| Issue |
A&A
Volume 675, July 2023
|
|
|---|---|---|
| Article Number | A59 | |
| Number of page(s) | 10 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202346521 | |
| Published online | 30 June 2023 | |
The AGN fuelling/feedback cycle in nearby radio galaxies
V. The cold atomic gas of NGC 3100 and its group⋆
1
ASTRON – Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands
e-mail: maccagni@astron.nl
2
INAF – Osservatorio Astronomico di Cagliari, Via della Scienza 5, 09047 Selargius (CA), Italy
3
Cardiff Hub for Astrophysics Research & Technology, School of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff, CF24 3AA
UK
4
INAF – Istituto di Radioastronomia, Via P. Gobetti 101, 40129 Bologna, Italy
5
Armagh Observatory and Planetarium, College Hill, Armagh, BT61 9DG
UK
6
INAF – Osservatorio Astronomico di Capodimonte, Via Moiariello 16, Napoli, 80131
Italy
7
Università di Napoli “Federico II”, Via Cinthia 21, Napoli, 80126
Italy
Received:
28
March
2023
Accepted:
2
May
2023
We present Australia Compact Telescope Array (ATCA) 21 cm observations of the nearby low-excitation radio galaxy (LERG) NGC 3100. This is the brightest galaxy of a loose group and it hosts a young (∼2 Myr) radio source. The ATCA observations reveal for the first time the presence of neutral hydrogen (H I) gas in absorption in the centre of this radio galaxy, and in emission in two low-mass galaxies of the group and in a diffuse dark cloud in the proximity of NGC 3100. The sensitivity to low-column density gas (NHI ∼ 1019 cm−2) allows us to reveal asymmetries in the periphery of most of the H I-detected galaxies, suggesting that tidal interactions may be ongoing. The diffuse cloud does not show a stellar counterpart down to 27 mag arcsec−2 and could be the remnant of these interactions. The analysis of the H I absorption complex in NGC 3100 indicates that the atomic phase of the hydrogen is distributed in the same way as its molecular phase (observed at arcsecond resolution through several carbon monoxide emission lines). We suggest that the interactions occurring within the group are causing turbulent cold gas clouds in the intra-group medium to be slowly accreted towards the centre of NGC 3100. This caused the recent formation of the cold circum-nuclear disc, which is likely sustaining the young nuclear activity.
Key words: galaxies: individual: NGC 3100 / galaxies: active / galaxies: ISM / galaxies: kinematics and dynamics / galaxies: groups: general
The reduced H I datacube is only available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/675/A59
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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