1998A&A...331..439A

Query : 1998A&A...331..439A

1998A&A...331..439A - Astronomy and Astrophysics, volume 331439-450 (1998/3-2)

Segregations in clusters of galaxies.

ADAMI C., BIVIANO A. and MAZURE A.

Abstract (from CDS):

We analyse a sample of about 2000 galaxies in 40 regular clusters, to look for evidence of segregation with respect to galaxy luminosities and morphological types. We find evidence of luminosity segregation for galaxies brighter than MR←21.5, i.e. typically the four brightest members of each cluster. We also find evidence of morphological segregation: both the core-radius and the velocity dispersion increase along the Hubble sequence (ellipticals - S0 - early spirals - late spirals). Galaxies of different types have different velocity dispersion profiles, being steeper for later type galaxies. Simple modelling allows us to show that elliptical (and, to a lesser extent, S0) orbits are mostly tangential in the cluster core, and nearly isotropic outside, while spiral (in particular late-spiral) orbits are predominantly radial. A viable interpretation of our results is that (1) late spirals, at variance with other type galaxies, are a non-virialized cluster population, still on partially radial infalling orbits, (2) the elliptical phase-space distribution is evolving towards energy equipartition through the process of dynamical friction, (3) S0 and early-spirals have intermediate distributions between these two extremes.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: general - cluster: individual: Coma cluster

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
2 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
3 ACO 2877 ClG 01 09 49.3 -45 54 02           ~ 160 2
4 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
5 ACO 194 ClG 01 26 01.3 -01 22 02           ~ 363 2
6 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 727 1
7 ACO 400 ClG 02 57 37.4 +06 00 45           ~ 408 3
8 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
9 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
10 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
11 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
12 ACO 539 ClG 05 16 35.1 +06 27 14           ~ 255 2
13 ACO 548 ClG 05 47 01.7 -25 36 59           B8 209 2
14 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 334 0
15 ACO 3381 ClG 06 09.9 -33 36           ~ 75 2
16 ACO 3389 ClG 06 21 47.4 -64 57 35           ~ 60 3
17 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 312 1
18 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
19 ACO 978 ClG 10 20 26.66 -06 31 37.5           ~ 126 1
20 ACO 999 ClG 10 23 22.1 +12 51 48           ~ 91 1
21 ACO 1016 ClG 10 27.0 +10 59           ~ 82 1
22 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
23 ACO 1142 ClG 11 00 56.74 +10 30 15.2           ~ 157 1
24 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
25 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
26 ACO 1631 ClG 12 52 50.6 -15 25 37           ~ 176 1
27 ACO 1644 ClG 12 57 11.6 -17 24 34           ~ 391 1
28 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
29 NAME IC 4329 Group GrG 13 48 36.4 -30 30 13           ~ 147 2
30 ACO 1983 ClG 14 52 59.33 +16 46 11.0           ~ 249 1
31 ACO 2040 ClG 15 12 44.00 +07 27 34.5           ~ 144 1
32 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 414 2
33 ACO 2147 ClG 16 02 11.96 +15 55 11.5           ~ 416 0
34 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
35 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
36 ACO 3716 ClG 20 51 16.7 -52 41 43           ~ 123 1
37 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 515 2
38 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
39 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0

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