2001A&A...374..800O


Query : 2001A&A...374..800O

2001A&A...374..800O - Astronomy and Astrophysics, volume 374, 800-823 (2001/8-2)

Dynamics of blue compact galaxies, as revealed by their Hα velocity fields. II. Mass models and the starburst triggering mechanism.

OESTLIN G., AMRAM P., BERGVALL N., MASEGOSA J., BOULESTEIX J. and MARQUEZ I.

Abstract (from CDS):

The Hα velocity fields of a sample of six luminous blue compact galaxies (BCGs) and two companions have been obtained by observations with a scanning Fabry-Perot interferometer. The Fabry-Perot images, velocity fields and rotations curves have been presented in a previous paper (Paper I, Oestlin et al., 1999A&AS..137..419O). In general, the velocity fields are irregular and often contain secondary dynamical components, but display overall rotation. The two companions have more regular velocity fields and rotation curves. In this article we analyse the velocity fields and dynamics together with the morphology of the studied BCGs, and present detailed mass models. In addition, we model the stellar mass content by means of multicolour surface photometry and spectral evolutionary synthesis analysis. By comparison of the masses of stars and those derived from the rotation curve, we show that about half of the galaxies cannot be supported by rotation alone. The morphology and dynamics of the BCGs suggest that the starburst activity in these galaxies are most likely triggered by mergers involving gas-rich dwarf galaxies and/or massive gas clouds.

Abstract Copyright:

Journal keyword(s): galaxies: compact - galaxies: starburst - galaxies: kinematics and dynamics - galaxies: evolution - galaxies: formation - galaxies: interactions

Simbad objects: 12

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Number of rows : 12
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 ESO 350-38 AGN 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 304 0
2 ESO 480-12 IG 02 54 45.044 -25 06 37.25   14.85   14.38   ~ 22 0
3 6dFGS gJ034249.5-403555 H2G 03 42 49.4 -40 35 56 15.90 16.41 15.75 16.05 15.55 ~ 30 0
4 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1289 1
5 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1589 0
6 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1138 1
7 ESO 338-4B G 19 27 31.677 -41 38 53.40   15.66 15.0 15.04   ~ 8 1
8 ESO 338-4 IG 19 27 58.338 -41 34 30.81   13.55 13.21 13.14 13.43 ~ 212 1
9 ESO 185-13 AGN 19 45 00.549 -54 15 02.91 14.77 14.94 14.68 14.49 14.19 ~ 47 0
10 ESO 400-43 bCG 20 37 41.931 -35 29 07.94   14.26 14.34 13.93 13.96 ~ 46 2
11 ESO 400-43B G 20 37 51.255 -35 29 43.16   16.25 15.7 15.51   ~ 8 0
12 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 672 1

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2021.08.02-23:05:39

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