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Title: ALMA MULTI-LINE IMAGING OF THE NEARBY STARBURST NGC 253

Abstract

We present spatially resolved (∼50 pc) imaging of molecular gas species in the central kiloparsec of the nearby starburst galaxy NGC 253, based on observations taken with the Atacama Large Millimeter/submillimeter Array. A total of 50 molecular lines are detected over a 13 GHz bandwidth imaged in the 3 mm band. Unambiguous identifications are assigned for 27 lines. Based on the measured high CO/C{sup 17}O isotopic line ratio (≳350), we show that {sup 12}CO(1-0) has moderate optical depths. A comparison of the HCN and HCO{sup +} with their {sup 13}C-substituted isotopologues shows that the HCN(1-0) and HCO{sup +}(1-0) lines have optical depths at least comparable to CO(1-0). H{sup 13}CN/H{sup 13}CO{sup +} (and H{sup 13}CN/HN{sup 13}C) line ratios provide tighter constraints on dense gas properties in this starburst. SiO has elevated abundances across the nucleus. HNCO has the most distinctive morphology of all the bright lines, with its global luminosity dominated by the outer parts of the central region. The dramatic variation seen in the HNCO/SiO line ratio suggests that some of the chemical signatures of shocked gas are being erased in the presence of dominating central radiation fields (traced by C{sub 2}H and CN). High density molecular gas tracers (including HCN, HCO{sup +}, andmore » CN) are detected at the base of the molecular outflow. We also detect hydrogen β recombination lines that, like their α counterparts, show compact, centrally peaked morphologies, distinct from the molecular gas tracers. A number of sulfur based species are mapped (CS, SO, NS, C{sub 2}S, H{sub 2}CS, and CH{sub 3}SH) and have morphologies similar to SiO.« less

Authors:
 [1]; ;  [2]; ; ;  [3];  [4];  [5];  [6];  [7];  [8]
  1. New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801 (United States)
  2. Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)
  3. Department of Astronomy and Joint Space-Science Institute, University of Maryland, College Park, MD 20742 (United States)
  4. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  5. National Radio Astronomy Observatory, Pete V. Domenici Array Science Center, P.O. Box O, Socorro, NM 87801 (United States)
  6. Department of Physics, University of Alberta, Edmonton, AB T6G 2E1 (Canada)
  7. Max Planck Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)
  8. European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München (Germany)
Publication Date:
OSTI Identifier:
22522059
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 801; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON 13; CARBON MONOXIDE; CARBON NITRIDES; COMPARATIVE EVALUATIONS; CYANIDES; ELEMENT ABUNDANCE; GALAXIES; GHZ RANGE; HYDROCYANIC ACID; HYDROGEN; HYDROGEN 1; LUMINOSITY; MORPHOLOGY; RECOMBINATION; SILICON OXIDES; STAR CLUSTERS; SULFUR

Citation Formats

Meier, David S., Walter, Fabian, Zschaechner, Laura K., Bolatto, Alberto D., Veilleux, Sylvain, Warren, Steven R., Leroy, Adam K., Ott, Jürgen, Rosolowsky, Erik, Weiß, Axel, and Zwaan, Martin A., E-mail: dmeier@nmt.edu. ALMA MULTI-LINE IMAGING OF THE NEARBY STARBURST NGC 253. United States: N. p., 2015. Web. doi:10.1088/0004-637X/801/1/63.
Meier, David S., Walter, Fabian, Zschaechner, Laura K., Bolatto, Alberto D., Veilleux, Sylvain, Warren, Steven R., Leroy, Adam K., Ott, Jürgen, Rosolowsky, Erik, Weiß, Axel, & Zwaan, Martin A., E-mail: dmeier@nmt.edu. ALMA MULTI-LINE IMAGING OF THE NEARBY STARBURST NGC 253. United States. doi:10.1088/0004-637X/801/1/63.
Meier, David S., Walter, Fabian, Zschaechner, Laura K., Bolatto, Alberto D., Veilleux, Sylvain, Warren, Steven R., Leroy, Adam K., Ott, Jürgen, Rosolowsky, Erik, Weiß, Axel, and Zwaan, Martin A., E-mail: dmeier@nmt.edu. Sun . "ALMA MULTI-LINE IMAGING OF THE NEARBY STARBURST NGC 253". United States. doi:10.1088/0004-637X/801/1/63.
@article{osti_22522059,
title = {ALMA MULTI-LINE IMAGING OF THE NEARBY STARBURST NGC 253},
author = {Meier, David S. and Walter, Fabian and Zschaechner, Laura K. and Bolatto, Alberto D. and Veilleux, Sylvain and Warren, Steven R. and Leroy, Adam K. and Ott, Jürgen and Rosolowsky, Erik and Weiß, Axel and Zwaan, Martin A., E-mail: dmeier@nmt.edu},
abstractNote = {We present spatially resolved (∼50 pc) imaging of molecular gas species in the central kiloparsec of the nearby starburst galaxy NGC 253, based on observations taken with the Atacama Large Millimeter/submillimeter Array. A total of 50 molecular lines are detected over a 13 GHz bandwidth imaged in the 3 mm band. Unambiguous identifications are assigned for 27 lines. Based on the measured high CO/C{sup 17}O isotopic line ratio (≳350), we show that {sup 12}CO(1-0) has moderate optical depths. A comparison of the HCN and HCO{sup +} with their {sup 13}C-substituted isotopologues shows that the HCN(1-0) and HCO{sup +}(1-0) lines have optical depths at least comparable to CO(1-0). H{sup 13}CN/H{sup 13}CO{sup +} (and H{sup 13}CN/HN{sup 13}C) line ratios provide tighter constraints on dense gas properties in this starburst. SiO has elevated abundances across the nucleus. HNCO has the most distinctive morphology of all the bright lines, with its global luminosity dominated by the outer parts of the central region. The dramatic variation seen in the HNCO/SiO line ratio suggests that some of the chemical signatures of shocked gas are being erased in the presence of dominating central radiation fields (traced by C{sub 2}H and CN). High density molecular gas tracers (including HCN, HCO{sup +}, and CN) are detected at the base of the molecular outflow. We also detect hydrogen β recombination lines that, like their α counterparts, show compact, centrally peaked morphologies, distinct from the molecular gas tracers. A number of sulfur based species are mapped (CS, SO, NS, C{sub 2}S, H{sub 2}CS, and CH{sub 3}SH) and have morphologies similar to SiO.},
doi = {10.1088/0004-637X/801/1/63},
journal = {Astrophysical Journal},
number = 1,
volume = 801,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}