2017A&A...598A..55B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:08:26

2017A&A...598A..55B - Astronomy and Astrophysics, volume 598A, 55-55 (2017/2-1)

Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI.

BUSCH G., ECKART A., VALENCIA-S. M., FAZELI N., SCHARWACHTER J., COMBES F. and GARCIA-BURILLO S.

Abstract (from CDS):

NGC 1808 is a nearby barred spiral galaxy which hosts young stellar clusters in a patchy circumnuclear ring with a radius of ∼240pc. In order to study the gaseous and stellar kinematics and the star formation properties of the clusters, we perform seeing-limited H + K-band near-infrared integral-field spectroscopy with SINFONI of the inner ∼600pc. From the MBH* relation, we find a black hole mass of a few 107M. We estimate the age of the young stellar clusters in the circumnuclear ring to be ≥10Myr. No age gradient along the ring is visible. However, the starburst age is comparable to the travel time along the ring, indicating that the clusters almost completed a full orbit along the ring during their lifetime. In the central ∼600pc, we find a hot molecular gas mass of ∼730M which, with standard conversion factors, corresponds to a large cold molecular gas reservoir of several 108M, in agreement with CO measurements from the literature. The gaseous and stellar kinematics show several deviations from pure disc motion, including a circumnuclear disc and signs of a nuclear bar potential. In addition, we confirm streaming motions on the ∼200pc scale that have recently been detected in CO(1-0) emission. Thanks to the enhanced angular resolution of <1'', we find further streaming motion within the inner arcsecond that had not been detected until now. Despite the flow of gas towards the centre, no signs of significant AGN activity are found. This raises the question: will the infalling gas fuel an AGN or star formation?

Abstract Copyright: © ESO, 2017

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

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1433 GiG 03 42 01.553 -47 13 19.49   10.84 9.99 9.61 10.2 ~ 305 0
2 NGC 1566 Sy1 04 20 00.4020009055 -54 56 16.578104141 10.29 10.19 9.73 9.21 10.1 ~ 718 2
3 NGC 1792 EmG 05 05 14.454 -37 58 50.70   10.68 10.18 9.53 10.4 ~ 197 1
4 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 650 3
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11540 0
6 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15   ~ 467 1
7 NGC 7552 GiP 23 16 10.767 -42 35 05.39 11.34 11.22 10.57 10.08 11.1 ~ 507 3

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:08:26

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