New constraints on the (CO)-C-12(2-1)/(1-0) line ratio across nearby disc galaxies
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00553714" target="_blank" >RIV/67985815:_____/21:00553714 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/stab859" target="_blank" >https://doi.org/10.1093/mnras/stab859</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stab859" target="_blank" >10.1093/mnras/stab859</a>
Alternative languages
Result language
angličtina
Original language name
New constraints on the (CO)-C-12(2-1)/(1-0) line ratio across nearby disc galaxies
Original language description
Both the CO(2-1) and CO(1-0) lines are used to trace the mass of molecular gas in galaxies. Translating the molecular gas mass estimates between studies using different lines requires a good understanding of the behaviour of the CO(2-1)-to-CO(1-0) ratio, R-21. We compare new, high-quality CO(1-0) data from the IRAM 30-m EMIR MultiLine Probe of the ISM Regulating Galaxy Evolution survey to the latest available CO(2-1) maps from HERA CO-Line Extragalactic Survey, Physics at High Angular resolution in Nearby Galaxies-ALMA, and a new IRAM 30-m M51 Large Program. This allows us to measure R-21 across the full star-forming disc of nine nearby, massive, star-forming spiral galaxies at 27 arcsec (similar to 1-2 kpc) resolution. We find an average R-21 = 0.64 +/- 0.09 when we take the luminosity-weighted mean of all individual galaxies. This result is consistent with the mean ratio for disc galaxies that we derive from single-pointing measurements in the literature, R-21,R- lit = 0.59(-0.09)(+0.18). The ratio shows weak radial variations compared to the point-to-point scatter in the data. In six out of nine targets, the central enhancement in R-21 with respect to the galaxy-wide mean is of order of similar to 10-20. We estimate an azimuthal scatter of similar to 20 percent in R-21 at fixed galactocentric radius but this measurement is limited by our comparatively coarse resolution of 1.5 kpc. We find mild correlations between R-21 and carbon monoxide (CO) brightness temperature, infrared (IR) intensity, 70-160 mu m ratio, and IR-to-CO ratio. All correlations indicate that R-21 increases with gas surface density, star formation rate surface density, and the interstellar radiation field.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
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Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
504
Issue of the periodical within the volume
3
Country of publishing house
GB - UNITED KINGDOM
Number of pages
25
Pages from-to
3221-3245-25
UT code for WoS article
000656139300009
EID of the result in the Scopus database
2-s2.0-85107853198