MeerKAT discovery of an infalling cold gas tail on to the nearby barred spiral galaxy, NGC 5643
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A90106%2F25%3A00646704" target="_blank" >RIV/67985815:90106/25:00646704 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/staf832" target="_blank" >https://doi.org/10.1093/mnras/staf832</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/staf832" target="_blank" >10.1093/mnras/staf832</a>
Alternative languages
Result language
angličtina
Original language name
MeerKAT discovery of an infalling cold gas tail on to the nearby barred spiral galaxy, NGC 5643
Original language description
The detailed study of gas flows in local active galactic nuclei (AGN) is essential for understanding the regulation of star formation and black hole growth, which are fundamental to galaxy evolution. One such AGN case study is NGC 5643, a nearby (D-L similar to 17.3 Mpc) star-forming, late-type, Seyfert galaxy, where inflows and outflows have been observed in detail. NGC 5643 has been studied at multiple wavelengths, however, a key missing component is sensitive, high-resolution neutral hydrogen (H i) observations. We present 21-cm observations of NGC 5643 with MeerKAT, revealing six low-H i mass (M-HI similar to 10(7 )M(circle dot)) sources surrounding NGC 5643 and H i in IC 4444, similar to 230 kpc north of NGC 5643. In NGC 5643, H i extends beyond the stellar disc with several morphological and kinematical asymmetries. North of the disc is an extended 30 kpc tail with counterrotating velocities. This is H i gas accreting on to the regularly rotating disc of NGC 5643 from the environment. Within the spiral arms of the disc, we identify extraplanar gas components, tracing galactic fountains driven by star formation regions. These fountains have a molecular gas component and show an increased H-2/H i ratio. In the circum-nuclear region, we observe spatially unresolved H i absorption that is slightly blue-shifted (similar to 72 km s(-1)) with an H i emission counterpart at red-shifted velocities. These MeerKAT observations provide a complete census of the H i in and around this nearby Seyfert galaxy, providing missing information on the cold gas flows fuelling the star formation and nuclear activity.
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
540
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
2396-2412
UT code for WoS article
001505416700001
EID of the result in the Scopus database
2-s2.0-105008287595