TY - JOUR
T1 - WISDOM Project - XXI. Giant molecular clouds in the central region of the barred spiral galaxy NGC 613
T2 - a steep size-linewidth relation
AU - Choi, Woorak
AU - Bureau, Martin
AU - Liu, Lijie
AU - Cappellari, Michele
AU - Davis, Timothy A.
AU - Gensior, Jindra
AU - Liang, Fu Heng
AU - Lu, Anan
AU - Moon, Sanghyuk
AU - Ruffa, Ilaria
AU - Williams, Thomas G.
AU - Chung, Aeree
N1 - Publisher Copyright:
© 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2024/7/1
Y1 - 2024/7/1
N2 - NGC 613 is a nearby barred spiral galaxy with a nuclear ring. Exploiting high spatial resolution (≈20 pc) Atacama Large Millimetre/submillimetre Array 12CO(1-0) observations, we study the giant molecular clouds (GMCs) in the nuclear ring and its vicinity, identifying 158 spatially and spectrally resolved GMCs. The GMC sizes (Rc) are comparable to those of the clouds in the Milky Way (MW) disc, but their gas masses, observed linewidths (σobs,los), and gas mass surface densities are larger. The GMC size-linewidth relation () is steeper than that of the clouds of the MW disc and centre, and the GMCs are on average only marginally gravitationally bound (with a mean virial parameter αobs,vir) ≈ 1.7). We discuss the possible origins of the steep size-linewidth relation and enhanced observed linewidths of the clouds and suggest that a combination of mechanisms such as stellar feedback, gas accretion, and cloud-cloud collisions, as well as the gas inflows driven by the large-scale bar, may play a role.
AB - NGC 613 is a nearby barred spiral galaxy with a nuclear ring. Exploiting high spatial resolution (≈20 pc) Atacama Large Millimetre/submillimetre Array 12CO(1-0) observations, we study the giant molecular clouds (GMCs) in the nuclear ring and its vicinity, identifying 158 spatially and spectrally resolved GMCs. The GMC sizes (Rc) are comparable to those of the clouds in the Milky Way (MW) disc, but their gas masses, observed linewidths (σobs,los), and gas mass surface densities are larger. The GMC size-linewidth relation () is steeper than that of the clouds of the MW disc and centre, and the GMCs are on average only marginally gravitationally bound (with a mean virial parameter αobs,vir) ≈ 1.7). We discuss the possible origins of the steep size-linewidth relation and enhanced observed linewidths of the clouds and suggest that a combination of mechanisms such as stellar feedback, gas accretion, and cloud-cloud collisions, as well as the gas inflows driven by the large-scale bar, may play a role.
KW - ISM: clouds
KW - galaxies: ISM
KW - galaxies: individual: NGC 613
KW - galaxies: nuclei
KW - galaxies: spiral
KW - radio lines: ISM
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U2 - 10.1093/mnras/stae1394
DO - 10.1093/mnras/stae1394
M3 - Article
AN - SCOPUS:85196436879
SN - 0035-8711
VL - 531
SP - 4045
EP - 4059
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -