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Title: | [C I](1-0) and [C I](2-1) in Resolved Local Galaxies | Authors: | Crocker, Alison F. Pellegrini, Eric Smith, J. -D. T. Draine, Bruce T. Wilson, Christine D. Wolfire, Mark Armus, Lee Brinks, Elias Dale, Daniel A. Groves, Brent Herrera-Camus, Rodrigo HUNT, Leslie Kipp Kennicutt, Robert C. Murphy, Eric J. Sandstrom, Karin Schinnerer, Eva RIGOPOULOU, DIMITRA Rosolowsky, Erik van der Werf, Paul |
Issue Date: | 2019 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 887 | Issue: | 1 | First Page: | 105 | Abstract: | We present resolved [C I] line intensities of 18 nearby galaxies observed with the SPIRE FTS spectrometer on the Herschel Space Observatory. We use these data along with resolved CO line intensities from J <SUB>up</SUB> = 1 to 7 to interpret what phase of the interstellar medium the [C I] lines trace within typical local galaxies. A tight, linear relation is found between the intensities of the CO(4-3) and [C I](2-1) lines; we hypothesize this is due to the similar upper level temperature of these two lines. We modeled the [C I] and CO line emission using large-velocity gradient models combined with an empirical template. According to this modeling, the [C I](1-0) line is clearly dominated by the low-excitation component. We determine [C I] to molecular mass conversion factors for both the [C I](1-0) and [C I](2-1) lines, with mean values of α <SUB>[C I](1-0)</SUB> = 7.3 M <SUB>☉</SUB> K<SUP>-1</SUP> km<SUP>-1</SUP> s pc<SUP>-2</SUP> and α <SUB>[C I](2-1)</SUB> = 34 M <SUB>☉</SUB> K<SUP>-1</SUP> km<SUP>-1</SUP> s pc<SUP>-2</SUP> with logarithmic root-mean-square spreads of 0.20 and 0.32 dex, respectively. The similar spread of {α }<SUB>[{{C</SUB>}{{I}}](1{--}0)} to {α }<SUB>CO</SUB>} (derived using the CO(2-1) line) suggests that [C I](1-0) may be just as good a tracer of cold molecular gas as CO(2-1) in galaxies of this type. On the other hand, the wider spread of α <SUB>[C I](2-1)</SUB> and the tight relation found between [C I](2-1) and CO(4-3) suggest that much of the [C I](2-1) emission may originate in warmer molecular gas. <P />Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. | URI: | http://hdl.handle.net/20.500.12386/29620 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab4196 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab4196 | Bibcode ADS: | 2019ApJ...887..105C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Crocker_2019_ApJ_887_105.pdf | pdf editoriale | 2.31 MB | Adobe PDF | View/Open |
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