2006A&A...445...29P


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.18CEST03:57:28

2006A&A...445...29P - Astronomy and Astrophysics, volume 445, 29-42 (2006/1-1)

RASS-SDSS Galaxy cluster survey. IV. A ubiquitous dwarf galaxy population in clusters.

POPESSO P., BIVIANO A., BOEHRINGER H. and ROMANIELLO M.

Abstract (from CDS):

We analyze the Luminosity Functions (LFs) of a subsample of 69 clusters from the RASS-SDSS galaxy cluster catalog. When calculated within the cluster physical sizes, given by r200 or r500, all the cluster LFs appear to have the same shape, well fitted by a composite of two Schechter functions with a marked upturn and a steepening at the faint-end. Previously reported cluster-to-cluster variations of the LF faint-end slope are due to the use of a metric cluster aperture for computing the LF of clusters of different masses. We determine the composite LF for early- and late-type galaxies, where the typing is based on the galaxy u-r colors. The late-type LF is well fitted by a single Schechter function with a steep slope (α=-2.0 in the r band, within r200). The early-type LF instead cannot be fitted by a single Schechter function, and a composite of two Schechter functions is needed. The faint-end upturn of the global cluster LF is due to the early-type cluster galaxies. The shape of the bright-end tail of the early-type LF does not seem to depend upon the local galaxy density or the distance from the cluster center. The late-type LF shows a significant variation only very near the cluster center. On the other hand, the faint-end tail of the early-type LF shows a significant and continuous variation with the environment. We provide evidence that the process responsible for creating the excess population of dwarf early type galaxies in clusters is a threshold process that occurs when the density exceeds ∼500 times the critical density of the Universe. We interpret our results in the context of the ``harassment'' scenario, where faint early-type cluster galaxies are predicted to be the descendants of tidally-stripped late-type galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: luminosity function, mass function

Nomenclature: Figs 5, 7: [PBR2005] AANNN N=5 added.

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 765 0
2 BAX 024.3000-09.1833 ClG 01 37 16.19 -09 11 40.0           ~ 27 0
3 ClG J0810+4216 ClG 08 10 24.2 +42 16 19           ~ 24 0
4 NAME NGC 4073 Group GrG 12 04 21.7 +01 50 19     13.53     ~ 238 0
5 ACO 1767 ClG 13 36 08.33 +59 12 23.0           ~ 151 0
6 RXC J1424.8+0240 ClG 14 24 48.5 +02 40 56           ~ 4 0
7 NAME NGC 5718 Group ClG 14 40 38.5 +03 28 20     14.31     ~ 100 0
8 NAME NGC 6338 Group GrG 17 15 21.4 +57 22 43           ~ 67 0
9 ACO 2399 ClG 21 57 27.64 -07 48 12.9           ~ 156 0
10 ACO 2593 ClG 23 24 31.0 +14 38 29           ~ 193 0
11 [PBR2005] RO188 ClG ~ ~           ~ 1 0
12 [PBR2005] RX193 ClG ~ ~           ~ 1 0
13 [PBR2005] RX288 ClG ~ ~           ~ 1 0
14 [PBR2005] RX450 ClG ~ ~           ~ 1 0
15 [PBR2005] RO313 ClG ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.09.18-03:57:28

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