Increased Molecular Gas Velocity Dispersion and Star Formation Efficiency in Barred Galaxy Centres

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646357" target="_blank" >RIV/67985815:90106/25:00646357 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3847/1538-3881/ae0f8f" target="_blank" >https://doi.org/10.3847/1538-3881/ae0f8f</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-3881/ae0f8f" target="_blank" >10.3847/1538-3881/ae0f8f</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Increased Molecular Gas Velocity Dispersion and Star Formation Efficiency in Barred Galaxy Centres

Popis výsledku v původním jazyce

Work by the Physics at High Angular resolution in Nearby GalaxieS (PHANGS) collaboration found higher molecular gas surface densities and velocity dispersions in the centers of barred galaxies compared to unbarred galaxies. We explore central molecular gas using published high resolution (150 pc) measurements of CO(2-1) from the PHANGS-ALMA survey and a new velocity dispersion-dependent prescription for the CO-to-H2 conversion factor alpha CO. Comparisons of the molecular gas surface density, velocity dispersion, star formation rate, and depletion time reveal that these quantities are different in the centers of barred and unbarred galaxies. Gas depletion times are found to be shorter in barred galaxy centers. Even when we control for the presence of an active galactic nucleus, the velocity dispersion and depletion time are found to be statistically different between barred and unbarred galaxy centers. The higher velocity dispersion suggests extra noncircular motions, possibly due to the inflow of gas along the bar, that are not constant but must increase as the star formation rate increases.

Název v anglickém jazyce

Increased Molecular Gas Velocity Dispersion and Star Formation Efficiency in Barred Galaxy Centres

Popis výsledku anglicky

Work by the Physics at High Angular resolution in Nearby GalaxieS (PHANGS) collaboration found higher molecular gas surface densities and velocity dispersions in the centers of barred galaxies compared to unbarred galaxies. We explore central molecular gas using published high resolution (150 pc) measurements of CO(2-1) from the PHANGS-ALMA survey and a new velocity dispersion-dependent prescription for the CO-to-H2 conversion factor alpha CO. Comparisons of the molecular gas surface density, velocity dispersion, star formation rate, and depletion time reveal that these quantities are different in the centers of barred and unbarred galaxies. Gas depletion times are found to be shorter in barred galaxy centers. Even when we control for the presence of an active galactic nucleus, the velocity dispersion and depletion time are found to be statistically different between barred and unbarred galaxy centers. The higher velocity dispersion suggests extra noncircular motions, possibly due to the inflow of gas along the bar, that are not constant but must increase as the star formation rate increases.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Astronomical Journal

ISSN

0004-6256

e-ISSN

1538-3881

Svazek periodika

170

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

314

Kód UT WoS článku

001612136800001

EID výsledku v databázi Scopus

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