1997A&A...327..930G


Query : 1997A&A...327..930G

1997A&A...327..930G - Astronomy and Astrophysics, volume 327, 930-946 (1997/11-3)

The formation of cD galaxies.

GARIJO A., ATHANASSOULA E. and GARCIA-GOMEZ C.

Abstract (from CDS):

We present N-body simulations of groups of galaxies with a number of very different initial conditions. These include spherical isotropic, nonspherical anisotropic collapses and virialised spherical systems. In all cases but one the merging instability leads to the formation of a giant central galaxy in the center of the group. The initial conditions of the exception are such that no galaxies are present in the central part of the group. Thus some central seed of material is necessary to trigger the formation of a giant central galaxy. We concentrate on the properties of these giant central galaxies. Spherical virialised systems give rise to relatively round and isotropic systems, while aspherical initial conditions give rise to triaxial objects with anisotropic velocity dispersion tensors. In the latter cases the orientation of the resulting central galaxy is well correlated with that of the initial cluster. We compare the projected properties of the objects formed with the properties of real brightest cluster member galaxies. The surface density profiles are in good agreement with the observed surface brightness profiles. In the case of extended virialised groups the projected properties of the giant central galaxy are the same as the properties of cD galaxies. These include a halo of luminous material and a nearly flat velocity dispersion profile.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: kinematics and dynamics - galaxies: interactions - methods: numerical

Simbad objects: 9

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Number of rows : 9
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 2329 AGN 07 09 08.0049393360 +48 36 55.726108020   13.7 13.99     ~ 122 3
2 ACO 569 ClG 07 09 10.4 +48 37 10           ~ 169 1
3 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 416 0
4 ACO 779 ClG 09 19 48.0 +33 45 32           ~ 247 0
5 ACO 1228 ClG 11 21 30.5 +34 13 21           ~ 126 1
6 ACO 1413 ClG 11 55 18.0 +23 24 19           ~ 399 0
7 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 891 0
8 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 700 1
9 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1128 1

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2022.05.20-19:53:45

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