Extreme cloud collisions in nearby barred galaxies
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646359" target="_blank" >RIV/67985815:90106/25:00646359 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/staf1080" target="_blank" >https://doi.org/10.1093/mnras/staf1080</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staf1080" target="_blank" >10.1093/mnras/staf1080</a>
Alternative languages
Result language
angličtina
Original language name
Extreme cloud collisions in nearby barred galaxies
Original language description
The inner regions of the Milky Way are known to contain an enigmatic population of prominent molecular clouds characterized by extremely broad lines. The physical origin of these 'extended velocity features' (EVFs) is still debated, although a connection with the 'dust lanes' of the Galactic bar has been hypothesized. In this paper, we search for analogous features in the dust lanes of nearby barred galaxies using the PHANGS-ALMA CO(2-1) survey. We aim to confirm existence of EVFs in other galaxies and to take advantage of the external perspective to gain insight into their origin. We study a sample of 29 barred galaxies and find that 34 per cent contain one or more EVFs, while the remaining lack obvious signs of EVFs. Upon analysing the physical properties of the EVFs, we find they possess large virial parameters, ranging from few hundreds to several thousand, indicating that they are strongly out-of-equilibrium. The most likely explanation for their origin is extreme cloud-cloud collisions with relative velocities in excess of 100 km s-1 in highly non-circular flow driven by the bar. This interpretation is consistent with previous high-resolution observations in Milky Way. Further corroboration of this interpretation comes from the inspection of high-sensitivity infrared observations from the PHANGS-JWST Treasury Survey that reveals streams of gas that appear to be hitting the dust lanes at locations where EVFs are found. We argue that EVFs are the clearest examples of cloud-cloud collisions available in literature and represent a unique opportunity to study cloud collisions and their impact on star formation.
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
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
541
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
23
Pages from-to
3799-3821
UT code for WoS article
001548963400001
EID of the result in the Scopus database
2-s2.0-105013149388