2004ApJ...603...67V

Query : 2004ApJ...603...67V

2004ApJ...603...67V - Astrophys. J., 603, 67-73 (2004/March-1)

Faint galaxy population in clusters: X-ray emission, cD halos, and projection effects.

VALOTTO C.A., MURIEL H., MOORE B. and LAMBAS D.G.

Abstract (from CDS):

We analyze samples of nearby clusters taken from the Abell catalog and the X-Ray Sample of Bright Clusters of De Grandi and coworkers, including a wide range of X-ray luminosities. Using the usually-adopted background subtraction procedures, we find that galaxies in clusters selected by means of their X-ray emission show a flat luminosity function (faint-end slope α≃-1.1) consistent with that derived for galaxies in the field and groups. By contrast, the sample of Abell clusters that do not have an X-ray counterpart shows a galaxy luminosity function with a steep faint end (α≃-1.6). We investigate the possibility that cD halos could be formed by the disruption of galaxies in rich relaxed clusters that show an apparently flat faint-end galaxy luminosity function. We find that clusters dominated by a central cD galaxy (Bautz-Morgan classes I and II) show the same systematic trend: X-ray-selected clusters have flatter faint-end slopes than those clusters with no detected X-ray emission. Thus, it is likely the X-ray selection and not the cluster domination by central galaxies is what correlates with background decontamination estimates of the galaxy luminosity function. Moreover, no significant correlation between X-ray luminosity and the galaxy luminosity function faint-end slope is found. These results do not support a scenario in which flat faint-end slopes are a consequence of cD formation via the disruption of faint galaxies. We argue that the clusters without X-ray emission are strongly affected by projection effects which give rise to spurious faint-end slopes estimated using background subtraction procedures.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Elliptical and Lenticular, cD - Galaxies: Luminosity Function, Mass Function - X-Rays: Galaxies: Clusters

Simbad objects: 43

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Number of rows : 43
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 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2731 ClG 00 10 11 -56 59.3           ~ 23 0
3 ACO S 41 ClG 00 25 33 -33 01.0           ~ 25 1
4 ACO 2806 ClG 00 40 10 -56 09.5           ~ 42 1
5 ACO 2824 ClG 00 48 38.0 -21 14 50           ~ 25 0
6 ACO 114 ClG 00 53 39 -21 40.7           ~ 67 0
7 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
8 ACO 2870 ClG 01 07 42.57 -46 54 28.9           ~ 38 1
9 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
10 ACO 2877 ClG 01 09 49.3 -45 54 02           ~ 160 2
11 ACO 2881 ClG 01 11 15 -17 05.1           ~ 14 1
12 ACO 2882 ClG 01 11 57.37 -60 38 05.1           ~ 5 0
13 ACO 2896 ClG 01 18 16 -37 06.2           ~ 15 0
14 ZwCl 0118-1408 ClG 01 20 58.78 -13 51 07.0           ~ 28 0
15 ACO 2933 ClG 01 40 41.2 -54 33 26           ~ 28 0
16 ACO 2992 ClG 02 14 51.02 -26 39 36.9           ~ 9 0
17 ACO 2995 ClG 02 15 10 -24 50.1           ~ 10 0
18 ACO S 301 ClG 02 49 33.72 -31 11 23.2           ~ 70 2
19 ACO 419 ClG 03 08 15.85 -23 41 29.0           ~ 59 0
20 ACO 3093 ClG 03 10 52.0 -47 23 43           ~ 34 0
21 ACO 3125 ClG 03 27 22 -53 30.6           ~ 57 2
22 ACO 3144 ClG 03 37 23.1 -55 06 18           ~ 33 0
23 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
24 ACO 3193 ClG 04 00 40.820 -52 44 02.72           ~ 34 0
25 MCG-06-10-002 rG 04 13 58.7325830136 -38 05 50.064366876   15.19   13.40   ~ 33 0
26 RXC J0413.9-3805 ClG 04 13 58.8 -38 05 53           ~ 24 0
27 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
28 ESO 235-50 G 21 04 51.2902399800 -51 49 23.847217896   14.31   12.61   ~ 28 0
29 ACO 3782 ClG 21 34 31 -62 01.6           ~ 10 0
30 ACO 3816 ClG 21 50 26 -55 19.0           ~ 22 1
31 ACO 3851 ClG 22 16 42 -52 35.0           ~ 12 0
32 ACO 3869 ClG 22 21 26 -55 07.9           ~ 22 0
33 ACO 3880 ClG 22 27 49.5 -30 34 40           ~ 104 2
34 ESO 146-28 G 22 28 51.0804230352 -60 52 55.480031148   14.02 12.90 12.62   ~ 26 0
35 ACO 3893 ClG 22 37 59.71 -23 54 04.2           ~ 6 0
36 ACO 3911 ClG 22 46 22.6 -52 44 21           ~ 73 0
37 ACO 3925 ClG 22 51 49 -46 35.1           ~ 9 0
38 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
39 ACO 4012 ClG 23 31 45 -33 49.4           ~ 10 0
40 ACO 4013 ClG 23 31 51 -35 16.4           ~ 10 0
41 ACO 2660 ClG 23 45 18 -25 58.3           ~ 39 0
42 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
43 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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