Spatially resolved chemistry in nearby galaxies. III. Dense molecular gas in the inner disk of the LIRG IRAS 04296+2923

Meier, David S.; Turner, Jean L.

doi:10.1088/0004-637X/795/2/107

Title: Spatially resolved chemistry in nearby galaxies. III. Dense molecular gas in the inner disk of the LIRG IRAS 04296+2923

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Abstract

We present a survey of 3 mm molecular lines in IRAS 04296+2923, one of the brightest known molecular-line emitting galaxies, and one of the closest luminous infrared galaxies (LIRGs). Data are from the Owens Valley and CARMA millimeter interferometers. Species detected at ≲ 4'' resolution include C{sup 18}O, HCN, HCO{sup +}, HNC, CN, CH{sub 3}OH, and, tentatively, HNCO. Along with existing CO, {sup 13}CO, and radio continuum data, these lines constrain the chemical properties of the inner disk. Dense molecular gas in the nucleus fuels a star formation rate ≳10 M {sub ☉} yr{sup –1} and is traced by lines of HCN, HCO{sup +}, HNC, and CN. A correlation between HCN and star formation rate is observed on sub-kiloparsec scales, consistent with global relations. Toward the nucleus, CN abundances are similar to those of HCN, indicating emission comes from a collection (∼40-50) of moderate visual extinction, photon-dominated-region clouds. The CO isotopic line ratios are unusual: CO(1-0)/{sup 13}CO(1-0) and CO(1-0)/C{sup 18}O(1-0) line ratios are large toward the starburst, as is commonly observed in LIRGs, but farther out in the disk these ratios are remarkably low (≲ 3). {sup 13}CO/C{sup 18}O abundance ratios are lower than in Galactic clouds, possibly because themore »« less

Authors:

Meier, David S. ^[1]; Turner, Jean L. ^[2]

Department of Physics, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 (United States)
Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547 (United States)

Publication Date:: Mon Nov 10 00:00:00 EST 2014

OSTI Identifier:: 22370035

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 795; 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; ABUNDANCE; CARBON MONOXIDE; CARBON NITRIDES; CORRELATIONS; CYANIDES; EMISSION; GALAXIES; GALAXY NUCLEI; HYDROCYANIC ACID; METHANOL; PHOTONS; RESOLUTION; STARS

Citation Formats


                    Meier, David S., Turner, Jean L., and Beck, Sara C., E-mail: dmeier@nmt.edu, E-mail: turner@astro.ucla.edu, E-mail: sara@wise.tau.ac.il. Spatially resolved chemistry in nearby galaxies. III. Dense molecular gas in the inner disk of the LIRG IRAS 04296+2923.  United States: N. p., 2014. 
        Web.  doi:10.1088/0004-637X/795/2/107.

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                    Meier, David S., Turner, Jean L., & Beck, Sara C., E-mail: dmeier@nmt.edu, E-mail: turner@astro.ucla.edu, E-mail: sara@wise.tau.ac.il. Spatially resolved chemistry in nearby galaxies. III. Dense molecular gas in the inner disk of the LIRG IRAS 04296+2923.  United States.  https://doi.org/10.1088/0004-637X/795/2/107

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                    Meier, David S., Turner, Jean L., and Beck, Sara C., E-mail: dmeier@nmt.edu, E-mail: turner@astro.ucla.edu, E-mail: sara@wise.tau.ac.il. 2014.  
        "Spatially resolved chemistry in nearby galaxies. III. Dense molecular gas in the inner disk of the LIRG IRAS 04296+2923".  United States.  https://doi.org/10.1088/0004-637X/795/2/107.

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@article{osti_22370035,

  title        = {Spatially resolved chemistry in nearby galaxies. III. Dense molecular gas in the inner disk of the LIRG IRAS 04296+2923},

  author       = {Meier, David S. and Turner, Jean L. and Beck, Sara C., E-mail: dmeier@nmt.edu, E-mail: turner@astro.ucla.edu, E-mail: sara@wise.tau.ac.il},

  abstractNote = {We present a survey of 3 mm molecular lines in IRAS 04296+2923, one of the brightest known molecular-line emitting galaxies, and one of the closest luminous infrared galaxies (LIRGs). Data are from the Owens Valley and CARMA millimeter interferometers. Species detected at ≲ 4'' resolution include C{sup 18}O, HCN, HCO{sup +}, HNC, CN, CH{sub 3}OH, and, tentatively, HNCO. Along with existing CO, {sup 13}CO, and radio continuum data, these lines constrain the chemical properties of the inner disk. Dense molecular gas in the nucleus fuels a star formation rate ≳10 M {sub ☉} yr{sup –1} and is traced by lines of HCN, HCO{sup +}, HNC, and CN. A correlation between HCN and star formation rate is observed on sub-kiloparsec scales, consistent with global relations. Toward the nucleus, CN abundances are similar to those of HCN, indicating emission comes from a collection (∼40-50) of moderate visual extinction, photon-dominated-region clouds. The CO isotopic line ratios are unusual: CO(1-0)/{sup 13}CO(1-0) and CO(1-0)/C{sup 18}O(1-0) line ratios are large toward the starburst, as is commonly observed in LIRGs, but farther out in the disk these ratios are remarkably low (≲ 3). {sup 13}CO/C{sup 18}O abundance ratios are lower than in Galactic clouds, possibly because the C{sup 18}O is enriched by massive star ejecta from the starburst. {sup 13}CO is underabundant relative to CO. Extended emission from CH{sub 3}OH indicates that dynamical shocks pervade both the nucleus and the inner disk. The unusual CO isotopologue ratios, the CO/HCN intensity ratio versus L {sub IR}, the HCN/CN abundance ratio, and the gas consumption time versus inflow rate all indicate that the starburst in IRAS 04296+2923 is in an early stage of development.},

  doi          = {10.1088/0004-637X/795/2/107},

  url          = {https://www.osti.gov/biblio/22370035},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 795,

  place        = {United States},

  year         = {Mon Nov 10 00:00:00 EST 2014},

  month        = {Mon Nov 10 00:00:00 EST 2014}

}

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