New constraints on the (CO)-C-12(2-1)/(1-0) line ratio across nearby disc galaxies

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

New constraints on the (CO)-C-12(2-1)/(1-0) line ratio across nearby disc galaxies

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

New constraints on the (CO)-C-12(2-1)/(1-0) line ratio across nearby disc galaxies

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

504

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

25

Strana od-do

3221-3245-25

Kód UT WoS článku

000656139300009

EID výsledku v databázi Scopus

2-s2.0-85107853198