2013MNRAS.430.1088C

Query : 2013MNRAS.430.1088C

2013MNRAS.430.1088C - Mon. Not. R. Astron. Soc., 430, 1088-1101 (2013/April-1)

Ultracompact dwarfs around NGC3258 in the Antlia cluster.

CASO J.P., BASSINO L.P., RICHTLER T., SMITH CASTELLI A.V. and FAIFER F.R.

Abstract (from CDS):

We present the first compact stellar systems with luminosities in the range of ultracompact dwarfs (UCDs), discovered in the Antlia galaxy cluster (-10.5 < MV < -11.6). The magnitude limit between UCDs and globular clusters (CGs) is discussed. By means of imaging from VLT (FORS1), CTIO (MOSAIC) and the Hubble Space Telescope (ACS) archive, 11 UCDs/bright GCs are selected on the basis of photometry and confirmed as Antlia members through radial velocities measured on new Gemini (GMOS) spectra. In addition, nine UCD candidates are identified taking into account properties derived from their surface brightness profiles. All of them, members and candidates, are located in the proximity of NGC3258, one of the two brightest elliptical galaxies in the cluster core. Antlia UCDs in this sample present absolute magnitudes fainter than MV ∼ -11.6mag and most of them have colours within the blue GC range, falling only two within the red GC range. Effective radii measured for the ones lying on the ACS field are in the range Reff = 3-11pc and are similar to equivalent objects in other clusters, obtained from the literature. The UCD sample shares the same behaviour on the size-luminosity plane: a linear relation between Reff and MV is present for UCDs brighter than MV ∼ -10.5 to -11mag while no trend is detected for fainter ones, that have an approximately constant Reff. The projected spatial distribution of UCDs, GCs and X-ray emission points to an ongoing merger between two Antlia groups, dominated by NGC3258 and NGC3268. Nuclei of dwarf elliptical galaxies and blue UCDs share the same locus on the colour-magnitude diagram, supporting the hypothesis that some blue UCDs may be remnants of stripped nucleated dwarfs.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: clusters: individual: Antlia - galaxies: dwarf - galaxies: individual: NGC 3258 - glaxies: nuclei - galaxies: photometry - galaxies: star clusters: general

Nomenclature: Table 1: [CBR2013] ACO NN (Nos 1-11).

CDS comments: W3 in NGC 7252 = [WSL93] 3 ; UCD 3 = [DJG2000] UCO 3 ; VUCD 7 = [JDJ2006] 7 ; FS90-NNN = [FS90] Antlia NNN.

Simbad objects: 40

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Number of rows : 40
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 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
2 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
3 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
4 CGF 1-4 GlC 03 38 54.0545340024 -35 33 33.320376180   18.5 18.06     ~ 81 1
5 [CBR2013] ACO 1 G 10 28 08.1 -35 33 57           ~ 1 0
6 [FS90] Antlia 87 GiG 10 28 25.20 -35 14 34.8   17.2       ~ 5 0
7 LEDA 83024 GiG 10 28 45.1 -35 34 40   19.8       ~ 8 0
8 [CBR2013] ACO 2 G 10 28 49.2 -35 37 18           ~ 1 0
9 [FS90] Antlia 109 GiG 10 28 53.0 -35 32 52           ~ 6 0
10 NGC 3258 EmG 10 28 53.588 -35 36 19.98   12.50 11.72 10.86   ~ 200 0
11 [CBR2013] ACO 3 G 10 28 56.6 -35 35 39           ~ 1 0
12 [CBR2013] ACO 4 G 10 28 57.6 -35 37 23           ~ 1 0
13 [CBR2013] ACO 5 G 10 28 57.8 -35 34 45           ~ 1 0
14 [CBR2013] ACO 6 G 10 28 58.6 -35 35 37           ~ 1 0
15 [CBR2013] ACO 7 G 10 28 58.8 -35 34 23           ~ 1 0
16 [CBR2013] ACO 8 G 10 28 58.9 -35 34 45           ~ 1 0
17 [CBR2013] ACO 9 G 10 28 59.3 -35 37 03           ~ 1 0
18 [CBR2013] ACO 10 G 10 28 59.8 -35 38 11           ~ 1 0
19 [CBR2013] ACO 11 G 10 29 04.6 -35 37 44           ~ 1 0
20 NGC 3260 GiG 10 29 06.3956235984 -35 35 42.453138552   13.72 14.39 12.11   ~ 58 0
21 LEDA 83053 GiG 10 29 14.8 -35 25 55   18.4       ~ 9 0
22 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 248 0
23 2MASX J10294129-3517244 GiG 10 29 41.298 -35 17 24.40   17.3       ~ 6 0
24 LEDA 83076 GiG 10 29 42.9 -35 29 48   18.5       ~ 7 0
25 NGC 3267 GiG 10 29 48.6040695000 -35 19 20.428071096   13.50 13.35 11.85   ~ 42 0
26 2MASX J10295304-3522307 GiG 10 29 53.0469155808 -35 22 30.782113752   16.0       ~ 17 0
27 2MASX J10295436-3519148 GiG 10 29 54.364 -35 19 14.80   17.0       ~ 11 0
28 LEDA 83087 GiG 10 29 54.4 -35 17 22   18.6       ~ 7 0
29 [FS90] Antlia 186 GiG 10 29 59.52 -35 18 10.8   19.4       ~ 5 0
30 NGC 3268 EmG 10 30 00.6490581240 -35 19 31.519591284   12.57 11.77 10.68   ~ 163 0
31 LEDA 83103 GiG 10 30 06.1 -35 23 27   18.3       ~ 8 0
32 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
33 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
34 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
35 2MASS J12315289+1215589 G 12 31 52.8990925992 +12 15 59.041171656           ~ 52 0
36 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
37 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
38 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
39 [WSL93] 3 GlC 22 20 43.878 -24 40 37.87     17.86     ~ 53 0
40 NGC 7252 AGN 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 720 1

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