2009A&A...505..105V


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET02:02:24

2009A&A...505..105V - Astronomy and Astrophysics, volume 505, 105-116 (2009/10-1)

A kinematic study of the irregular dwarf galaxy NGC 4861 using HI and Hα observations.

VAN EYMEREN J., MARCELIN M., KORIBALSKI B.S., DETTMAR R.-J., BOMANS D.J., GACH J.-L. and BALARD P.

Abstract (from CDS):

Outflows powered by the injection of kinetic energy from massive stars can strongly affect the chemical evolution of galaxies, in particular of dwarf galaxies, as their lower gravitational potentials enhance the chance of a galactic wind. We therefore performed a detailed kinematic analysis of the neutral and ionised gas components in the nearby star-forming irregular dwarf galaxy NGC4861. Similar to a recently published study of NGC2366, we want to make predictions about the fate of the gas and to discuss some general issues about this galaxy. Fabry-Perot interferometric data centred on the Hα line were obtained with the 1.93m telescope at the Observatoire de Haute-Provence. They were complemented by HI synthesis data from the VLA. We performed a Gaussian decomposition of both the Hα and the HI emission lines in order to search for multiple components indicating outflowing gas. The expansion velocities of the detected outflows were compared to the escape velocity of NGC4861, which was modelled with a pseudo-isothermal halo. Both in Hα and HI the galaxy shows several outflows, three directly connected to the disc and probably forming the edges of a supergiant shell, and one at kpc-distance from the disc. We measured velocity offsets of 20 to 30km/s, which are low in comparison to the escape velocity of the galaxy and therefore minimise the chance of a galactic wind.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC4861 - galaxies: irregular - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: structure

Nomenclature: Fig. 1: [VBW2007] NGC 4861 SGSN (No. 5) added.

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 - 2021
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1022 0
2 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1301 1
3 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 711 0
4 Mrk 59 AGN 12 59 00.288 +34 50 42.45           ~ 309 2
5 NGC 4861 H2G 12 59 02.340 +34 51 33.98   12.90 12.32     ~ 358 2
6 [WLM96] NGC 4861 B PoG 12 59 32.6 +34 51 15           ~ 2 0
7 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3840 2

    Equat.    Gal    SGal    Ecl

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2021.03.03-02:02:24

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