sup 13}CO]) is 229, which is roughly three times higher than the Milky Way value. This high abundance ratio may explain the observed high {sup 12}CO/ {sup 13}CO line ratio (>25). The unusual {sup 13}CO J = 2-1/J = 1-0 line ratio of 0.6 is produced by a combination of moderate {sup 13}CO optical depths (τ = 0.4-1.1) and extremely subthermal excitation temperatures. We measure the CO-to-H{sub 2} conversion factor, α{sub CO}, to be 0.5{sup +0.6}{sub -0.3} M{sub ☉} (K km s{sup –1} pc{sup 2}){sup –1}, which agrees with the widely used factor for ultra luminous infrared galaxies of Downes and Solomon (α{sub CO} = 0.8 M{sub ☉} (K km s{sup –1} pc{sup 2}){sup –1})},

  doi          = {10.1088/0004-637X/777/2/126},

  url          = {https://www.osti.gov/biblio/22270582},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 777,

  place        = {United States},

  year         = {Sun Nov 10 00:00:00 EST 2013},

  month        = {Sun Nov 10 00:00:00 EST 2013}

}

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