Exploring the potential for kinematically colder H I component as a tracer for star-forming gas in nearby galaxies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646368" target="_blank" >RIV/67985815:90106/25:00646368 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/staf902" target="_blank" >https://doi.org/10.1093/mnras/staf902</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/staf902" target="_blank" >10.1093/mnras/staf902</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Exploring the potential for kinematically colder H I component as a tracer for star-forming gas in nearby galaxies

Popis výsledku v původním jazyce

Atomic hydrogen (H I) dominates the mass of the cold interstellar medium, undergoing thermal condensation to form molecular gas and fuel star formation. Kinematically colder H I components, identified via kinematic decomposition of H I 21 cm data cubes, serve as a crucial transition phase between diffuse warm neutral gas and molecular hydrogen (H-2). We analyse these colder H I components by decomposing H I 21 cm data cubes of seven nearby galaxies Sextans A, NGC 6822, WLM, NGC 5068, NGC 7793, NGC 1566, and NGC 5236 spanning metallicities (0.1 < Z/Z(circle dot)< 1.0) and physical scales (53-1134 pc). Using a velocity dispersion threshold of 6 km s(-1), we classify the kinematically distinct components into narrow (colder) and broad (warmer). Cross-correlation analysis between the narrow H I components and HI 21 or star formation rate (SFR) surface density at different spatial scales reveals that dwarf galaxies exhibit the strongest correlation at similar to 500-700 pc. The radially binned narrow H I fraction, fn = I-narrow (H l) / I-totalH I, in dwarf galaxies shows no clear trend with metallicity or SFR, while in spirals, f(n) is lower in inner regions with higher metallicity and SFR. We find that the data set resolution significantly impacts the results, with higher physical resolution data yielding a higher median f(n), < f(n)>, per galaxy. With this considered, dwarf galaxies consistently exhibit a larger f(n) than spiral galaxies. These findings highlight the critical role of cold H I in regulating star formation across different galactic environments and emphasize the need for high resolution H I observations to further unravel the connection between atomic-to-molecular gas conversion and galaxy evolution.

Název v anglickém jazyce

Exploring the potential for kinematically colder H I component as a tracer for star-forming gas in nearby galaxies

Popis výsledku anglicky

Atomic hydrogen (H I) dominates the mass of the cold interstellar medium, undergoing thermal condensation to form molecular gas and fuel star formation. Kinematically colder H I components, identified via kinematic decomposition of H I 21 cm data cubes, serve as a crucial transition phase between diffuse warm neutral gas and molecular hydrogen (H-2). We analyse these colder H I components by decomposing H I 21 cm data cubes of seven nearby galaxies Sextans A, NGC 6822, WLM, NGC 5068, NGC 7793, NGC 1566, and NGC 5236 spanning metallicities (0.1 < Z/Z(circle dot)< 1.0) and physical scales (53-1134 pc). Using a velocity dispersion threshold of 6 km s(-1), we classify the kinematically distinct components into narrow (colder) and broad (warmer). Cross-correlation analysis between the narrow H I components and HI 21 or star formation rate (SFR) surface density at different spatial scales reveals that dwarf galaxies exhibit the strongest correlation at similar to 500-700 pc. The radially binned narrow H I fraction, fn = I-narrow (H l) / I-totalH I, in dwarf galaxies shows no clear trend with metallicity or SFR, while in spirals, f(n) is lower in inner regions with higher metallicity and SFR. We find that the data set resolution significantly impacts the results, with higher physical resolution data yielding a higher median f(n), < f(n)>, per galaxy. With this considered, dwarf galaxies consistently exhibit a larger f(n) than spiral galaxies. These findings highlight the critical role of cold H I in regulating star formation across different galactic environments and emphasize the need for high resolution H I observations to further unravel the connection between atomic-to-molecular gas conversion and galaxy evolution.

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

2025

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

540

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

2623-2640

Kód UT WoS článku

001506465600001

EID výsledku v databázi Scopus

2-s2.0-105008174008