2004A&A...425..813B


Query : 2004A&A...425..813B

2004A&A...425..813B - Astronomy and Astrophysics, volume 425, 813-823 (2004/10-3)

Kinematics of tidal tails in interacting galaxies: Tidal dwarf galaxies and projection effects.

BOURNAUD F., DUC P.-A., AMRAM P., COMBES F. and GACH J.-L.

Abstract (from CDS):

The kinematics of tidal tails in colliding galaxies has been studied via Fabry-Perot observations of the Hα emission. With their large field of view and high spatial resolution, the Fabry-Perot data allow us to probe simultaneously, in 2D, two kinematical features of the tidal ionized gas: large-scale velocity gradients due to streaming motions along the tails, and small-scale motions related to the internal dynamics of giant HII regions within the tails. In several interacting systems, massive (109M) condensations of HI, CO and stars are observed in the outer regions of tails. Whether they are genuine accumulations of matter or not is still debated. Indeed a part of the tidal tail may be aligned with the line-of-sight, and the associated projection effect may result in apparent accumulations of matter that does not exist in the 3D space. Using numerical simulations, we show that studying the large-scale kinematics of tails, it is possible to know whether these accumulations of matter are the result of projection effects or not. We conclude that several ones (Arp 105-South, Arp 242, NGC 7252, and NGC 5291-North) are genuine accumulations of matter. We also study the small-scale motions inside these regions: several small-scale velocity gradients are identified with projected values as large as 50-100km/s accross the observed HII regions. In the case of NGC 5291-North, the spatial resolution of our observations is sufficient to detail the velocity field; we show that this system is rotating and self-gravitating, and discuss its dark matter content. The Fabry-Perot observations have thus enabled us to prove that some 109M condensations of matter are real structures, and are kinematically decoupled from the rest of the tail. Such massive and self-gravitating objects are the progenitors of the so-called ``Tidal Dwarf Galaxies''.

Abstract Copyright:

Journal keyword(s): galaxies: interaction - galaxies: formation - galaxies: evolution - galaxies: kinematics and dynamics

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 2623 LIN 08 38 24.016 +25 45 16.29 14.10 13.99 13.36     ~ 469 1
2 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 832 3
3 NGC 2993 EmG 09 45 48.325 -14 22 06.02 12.72 13.11 12.64 13.4 13.0 ~ 170 1
4 [BLD2000] A105S G 11 11 13.5 +28 41 20           ~ 10 2
5 NAME NGC 3690 West GiP 11 28 30.69 +58 33 33.4   11.8       ~ 622 4
6 UGC 6472 C G 11 28 30.70 +58 33 48.4           ~ 351 0
7 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 935 4
8 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 625 4
9 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1299 1
10 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1623 0
11 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1146 1
12 IC 819 AGN 12 46 10.060 +30 43 54.64           ~ 264 1
13 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 304 0
14 NGC 5291 AGN 13 47 24.5000261808 -30 24 25.449445800   15.18 14.00 13.57 12.7 ~ 146 1
15 IC 1182 AGN 16 05 36.7963581312 +17 48 07.422094440   16.20 15.19     ~ 156 0
16 NGC 7769 LIN 23 51 03.9747703056 +20 09 01.552564620   12.77       ~ 142 1
17 NGC 7771 GiG 23 51 24.880 +20 06 42.57 13.42 13.08 12.25     ~ 326 4

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2022.07.03-10:47:42

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