2009MNRAS.392..879G

Query : 2009MNRAS.392..879G

2009MNRAS.392..879G - Mon. Not. R. Astron. Soc., 392, 879-893 (2009/January-2)

Globular cluster systems in nearby dwarf galaxies - I. HST/ACS observations and dynamical properties of globular clusters at low environmental density.

GEORGIEV I.Y., PUZIA T.H., HILKER M. and GOUDFROOIJ P.

Abstract (from CDS):

We investigate the old globular cluster (GC) population of 68 faint (MV> -16mag) dwarf galaxies located in the halo regions of nearby (≲12Mpc) loose galaxy groups and in the field environment based on archival Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) images in F606W and F814W filters. The combined colour distribution of 175 GC candidates peaks at (V - I) = 0.96±0.07mag and the GC luminosity function turnover for the entire sample is found at M_V,TO_= -7.6±0.11mag, similar to the old metal-poor Large Magellanic Cloud (LMC) GC population. Our data reveal a tentative trend of M_V,TO_ becoming fainter from late- to early-type galaxies. The luminosity and colour distributions of GCs in dIrrs show a lack of faint blue GCs (bGCs). Our analysis reveals that this might reflect a relatively younger GC system than typically found in luminous early-type galaxies. If verified by spectroscopy, this would suggest a later formation epoch of the first metal-poor star clusters in dwarf galaxies. We find several bright (massive) GCs which reside in the nuclear regions of their host galaxies. These nuclear clusters have similar luminosities and structural parameters as the peculiar Galactic clusters suspected of being the remnant nuclei of accreted dwarf galaxies, such as M54 and ωCen. Except for these nuclear clusters, the distribution of GCs in dIrrs in the half-light radius versus cluster mass plane is very similar to that of Galactic young halo clusters, which suggests comparable formation and dynamical evolution histories. A comparison with theoretical models of cluster disruption indicates that GCs in low-mass galaxies evolve dynamically as self-gravitating systems in a benign tidal environment.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: dwarf - galaxies: irregular - galaxies: star clusters

VizieR on-line data: <Available at CDS (J/MNRAS/392/879): table3.dat>

Nomenclature: Table 3: [GPH2009] ENNN-NN-NN, [GPH2009] ICNNNN-NN, [GPH2009] NNNNN-NN, [GPH2009] UNNNN-NN, [GPH2009] DNNN-NN-NN, [GPH2009] DDONN-NN, [GPH2009] KKNNN-NN, [GPH2009] KKHNN-NN, [GPH2009] KKSNN-NN, [GPH2009] UANN-NN, [GPH2009] IKN-NN N=175.

Errata: Erratum vol.409 p. 447 (2010)

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

Simbad objects: 74

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Number of rows : 74
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 ESO 349-31 AG? 00 08 13.1536 -34 34 47.836   15.54   14.99   ~ 156 3
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 480 2
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
5 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
6 Z 458-20 AG? 01 07 23.0321 +16 41 00.988 15.01 14.55 14.07     ~ 148 0
7 LEDA 2807103 LSB 01 34 51.5 +52 05 30   17.0       ~ 38 0
8 ESO 154-23 AG? 02 56 50.38 -54 34 17.1   12.63   12.18 12.5 ~ 123 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
10 NGC 1311 Sy2 03 20 06.946 -52 11 07.76 13.89 13.35 12.93 12.75 13.1 ~ 136 0
11 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0
12 IC 1959 GiG 03 33 12.576 -50 24 51.13 13.52 13.32 12.96 12.75 12.7 ~ 119 0
13 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 102 1
14 UGCA 86 AG? 03 59 48.30 +67 08 18.6   14.2 14.2     ~ 110 0
15 UGCA 92 AG? 04 32 03.8366 +63 36 51.243   16.15       ~ 128 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
17 ESO 121-20 AG? 06 15 54.19 -57 43 31.7   15.85   15.49 15.6 ~ 63 1
18 LEDA 95597 LSB 06 47 45.6 +80 07 27   16.4       ~ 74 0
19 ESO 59-1 AG? 07 31 18.20 -68 11 16.8   13.74   12.80 13.7 ~ 81 1
20 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
21 MCG+07-18-004 LSB 08 28 28.560 +41 51 27.13   18       ~ 175 0
22 NAME VKN G 08 40 08.9 +68 26 23           ~ 5 0
23 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 108 0
24 LEDA 2806961 AG? 09 08 53.700 +14 35 02.05           ~ 45 0
25 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
26 ESDO 565-06 G 09 19 30.355 +21 36 12.34           ~ 34 0
27 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
28 NAME IKN G 10 08 05.9 +68 23 57           ~ 82 0
29 LEDA 4689216 GiG 10 21 25.2 +71 06 58           ~ 62 0
30 ESO 215-9 AG? 10 57 29.90 -48 10 43.0   16.03   15.02 15.0 ~ 79 0
31 ESO 320-14 AG? 11 37 53.24 -39 13 13.2   15.85   15.17 16.0 ~ 48 0
32 NGC 4068 AG? 12 04 03.265 +52 35 26.05   13.29   12.77   ~ 189 0
33 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
34 Z 315-26 AG? 12 14 08.40 +66 05 41.0   14.60       ~ 89 1
35 IC 779 GiC 12 19 38.7338921616 +29 52 59.440787328   15.4       ~ 46 0
36 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 149 0
37 NGC 4605 GiG 12 39 59.2837284936 +61 36 32.822365392   10.94   10.35   ~ 347 2
38 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
39 ESO 381-18 EmG 12 44 42.39 -35 58 00.2   15.79   14.84 15.1 ~ 59 0
40 MCG-06-28-017 AG? 12 46 00.67 -33 50 13.0   14.24   13.50 14.0 ~ 91 0
41 LEDA 3994669 AG? 12 47 33.1326 -77 34 59.113           ~ 25 0
42 ESO 443-9 AG? 12 54 53.3144 -28 20 21.770   17.01   16.35   ~ 42 0
43 LEDA 166152 AG? 13 05 02.8154 -40 04 58.706   16.0   16.2 16.0 ~ 64 0
44 MCG+08-24-048 AG? 13 08 03.552 +46 49 40.02   17       ~ 79 0
45 ESO 269-58 AG? 13 10 32.8047 -46 59 37.747   12.50   11.31   ~ 76 0
46 LEDA 166158 G 13 12 45.0 -41 49 55   19.3       ~ 39 0
47 ESO 269-66 GiC 13 13 09.2 -44 53 23   14.14       ~ 64 0
48 LEDA 46663 AG? 13 21 47.40 -45 03 42.0           ~ 62 0
49 LEDA 46680 G 13 22 01.0 -42 32 08   16.6       ~ 63 0
50 LEDA 2815822 G 13 22 12.0 -42 43 51   18.5       ~ 41 0
51 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
52 IC 4247 EmG 13 26 44.43 -30 21 44.7 15.34 14.67 14.28 14.13 14.53 ~ 99 0
53 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
54 ESO 444-78 GiC 13 36 30.7829 -29 14 10.181   15.49   14.81 15.0 ~ 97 0
55 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
56 NGC 5237 EmG 13 37 39.056 -42 50 48.90   13.26 12.67 12.34   ~ 116 1
57 Z 131-18 EmG 13 39 19.348 +24 46 27.77 15.21 14.84 14.46 14.29   ~ 94 0
58 LEDA 2815823 G 13 41 38.1 -42 34 55   18.1       ~ 29 0
59 NAME Cen N G 13 48 09.2 -47 33 54           ~ 24 0
60 LEDA 4614882 AG? 13 48 33.9801 -37 58 03.811           ~ 37 0
61 LEDA 3097113 G 13 51 18.9 -46 58 25           ~ 36 0
62 ESO 384-16 AG? 13 57 01.37 -35 19 58.7   14.80   14.10 14.81 ~ 62 0
63 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 94 0
64 ESO 223-9 AG? 15 01 08.67 -48 17 25.7   12.3   12.5 12.6 ~ 81 0
65 ESO 274-1 G 15 14 13.429 -46 48 33.12   12.00   10.97 11.3 ~ 118 0
66 ESO 137-18 GiG 16 20 58.352 -60 29 27.48   12.23   11.03 11.9 ~ 74 0
67 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
68 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
69 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
70 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
71 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
72 ESO 461-36 G 20 03 57.4 -31 40 53   17.06   16.2 16.1 ~ 73 1
73 NAME NGC 2903 Group GrG ~ ~           ~ 7 0
74 NAME Local Group GrG ~ ~           ~ 9325 0

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