2007A&A...463..503M

Query : 2007A&A...463..503M

2007A&A...463..503M - Astronomy and Astrophysics, volume 463503-512 (2007/2-4)

The early-type dwarf galaxy population of the Fornax cluster.

MIESKE S., HILKER M., INFANTE L. and MENDES DE OLIVEIRA C.

Abstract (from CDS):

We analyse the photometric properties of the early-type Fornax cluster dwarf-galaxy population (MV>-17mag), based on a wide-field imaging study of the central cluster area in V and I bandpasses. We used the instrument/telescope combination IMACS/Magellan at Las Campanas Observatory, providing much larger light-collecting area and better image resolution than previous wide-field imaging surveys. We created a fiducial sample of Fornax cluster dwarf ellipticals (dEs) in the following three steps. (1) To verify cluster membership, we measured I-band surface brightness fluctuations (SBF) distances to candidate dEs known from previous surveys. (2) We re-assessed morphological classifications for those candidate dEs that are too faint for SBF detection. (3) We searched for new candidate dEs in the size-luminosity regime close to the resolution limit of previous surveys.(1) We confirm cluster membership for 28 candidate dEs in the range -16.6<MV←10.1mag by means of SBF measurement. We find no SBF background galaxy. (2) Of 51 other candidate dEs in the range -13.2<MV←8.6mag, 2/3 are confirmed as probable cluster members by morphological re-assessment, while 1/3 are re-classified as probable background objects. (3) We find 12 new dE candidates in the range -12.3<MV←8.8mag, two of which are directly confirmed via SBF measurement. The resulting fiducial dE sample follows a well-defined surface brightness-magnitude relation, showing that Fornax dEs are about 40% larger than Local Group dEs. The sample also defines a colour-magnitude relation that appears slightly shallower than that of Local Group dEs. The early-type dwarf galaxy luminosity function in Fornax has a very flat faint end slope α≃-1.1±0.1. We discuss these findings in the context of structure-formation theories.The SBF method is a very powerful tool to help constrain the faint end of the galaxy luminosity function in nearby galaxy clusters. For the Fornax cluster, morphological cluster memberships - if performed at sufficient resolution - are very reliable.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Fornax cluster - galaxies: dwarf - galaxies: fundamental parameters - galaxies: luminosity function, mass function - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/463/503): table1.dat>

Nomenclature: Table 1: [MHI2007] WFLSBNN-NN N=54, [MHI2007] IMN-N-LSBN, [MHI2007] IMN-N-N-LSBN, N=12.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 44

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Number of rows : 44
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 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
2 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
3 LEDA 74731 LSB 03 34 06.0 -35 16 37   19.8       ~ 18 0
4 LEDA 74735 LSB 03 34 12.2 -35 13 43   20.3       ~ 19 0
5 LEDA 74742 LSB 03 34 56.5 -35 11 27   19.0 18.25     ~ 22 0
6 LEDA 74743 GiC 03 34 57.183 -35 12 23.97   19.7 18.97     ~ 13 0
7 LEDA 74745 LSB 03 35 00.2 -35 19 21   19.2 19.26     ~ 24 0
8 LEDA 74747 LSB 03 35 05.5 -35 13 06   19.6 19.07     ~ 22 0
9 LEDA 74754 LSB 03 35 30.366 -35 15 08.26   19.2 18.99     ~ 15 0
10 LEDA 13287 LSB 03 35 42.79 -35 20 17.2   17.2 16.85     ~ 31 1
11 LEDA 74757 LSB 03 35 42.8 -35 30 51   18.3 18.85     ~ 19 0
12 LEDA 74761 LSB 03 36 03.94 -35 23 20.5   17.7 17.34     ~ 27 1
13 LEDA 74770 LSB 03 36 28.0 -35 12 39   18.7 18.78     ~ 22 0
14 LEDA 74775 LSB 03 36 43.0 -35 26 08   18.8       ~ 18 0
15 6dFGS gJ033704.6-353524 GiC 03 37 04.66 -35 35 24.0   15.94   15.65   ~ 51 0
16 LEDA 74787 LSB 03 37 10.0 -35 23 11   19.3       ~ 24 0
17 LEDA 74788 LSB 03 37 10.3 -35 53 18   19.6 19.70     ~ 17 0
18 LEDA 74790 LSB 03 37 17.98 -35 41 54.8   18.2 17.80     ~ 25 1
19 LEDA 74792 LSB 03 37 34.05 -35 49 45.8   17.7       ~ 29 0
20 LEDA 74796 LSB 03 37 41.1 -35 17 46   19.1       ~ 23 0
21 LEDA 648051 GiC 03 38 16.67 -35 30 27.9   17.4 16.84     ~ 20 0
22 LEDA 74806 LSB 03 38 18.80 -35 31 49.4   17.3 17.18     ~ 37 1
23 LEDA 74811 EmG 03 38 21.4890668040 -35 15 34.953195492   15.89 15.65     ~ 42 0
24 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
25 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
26 LEDA 74816 LSB 03 38 36.6 -35 50 02   19.0 18.91     ~ 24 0
27 LEDA 74817 LSB 03 38 37.7 -35 45 27   19.2 19.21     ~ 33 1
28 LEDA 74821 LSB 03 38 45.336 -35 15 59.93   18.5       ~ 21 0
29 LEDA 74826 LSB 03 38 55.048 -35 14 13.20   19.5       ~ 15 0
30 LEDA 13449 GiC 03 39 13.42 -35 22 15.7   15.1 14.91     ~ 68 1
31 LEDA 13452 GiC 03 39 19.60 -35 43 29.0   16.10 15.89     ~ 49 1
32 LEDA 74849 LSB 03 39 50.3 -35 01 19   17.8 18.41     ~ 19 0
33 LEDA 74851 LSB 03 39 51.4 -35 19 20   18.8 18.69     ~ 23 0
34 LEDA 74856 LSB 03 39 55.4 -35 39 44   19.1 18.75     ~ 25 0
35 LEDA 13515 LSB 03 40 23.41 -35 16 32.8   16.20       ~ 40 2
36 LEDA 74923 LSB 03 41 57.5 -35 17 33   18.3       ~ 18 0
37 LEDA 74930 LSB 03 42 11.170 -35 26 35.31   19.2       ~ 15 1
38 LEDA 74933 GiC 03 42 17.2756218024 -35 32 26.556690480   16.26 16.31     ~ 41 0
39 LEDA 74934 LSB 03 42 19.1 -35 33 39   19.3 19.61     ~ 16 0
40 LEDA 74946 LSB 03 42 55.1 -35 20 37   19.0       ~ 15 0
41 LEDA 74951 LSB 03 43 13.5 -35 31 08   18.0 17.89     ~ 17 0
42 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
43 NAME Monoceros Stream St* ~ ~           ~ 374 1
44 NAME Local Group GrG ~ ~           ~ 9325 0

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