Exploring the potential for kinematically colder H I component as a tracer for star-forming gas in nearby galaxies
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Exploring the potential for kinematically colder H I component as a tracer for star-forming gas in nearby galaxies
Original language description
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.
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
—
Continuities
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Others
Publication year
2025
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
540
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
2623-2640
UT code for WoS article
001506465600001
EID of the result in the Scopus database
2-s2.0-105008174008