2011ApJ...743....8W

Query : 2011ApJ...743....8W

2011ApJ...743....8W - Astrophys. J., 743, 8 (2011/December-2)

How typical are the Local Group dwarf galaxies?

WEISZ D.R., DOLPHIN A.E., DALCANTON J.J., SKILLMAN E.D., HOLTZMAN J., WILLIAMS B.F., GILBERT K.M., SETH A.C., COLE A., GOGARTEN S.M., ROSEMA K., KARACHENTSEV I.D., McQUINN K.B.W. and ZARITSKY D.

Abstract (from CDS):

We compare the cumulative star formation histories (SFHs) of Local Group (LG) dwarf galaxies with those in the volume-limited ACS Nearby Galaxy Survey Treasury (ANGST) sample (D ≲ 4 Mpc), in order to understand how typical the LG dwarf galaxies are relative to those in the nearby universe. The SFHs were derived in a uniform manner from high-quality optical color-magnitude diagrams constructed from Hubble Space Telescope imaging. We find that the mean cumulative SFHs of the LG dwarfs are comparable to the mean cumulative SFHs of the ANGST sample for the three different morphological types (dwarf spheroidals/ellipticals: dSph/dE; dwarf irregulars: dI; transition dwarfs: dTrans). We also discuss effects such as population gradients and systematic uncertainties in the stellar models that may influence the derived SFHs. Both the ANGST and LG dwarf galaxies show a consistent and strong morphology-density relationship, emphasizing the importance of environment in the evolution of dwarf galaxies. Specifically, we confirm that dIs are found at lower densities and higher luminosities than dSphs, within this large sample. We also find that dTrans are located in similar environments to those occupied by dwarf irregular galaxies, but have systematically lower luminosities that are more comparable to those of dwarf spheroidals. The similarity of the SFHs and morphology-density relationships of the LG and ANGST dwarf galaxies suggests that the LG dwarfs are a good representation of dwarf galaxies in the local universe.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: formation - galaxies: stellar content - Local Group

Simbad objects: 103

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Number of rows : 103
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-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 ESO 349-31 AG? 00 08 13.1536 -34 34 47.836   15.54   14.99   ~ 156 3
3 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
4 ESO 410-5 LSB 00 15 31.21 -32 10 49.9   15.32 14.9 14.58   ~ 120 1
5 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
6 NAME Sculptor dE1 GiG 00 23 51.7 -24 42 18   17.73       ~ 71 1
7 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
8 ESO 294-10 AG? 00 26 33.37 -41 51 19.1   15.76 15.3 14.97   ~ 122 2
9 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
10 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
11 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
12 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
13 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
14 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
15 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
16 ESO 540-30 AG? 00 49 20.96 -18 04 31.5   16.45   15.33   ~ 92 1
17 MCG-04-03-019 G 00 49 49.3 -21 00 58 16.11 15.64 15.36 14.8 15.5 ~ 144 1
18 ESO 540-32 LSB 00 50 24.5 -19 54 23 17.44 16.54 16.01 15.70   ~ 79 1
19 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
20 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
21 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
22 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
23 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
24 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
25 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
26 IC 342 AGN 03 46 48.514 +68 05 45.98   10.5       ~ 1579 1
27 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
28 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
29 LEDA 95597 LSB 06 47 45.6 +80 07 27   16.4       ~ 74 0
30 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
31 UGCA 133 G 07 34 11.5 +66 52 47 16.40 15.48 14.80 14.76   ~ 93 0
32 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
33 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
34 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 209 1
35 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
36 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
37 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
38 NAME F8D1 G 09 44 47.1 +67 26 19   14.60 13.85     ~ 80 0
39 NAME F6D1 GiG 09 45 10.0 +68 45 54   17.5       ~ 53 0
40 NAME F12D1 G 09 50 10.0 +67 30 24   15.6       ~ 58 1
41 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 97 1
42 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
43 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
44 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
45 LEDA 28731 G 09 57 02.7 +68 35 30   15.17       ~ 119 1
46 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
47 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
48 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
49 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
50 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
51 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
52 LEDA 29231 G 10 04 40.3 +68 15 20   17.43 16.72     ~ 77 0
53 UGC 5428 AG? 10 05 06.40 +66 33 32.0 17.89 16.82 16.09 15.73   ~ 113 1
54 UGC 5442 AG? 10 07 01.90 +67 49 39.0 17.09 15.73 15.07 14.81   ~ 95 1
55 NAME IKN G 10 08 05.9 +68 23 57           ~ 82 0
56 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
57 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
58 LEDA 4689216 GiG 10 21 25.2 +71 06 58           ~ 62 0
59 DDO 78 G 10 26 27.9 +67 39 24   15.8       ~ 88 1
60 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
61 Z 333-35 GiG 10 30 35.03 +70 37 07.2 14.81 13.69 13.01 12.73   ~ 140 0
62 LEDA 32667 LSB 10 52 55.1 +69 32 46   17.2       ~ 88 1
63 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
64 NGC 3741 AG? 11 36 05.754 +45 17 02.96 15.01 14.55 14.23 14.06   ~ 237 0
65 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
66 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
67 NGC 4190 LSB 12 13 44.765 +36 38 02.49 13.88 13.40 13.25 12.86   ~ 224 0
68 ESO 321-14 AG? 12 13 48.8792 -38 14 00.250 16.32 15.70 15.35 15.20 15.2 ~ 92 0
69 UGCA 276 G 12 14 57.9 +36 13 07 17.66 16.85 16.22 15.92   ~ 105 1
70 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
71 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 415 1
72 Z 216-4 GiG 12 27 40.90 +43 29 44.0 13.75 13.10 12.7 12.33   ~ 270 0
73 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
74 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
75 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
76 ESO 269-37 AG? 13 03 33.1398 -46 35 10.765   16.29   14.95   ~ 48 1
77 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
78 Z 316-9 AG? 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 268 1
79 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
80 Z 271-48 EmG 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 218 0
81 Z 218-34 AG? 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 165 0
82 ESO 325-11 AG? 13 45 01.0528 -41 51 45.993   14.02   13.49 12.9 ~ 113 0
83 MCG-06-30-025 EmG 13 49 17.5109711256 -36 03 48.860478360   11.00   10.11   ~ 120 1
84 Z 190-66 AG? 13 50 51.3127548768 +38 01 14.958828876 15.56 14.78   14.33   ~ 161 0
85 LEDA 2807150 LSB 13 54 33.356 +04 14 39.66   16.8 17.1     ~ 89 0
86 MCG+06-31-023 AG? 13 54 48.8114 +35 50 07.775   16.5   15.20   ~ 123 1
87 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 94 0
88 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
89 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
90 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
91 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 115 0
92 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
93 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
94 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
95 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
96 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
97 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
98 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
99 MCG-05-55-012 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 163 0
100 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
101 LEDA 2807157 GiG 23 45 35.177 +38 43 05.09   16.7 15.2     ~ 93 1
102 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
103 NAME Local Group GrG ~ ~           ~ 9325 0

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