2009A&A...498..705M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:27:14

2009A&A...498..705M - Astronomy and Astrophysics, volume 498, 705-710 (2009/5-2)

A search for massive ultra-compact dwarf galaxies in the Centaurus galaxy cluster.

MIESKE S., HILKER M., MISGELD I., JORDAN A., INFANTE L. and KISSLER-PATIG M.

Abstract (from CDS):

In a previous paper, we initiated a search for ultra-compact dwarf galaxies (UCDs) in the Centaurus galaxy cluster, resulting in the discovery of 27 compact objects with -12.2<MV←10.9mag. Our overall survey completeness was 15-20% within 120kpc projected clustercentric distance. To constrain the luminosity distribution of the brightest UCDs in Centaurus in a more accurate way, we continue our search by improving substantially our survey completeness specifically for brightnesses of MV←12mag (V0<21.3mag). Using VIMOS at the VLT, we obtained low resolution spectra of 400 compact objects with 19.3<V0<21.3mag (-14<MV←12mag at the Centaurus distance) in the central 25' of the Centaurus cluster, which corresponds to a projected radius of ∼150kpc. Our survey had complete area coverage within a radius of ∼120kpc. For 94% of the sources included in the masks, we measure successfully a redshift. Because of incompleteness in the slit assignment, our final completeness in the area surveyed is 52%. Among our targets, we find three new UCDs in the magnitude range -12.2<MV←12mag, hence at the faint limit of our survey. For one of these targets HST WFPC2 imaging is available, yielding a size estimate of rh≲8-9pc. At 95% confidence, we can reject the hypothesis that in the area surveyed there are more than 2 massive UCDs with MV←12.2mag and reff≲70pc. Hence our survey confirms the extreme rarity of massive UCDs. We find that the radial distributions of Centaurus and Fornax UCDs with respect to their host clusters' centres agree within the 2σ level.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Centaurus - galaxies: dwarf - galaxies: fundamental parameters - galaxies: nuclei - galaxies: star clusters

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1573 0
2 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 780 1
3 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5925 0
4 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1975 2
5 CCOS J1247.49-4115.28 GiC 12 47 49.930 -41 15 28.04           ~ 2 0
6 CCOS J1248.30-4124.04 GiC 12 48 30.880 -41 24 04.96           ~ 2 0
7 CCOS J1248.48-4120.01 GiC 12 48 48.010 -41 20 01.52           ~ 2 0
8 NGC 4696 BiC 12 48 49.277 -41 18 39.92   11.21   10.7   ~ 456 3
9 NAME Cen 30 ClG 12 48 51.7 -41 18 21           ~ 57 0
10 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 984 2

    Equat.    Gal    SGal    Ecl

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2020.11.25-10:27:14

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