2021A&A...656A..60A


Query : 2021A&A...656A..60A

2021A&A...656A..60A - Astronomy and Astrophysics, volume 656A, 60-60 (2021/12-1)

Black hole feeding and star formation in NGC 1808.

AUDIBERT A., COMBES F., GARCIA-BURILLO S., HUNT L., ECKART A., AALTO S., CASASOLA V., BOONE F., KRIPS M., VITI S., MULLER S., DASYRA K., VAN DER WERF P. and MARTIN S.

Abstract (from CDS):

We report on Atacama Large Millimeter Array (ALMA) observations of CO(3-2) emission in the Seyfert2/starburst galaxy NGC 1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius 1'' = 45 pc. Within it, we found a decoupled circumnuclear disk or molecular torus of a radius of 0.13'' = 6 pc. The HCN(4-3) and HCO+(4-3) and CS(7-6) dense gas line tracers were simultaneously mapped and detected in the nuclear spiral and they present the same misalignment in the molecular torus. At the nucleus, the HCN/HCO+ and HCN/CS ratios indicate the presence of an active galactic nucleus (AGN). The molecular gas shows regular rotation, within a radius of 400 pc, except for the misaligned disk inside the nuclear spiral arms. The computations of the torques exerted on the gas by the barred stellar potential reveal that the gas within a radius of 100 pc is feeding the nucleus on a timescale of five rotations or on an average timescale of ∼60 Myr. Some non-circular motions are observed towards the center, corresponding to the nuclear spiral arms. We cannot rule out that small extra kinematic perturbations could be interpreted as a weak outflow attributed to AGN feedback. The molecular outflow detected at ≥250 pc in the NE direction is likely due to supernovae feedback and it is connected to the kpc-scale superwind.

Abstract Copyright: © A. Audibert et al. 2021

Journal keyword(s): galaxies: active - galaxies: starburst - galaxies: kinematics and dynamics - galaxies: ISM - galaxies: nuclei - galaxies: individual: NGC 1808

VizieR on-line data: <Available at CDS (J/A+A/656/A60): list.dat fits/*>

CDS comments: Fig.10 Regions RN and IN not in SIMBAD.

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 613 AGN 01 34 18.235 -29 25 06.56   10.77 12.71 9.50 10.6 ~ 390 3
2 NGC 1566 Sy1 04 20 00.3968473248 -54 56 16.624708764 10.29 10.19 9.73 9.21 10.1 ~ 834 2
3 PMN J0453-3949 cm 04 53 16.61918288 -39 49 05.9319092           ~ 12 0
4 NGC 1792 EmG 05 05 14.4036930408 -37 58 50.064531168   10.68 10.18 9.53 10.4 ~ 220 1
5 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 699 3
6 NAME Pic A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 629 1
7 QSO B0521-365 BLL 05 22 57.98464178 -36 27 30.8512953   15.26 14.62 14.48   ~ 792 2
8 NGC 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 450 3
9 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5677 6
10 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1329 2
11 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1166 2
12 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4160 4
13 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2425 2

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2023.01.31-01:27:14

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