2009MNRAS.397.1816P

Query : 2009MNRAS.397.1816P

2009MNRAS.397.1816P - Mon. Not. R. Astron. Soc., 397, 1816-1835 (2009/August-3)

The HST/ACS Coma cluster survey - V. Compact stellar systems in the Coma cluster.

PRICE J., PHILLIPPS S., HUXOR A., TRENTHAM N., FERGUSON H.C., MARZKE R.O., HORNSCHEMEIER A., GOUDFROOIJ P., HAMMER D., TULLY R.B., CHIBOUCAS K., SMITH R.J., CARTER D., MERRITT D., BALCELLS M., ERWIN P. and PUZIA T.H.

Abstract (from CDS):

The Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) Coma Cluster Treasury Survey is a deep two-passband imaging survey of the nearest very rich cluster of galaxies, covering a range of galaxy density environments. The imaging is complemented by a recent wide field redshift survey of the cluster conducted with Hectospec on the 6.5-m Monolithic Mirror Telescope (MMT). Among the many scientific applications for these data is the search for compact galaxies. In this paper, we present the discovery of seven compact (but quite luminous) stellar systems, ranging from M32-like galaxies down to ultra-compact dwarfs (UCDs)/dwarf to globular transition objects (DGTOs).

We find that all seven compact galaxies require a two-component fit to their light profile and have measured velocity dispersions that exceed those expected for typical early-type galaxies at their luminosity. From our structural parameter analysis, we conclude that three of the samples should be classified as compact ellipticals or M32-like galaxies, and the remaining four being less extreme systems. The three compact ellipticals are all found to have old luminosity weighted ages (≳12 Gyr), intermediate metallicities (-0.6 < [Fe/H] < -0.1) and high [Mg/Fe] (≳0.25).

Our findings support a tidal stripping scenario as the formation mode of compact galaxies covering the luminosity range studied here. We speculate that at least two early-type morphologies may serve as the progenitor of compact galaxies in clusters.


Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): surveys - galaxies: clusters: individual: Coma - galaxies: dwarf - galaxies: structure

Nomenclature: Table 1: [PPH2009b] CcGVNNa (Nos 1, 9a-9b, 12, 18, 19a-19b).

Simbad objects: 32

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Number of rows : 32
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 400 1
3 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
4 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
5 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
6 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
7 CGF 1-4 GlC 03 38 54.0545340024 -35 33 33.320376180   18.5 18.06     ~ 81 1
8 LEDA 3084811 GiC 04 33 37.3 -13 15 18           ~ 15 0
9 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
10 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 248 0
11 NGC 4486B GiG 12 30 31.985 +12 29 24.85   14.5       ~ 428 0
12 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
13 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
14 Hanes IV-67 G 12 30 57.3837738072 +12 25 44.498928792   19.32 17.97     ~ 54 0
15 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
16 SDSS J124155.33+114003.7 G 12 41 55.3338419712 +11 40 03.790134948           ~ 56 0
17 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 12.71 12.27 11.386 ~ 814 3
18 GMP 3308 G 12 59 37.11 +27 58 20.4 20.199 19.827 18.842 18.194 17.613 ~ 13 0
19 [CTM2010] 122743 G 12 59 42.27 +28 00 54.5   21.98   20.17 20.19 ~ 4 0
20 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
21 ECO 1227 G 12 59 59.92 +27 59 21.7   21.33 20.47 19.82 19.24 ~ 10 0
22 NGC 4886 EmG 13 00 04.4494334064 +27 59 15.306472032 15.595 15.1 14.294 13.712 13.092 ~ 134 0
23 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 742 1
24 LEDA 126759 AG? 13 00 18.8857734576 +28 00 33.525438120 18.56 18.301 17.36 16.831 16.22 ~ 31 0
25 SDSS J130027.33+280033.4 AG? 13 00 27.27 +28 00 34.2 20.89 20.71 19.61 19.03 18.98 ~ 12 0
26 [PPH2009b] CcGV1 G 13 00 47.67 +28 05 33.9   20.72     18.53 ~ 5 0
27 IC 4045 AGN 13 00 48.6521997192 +28 05 26.675160468 15.25 15.1 13.77 13.573 12.895 ~ 153 0
28 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
29 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
30 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
31 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25           ~ 165 0
32 NGC 5846A GiP 15 06 29.2023813744 +01 35 41.627266512   14.1 13.37 13.07 12.1 ~ 125 0

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