2008A&A...486..697M


Query : 2008A&A...486..697M

2008A&A...486..697M - Astronomy and Astrophysics, volume 486, 697-709 (2008/8-2)

The early-type dwarf galaxy population of the Hydra I cluster.

MISGELD I., MIESKE S. and HILKER M.

Abstract (from CDS):

We analyse the properties of the early-type dwarf galaxy population (MV>-17mag) in the Hydra I cluster. We investigate the galaxy luminosity function (LF), the colour-magnitude relation (CMR), and the magnitude-surface brightness relation down to MV~-10mag. Another goal of this study is to find candidates for ultra-compact dwarf galaxies (UCDs) in Hydra I. Two spectroscopic surveys performed with Magellan I/LDSS2 at Las Campanas Observatory and VLT/VIMOS, as well as deep VLT/FORS1 images in V and I bands, covering the central parts of the cluster, were examined. We identify cluster members by radial velocity measurements and select other cluster galaxy candidates by their morphology and low surface brightness. The candidates' total magnitudes and central surface brightnesses were derived from the analysis of their surface brightness profiles. To determine the faint-end slope of the LF, the galaxy number counts are completeness corrected. We obtain radial velocities for 126 objects and identify 32 cluster members, of which 5 are previously uncatalogued dwarf galaxies. One possible UCD candidate with MV=-13.26mag is found. Our sample of ≃100 morphologically selected dwarf galaxies with MV>-17mag defines a CMR that extends the CMR of the giant cluster galaxies to the magnitude limit of our survey (MV~-10mag). It matches the relations found for the Local Group (LG) and the Fornax cluster dwarf galaxies almost perfectly. The Hydra I dwarf galaxies also follow a magnitude-surface brightness relation that is very similar to that of the LG dwarf galaxies. Moreover, we observe a continuous relation for dwarf galaxies and giant early-type galaxies when plotting the central surface brightness µ0 of a Sersic model vs. the galaxy magnitude. The effective radius is found to be largely independent of the luminosity for MV>-18mag. It is consistent with a constant value of Re∼0.8 kpc. We present the photometric parameters of the galaxies as the Hydra I Cluster Catalogue (HCC). By fitting a Schechter function to the luminosity distribution, we derive a very flat faint-end slope of the LF (α=-1.13±0.04), whereas fitting a power law for MV>-14mag gives α=-1.40±0.18. Our findings of a continuous CMR and µ0-MV relation for dwarf and giant early-type galaxies suggests that they are the same class of objects. The similarity of those relations to other environments like the LG implies that internal processes could be more important for their global photometric properties than external influences.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Hydra I - galaxies: dwarf - galaxies: fundamental parameters - galaxies: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/A+A/486/697): tablea2.dat>

Nomenclature: Table 2: [MMH2008] Na-NN (No. 7a-31),[MMH2008] aN-NN (Nos q2-15, q3-18). Table A2: HCC NNN (Nos 1-111).

Simbad objects: 129

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Number of rows : 129
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 1461 PM* 00 18 41.8676757921 -08 03 10.803829898   7.14 6.46     G3VFe0.5 342 1
2 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2088 2
3 NGC 1396 GiG 03 38 06.5677454520 -35 26 23.637846372   14.80       ~ 86 1
4 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1687 0
5 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 551 1
6 NGC 1426 GiG 03 42 49.0997091480 -22 06 30.173615028   12.21 11.44 10.90   ~ 188 0
7 NGC 1700 GiG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 337 1
8 ACO S 636 ClG 10 29 41.0957 -35 19 32.908           ~ 211 0
9 [MMH2008] q3-18 G 10 35 45.710 -27 33 38.41     22.611 21.92   ~ 3 0
10 HCC 77 G 10 36 21.3 -27 31 22     21.52   20.69 ~ 3 0
11 HCC 94 G 10 36 22.2 -27 33 08     22.01   21.26 ~ 3 0
12 NGC 3308 GiG 10 36 22.3394738568 -27 26 17.314025100   13.29 12.36 11.73 11.11 ~ 78 0
13 HCC 75 G 10 36 22.9 -27 35 41     21.50   20.43 ~ 3 0
14 6dFGS gJ103623.1-272115 GiC 10 36 23.0735882712 -27 21 14.934339072   15.9 14.40   13.13 ~ 36 0
15 HCC 69 G 10 36 23.8 -27 13 19     21.23   20.23 ~ 3 0
16 HCC 74 G 10 36 24.0 -27 27 47     21.46   20.54 ~ 3 0
17 HCC 109 G 10 36 24.4 -27 35 31     23.01   22.28 ~ 3 0
18 HCC 102 G 10 36 24.5 -27 14 07     22.52   21.83 ~ 3 0
19 HCC 99 G 10 36 24.6 -27 22 09     22.16   21.08 ~ 3 0
20 HCC 80 G 10 36 24.6 -27 11 44     21.54   20.62 ~ 3 0
21 2MASX J10362490-2734542 GiC 10 36 24.8747350584 -27 34 54.333253524   15.8 14.61   13.43 ~ 28 0
22 HCC 100 G 10 36 25.0 -27 21 58     22.24   21.21 ~ 3 0
23 HCC 68 G 10 36 25.9 -27 17 24     21.20   20.33 ~ 3 0
24 HCC 32 G 10 36 26.0 -27 35 52     18.47   17.54 ~ 3 0
25 HCC 81 G 10 36 26.5 -27 32 42     21.57   20.79 ~ 3 0
26 HCC 76 G 10 36 26.5 -27 32 16     21.52   20.88 ~ 3 0
27 HCC 79 G 10 36 26.6 -27 27 13     21.53   20.70 ~ 3 0
28 LEDA 755661 GiC 10 36 26.7 -27 23 25     17.19   16.15 ~ 12 0
29 HCC 83 G 10 36 27.4 -27 31 28     21.66   20.69 ~ 3 0
30 HCC 110 G 10 36 27.5 -27 32 12     23.06   22.23 ~ 3 0
31 2MASX J10362764-2719092 GiG 10 36 27.6597454536 -27 19 09.163367256   15.6 13.78   12.53 ~ 40 0
32 HCC 84 G 10 36 28.0 -27 30 55     21.68   20.74 ~ 3 0
33 HCC 92 G 10 36 28.0 -27 29 37     21.96   21.28 ~ 3 0
34 HCC 38 GiC 10 36 28.80 -27 14 36.6     19.32   18.65 ~ 5 0
35 6dFGS gJ103629.1-272903 GiC 10 36 29.0670371376 -27 29 02.653633716   15.8 14.32   13.14 ~ 36 0
36 HCC 61 G 10 36 29.3 -27 27 24     20.75   19.81 ~ 3 0
37 HCC 64 G 10 36 29.8 -27 33 27     20.97   20.11 ~ 3 0
38 HCC 62 G 10 36 31.0 -27 17 59     20.75   19.78 ~ 3 0
39 HCC 73 G 10 36 31.0 -27 15 15     21.45   20.44 ~ 3 0
40 HCC 35 G 10 36 32.5 -27 32 23     19.15   18.08 ~ 3 0
41 HCC 95 G 10 36 32.8 -27 15 15     22.01   21.29 ~ 3 0
42 [MMH2008] q2-15 ? 10 36 32.820 -27 32 49.20     20.07 19.50   ~ 1 0
43 HCC 82 G 10 36 33.5 -27 27 00     21.59   20.82 ~ 3 0
44 HCC 47 G 10 36 33.8 -27 27 41     19.94   18.98 ~ 3 0
45 6dFGS gJ103635.0-272845 GiC 10 36 34.9891718280 -27 28 44.648132844   16.1 14.85   13.69 ~ 21 0
46 HCC 96 G 10 36 35.4 -27 15 21     22.13   21.22 ~ 3 0
47 2MASX J10363551-2728122 GiC 10 36 35.4997615200 -27 28 12.467009712   16.75 15.23 15.62 14.10 ~ 23 0
48 HCC 108 G 10 36 35.5 -27 13 36     22.78   21.96 ~ 3 0
49 NGC 3309 GiG 10 36 35.6607096792 -27 31 05.732321664   11.98 11.78 10.34 10.51 ~ 153 0
50 HCC 67 G 10 36 35.8 -27 15 51     21.15   20.47 ~ 3 0
51 HCC 42 G 10 36 35.9 -27 19 36     19.84   19.13 ~ 3 0
52 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 805 1
53 HCC 90 G 10 36 36.4 -27 35 41     21.88   21.02 ~ 3 0
54 HCC 88 G 10 36 36.6 -27 12 41     21.76   20.92 ~ 3 0
55 HCC 55 G 10 36 37.2 -27 22 55     20.40   19.46 ~ 3 0
56 HCC 86 G 10 36 37.9 -27 11 41     21.71   20.84 ~ 3 0
57 HCC 103 G 10 36 38.0 -27 35 40     22.55   21.57 ~ 3 0
58 HCC 39 G 10 36 38.8 -27 25 08     19.37   18.34 ~ 3 0
59 HCC 87 G 10 36 39.0 -27 21 25     21.75   20.68 ~ 14 0
60 HCC 106 G 10 36 39.7 -27 32 41     22.64   21.68 ~ 3 0
61 LEDA 141483 GiC 10 36 40.4 -27 32 56     17.67   16.68 ~ 9 0
62 HCC 43 G 10 36 40.6 -27 25 19     19.84   18.75 ~ 3 0
63 HCC 78 G 10 36 40.8 -27 19 39     21.53   20.48 ~ 3 0
64 2MASX J10364122-2733392 GiG 10 36 41.1952357848 -27 33 39.785933952   15.7 14.18   12.99 ~ 41 0
65 HCC 36 G 10 36 41.3 -27 23 37     19.23   18.44 ~ 3 0
66 HCC 58 G 10 36 41.5 -27 16 37     20.72   19.59 ~ 3 0
67 LEDA 141484 GiC 10 36 42.7 -27 35 09     16.51   15.43 ~ 12 0
68 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 285 2
69 HCC 28 GiC 10 36 42.99 -27 25 29.5     18.10   16.98 ~ 6 0
70 HCC 37 G 10 36 43.1 -27 35 43     19.25   18.33 ~ 3 0
71 HCC 65 G 10 36 43.7 -27 32 58     21.05   20.11 ~ 3 0
72 HCC 41 G 10 36 43.7 -27 17 30     19.81   18.84 ~ 3 0
73 HCC 45 GiC 10 36 44.4 -27 31 23     19.91   18.68 ~ 4 0
74 HCC 54 G 10 36 44.9 -27 23 01     20.37   19.42 ~ 3 0
75 2MASX J10364490-2728102 GiG 10 36 44.9346011784 -27 28 10.238307060   16.2 14.06   12.89 ~ 37 0
76 HCC 44 G 10 36 45.1 -27 14 29     19.88   18.78 ~ 3 0
77 HCC 71 G 10 36 45.6 -27 34 57     21.36   20.53 ~ 3 0
78 HCC 27 GiC 10 36 45.70 -27 30 31.3     18.05   16.92 ~ 11 0
79 GALEX J103645.9-273126 GiC 10 36 45.85 -27 31 24.2     17.87   16.94 ~ 13 0
80 HCC 70 G 10 36 47.3 -27 24 13     21.33   20.53 ~ 3 0
81 HCC 111 G 10 36 47.3 -27 13 30     23.36   22.41 ~ 3 0
82 HCC 57 G 10 36 48.2 -27 28 52     20.66   19.71 ~ 3 0
83 HCC 72 G 10 36 48.3 -27 26 47     21.44   20.44 ~ 3 0
84 LEDA 141485 GiC 10 36 48.8 -27 30 01     17.77   16.68 ~ 15 0
85 6dFGS gJ103649.1-272319 GiC 10 36 49.0741621584 -27 23 19.152425724   16.92 15.81 15.81 14.63 ~ 19 0
86 [MMH2008] 7a-31 ? 10 36 49.470 -27 13 26.26     21.67   20.65 ~ 1 0
87 HCC 98 G 10 36 49.9 -27 19 47     22.15   21.50 ~ 3 0
88 LEDA 753828 GiC 10 36 50.2 -27 30 46     17.77   16.79 ~ 10 0
89 HCC 30 GiC 10 36 50.73 -27 23 01.2     18.36   17.48 ~ 6 0
90 HCC 91 G 10 36 52.1 -27 31 47     21.88   20.95 ~ 3 0
91 LEDA 141487 GiC 10 36 52.5 -27 32 15     16.82   15.72 ~ 15 0
92 HCC 97 G 10 36 53.8 -27 31 36     22.14   21.46 ~ 3 0
93 HCC 52 G 10 36 55.4 -27 35 55     20.25   19.09 ~ 3 0
94 HCC 93 G 10 36 56.5 -27 30 25     22.00   21.07 ~ 3 0
95 2MASX J10365705-2734041 GiC 10 36 57.0240013584 -27 34 04.344905424     16.40   15.20 ~ 15 0
96 HCC 89 G 10 36 57.3 -27 35 13     21.76   21.08 ~ 3 0
97 HCC 34 GiC 10 36 58.6 -27 34 26     19.02   18.08 ~ 4 0
98 HCC 29 GiC 10 37 00.14 -27 29 53.0     18.20   17.14 ~ 8 0
99 NGC 3312 LIN 10 37 02.5165552728 -27 33 53.924090760   12.63 13.96     ~ 106 0
100 HCC 53 G 10 37 03.7 -27 35 48     20.30   19.03 ~ 3 0
101 HCC 48 GiC 10 37 11.3 -27 31 30     20.01   18.87 ~ 4 0
102 HCC 59 G 10 37 12.5 -27 29 52     20.73   19.70 ~ 3 0
103 HCC 25 GiC 10 37 13.68 -27 30 24.7     17.87   16.76 ~ 6 0
104 HCC 21 GiC 10 37 17.28 -27 35 33.5     17.57   16.48 ~ 6 0
105 ESO 501-49 GiG 10 37 19.9955781744 -27 33 34.152517548   15.20 14.21 13.82 13.01 ~ 41 0
106 HCC 46 G 10 37 23.1 -27 35 57     19.93   19.04 ~ 3 0
107 NGC 3316 GiG 10 37 37.3173763464 -27 35 38.848143372   13.66 13.03 12.20 11.77 ~ 48 0
108 HCC 15 GiC 10 37 38.08 -27 35 58.8     16.10   14.98 ~ 6 0
109 HCC 50 G 10 37 39.1 -27 33 42     20.11   19.24 ~ 3 0
110 HCC 101 G 10 37 39.5 -27 34 06     22.27   21.17 ~ 3 0
111 HCC 40 GiC 10 37 39.6 -27 35 33     19.76   18.75 ~ 3 0
112 HCC 66 G 10 37 41.6 -27 32 22     21.10   20.16 ~ 3 0
113 LEDA 141493 GiC 10 37 47.0 -27 34 22     16.53   15.49 ~ 11 0
114 HCC 33 G 10 37 48.9 -27 33 03     18.53   17.59 ~ 3 0
115 HCC 56 G 10 37 51.2 -27 32 39     20.56   19.79 ~ 3 0
116 HCC 107 G 10 37 52.4 -27 32 20     22.70   21.89 ~ 3 0
117 HCC 49 G 10 37 56.0 -27 32 42     20.05   19.11 ~ 3 0
118 HCC 105 G 10 37 58.5 -27 31 17     22.62   21.84 ~ 3 0
119 HCC 60 G 10 38 03.0 -27 35 47     20.73   19.86 ~ 3 0
120 HCC 31 GiC 10 38 04.63 -27 32 43.9     18.42   17.44 ~ 5 0
121 HCC 51 G 10 38 04.7 -27 32 23     20.12   19.06 ~ 3 0
122 HCC 63 G 10 38 06.3 -27 35 25     20.92   20.00 ~ 3 0
123 HCC 104 G 10 38 07.0 -27 32 03     22.59   21.72 ~ 3 0
124 HCC 85 G 10 38 11.9 -27 35 47     21.70   20.69 ~ 3 0
125 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6249 0
126 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1016 2
127 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4501 2
128 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3229 0
129 NAME Local Group GrG ~ ~           ~ 7638 0

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2022.05.23-05:05:13

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