2011ApJ...739....5W


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST03:57:21

2011ApJ...739....5W - Astrophys. J., 739, 5 (2011/September-3)

The ACS nearby galaxy survey treasury. VIII. The global star formation histories of 60 dwarf galaxies in the local volume.

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

Abstract (from CDS):

We present uniformly measured star formation histories (SFHs) of 60 nearby (D ≲ 4 Mpc) dwarf galaxies based on color-magnitude diagrams of resolved stellar populations from images taken with the Hubble Space Telescope and analyzed as part of the ACS Nearby Galaxy Survey Treasury program (ANGST). This volume-limited sample contains 12 dwarf spheroidal (dSph)/dwarf elliptical (dE), 5 dwarf spiral, 28 dwarf irregular (dI), 12 dSph/dI (transition), and 3 tidal dwarf galaxies. The sample spans a range of ∼10 mag in MB and covers a wide range of environments, from highly interacting to truly isolated. From the best-fit SFHs, we find three significant results for dwarf galaxies in the ANGST volume: (1) the majority of dwarf galaxies formed the bulk of their mass prior to z ∼ 1, regardless of current morphological type; (2) the mean SFHs of dIs, transition dwarf galaxies (dTrans), and dSphs are similar over most of cosmic time, and only begin to diverge a few Gyr ago, with the clearest differences between the three appearing during the most recent 1 Gyr; and (3) the SFHs are complex and the mean values are inconsistent with simple SFH models, e.g., single bursts, constant star formation rates (SFRs), or smooth, exponentially declining SFRs. The mean SFHs show clear divergence from the cosmic SFH at z ≲ 0.7, which could be evidence that low-mass systems have experienced delayed star formation relative to more massive galaxies. The sample shows a strong density-morphology relationship, such that the dSphs in the sample are less isolated than the dIs. We find that the transition from a gas-rich to gas-poor galaxy cannot be solely due to internal mechanisms such as stellar feedback, and instead is likely the result of external mechanisms, e.g., ram pressure and tidal stripping and tidal forces. In terms of their environments, SFHs, and gas fractions, the majority of the dTrans appear to be low-mass dIs that simply lack Hα emission, similar to Local Group (LG) dTrans DDO 210. However, a handful of dTrans have remarkably low gas fractions, suggesting that they have nearly exhausted their gas supply, analogous to LG dTrans such as Phoenix. Finally, we have also included extensive exploration of uncertainties in the SFH recovery method, including the optimization of time resolution, the effects of photometric depth, and impact of systematic uncertainties due to the limitations in current stellar evolution models.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: star formation - galaxies: stellar content - Hertzsprung-Russell and C-M diagrams

Simbad objects: 84

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Number of rows : 84

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 685 2
2 ESO 410-5 LSB 00 15 31.45 -32 10 47.3   15.32 14.9 14.58   ~ 84 1
3 NAME Sculptor dE1 GiG 00 23 51.7 -24 42 18   17.73       ~ 53 1
4 ESO 294-10 G 00 26 33.4 -41 51 22   15.76 15.3 14.97   ~ 93 2
5 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 603 1
6 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 711 1
7 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10562 1
8 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2857 2
9 ESO 540-30 G 00 49 21.1 -18 04 34   16.45   15.33   ~ 68 1
10 ESO 540-31 G 00 49 49.3 -21 00 58 16.11 15.64 15.36 14.8 15.5 ~ 113 1
11 ESO 540-32 LSB 00 50 24.5 -19 54 23 17.44 16.54 16.01 15.70   ~ 62 1
12 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9091 1
13 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1263 2
14 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 351 0
15 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 431 2
16 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1361 1
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14325 1
18 LEDA 95597 LSB 06 47 45.6 +80 07 27   16.4       ~ 58 0
19 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 687 0
20 UGCA 133 G 07 34 11.5 +66 52 47 16.40 15.48 14.80 14.76   ~ 63 0
21 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1570 1
22 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 669 2
23 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 183 1
24 UGC 4459 GiG 08 34 07.29 +66 10 54.6 15.39 15.03 14.70 14.49   ~ 283 2
25 UGC 4483 GiG 08 37 03.29 +69 46 29.2 15.70 15.46 14.98 14.89   ~ 255 0
26 UGC 4879 G 09 16 02.0197873600 +52 50 42.052874443   14.0 13.2     ~ 98 0
27 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 310 1
28 NAME F8D1 G 09 44 47.1 +67 26 19   14.60 13.85     ~ 55 0
29 NAME F6D1 GiG 09 45 10.0 +68 45 54   17.5       ~ 38 0
30 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 567 1
31 NAME F12D1 G 09 50 10.0 +67 30 24   15.6       ~ 43 1
32 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 81 1
33 NAME M 81-82 Group GrG 09 55 +69.1           ~ 615 0
34 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3888 5
35 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5213 6
36 LEDA 28731 G 09 57 03.0 +68 35 31   15.17       ~ 93 1
37 UGC 5336 G 09 57 32.1 +69 02 46 15.19 15.15 14.10 14.12   ~ 280 4
38 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 454 0
39 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 679 2
40 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 671 0
41 LEDA 29231 G 10 04 40.3 +68 15 20   17.43 16.72     ~ 62 0
42 UGC 5428 G 10 05 06.2 +66 33 31 17.89 16.82 16.09 15.73   ~ 88 1
43 UGC 5442 G 10 07 01.70 +67 49 38.4 17.09 15.73 15.07 14.81   ~ 71 1
44 NAME IKN G 10 08 05.9 +68 23 57           ~ 58 0
45 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 637 2
46 LEDA 4689216 GiG 10 21 25.2 +71 06 58           ~ 43 0
47 LEDA 30664 G 10 26 28.0 +67 39 35   15.8       ~ 66 1
48 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 590 1
49 UGC 5692 GiG 10 30 36.58 +70 37 06.0 14.81 13.69 13.01 12.73   ~ 109 0
50 LEDA 32667 LSB 10 52 55.1 +69 32 46   17.2       ~ 74 1
51 NGC 3741 G 11 36 05.754 +45 17 02.96 15.01 14.55 14.23 14.06   ~ 177 0
52 UGC 6817 G 11 50 52.984 +38 52 50.92   13.72 13.9 13.39   ~ 147 0
53 NGC 4163 LSB 12 12 09.108 +36 10 03.13 14.33 13.70 13.2 12.98   ~ 176 0
54 NGC 4190 LSB 12 13 44.1699744302 +36 37 53.391666031 13.88 13.40 13.25 12.86   ~ 176 0
55 ESO 321-14 G 12 13 49.6 -38 13 52 16.32 15.70 15.35 15.20 15.2 ~ 71 0
56 UGCA 276 G 12 14 57.9 +36 13 07 17.66 16.85 16.22 15.92   ~ 84 1
57 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 846 1
58 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 356 1
59 UGC 7577 GiG 12 27 41.8803124881 +43 29 58.140216428 13.75 13.10 12.7 12.33   ~ 217 0
60 NAME CVn I dwA GiC 12 38 40.1 +32 45 59 16.91 16.66 16.73 16.62   ~ 186 0
61 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1181 3
62 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 433 0
63 ESO 269-37 G 13 03 33.6 -46 35 05   16.29   14.95   ~ 38 1
64 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1229 2
65 UGC 8201 G 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 216 1
66 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3886 3
67 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 156 0
68 UGC 8651 G 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 132 0
69 ESO 325-11 G 13 45 00.7 -41 51 37   14.02   13.49 12.9 ~ 86 0
70 NAME TR 1346-35 GiG 13 49 17.5116725183 -36 03 48.862602286   11.00   10.11   ~ 94 1
71 UGC 8760 G 13 50 51.3121098935 +38 01 14.956142286 15.56 14.78   14.33   ~ 127 0
72 LEDA 2807150 LSB 13 54 33.356 +04 14 39.66   16.8 17.1     ~ 67 0
73 UGC 8833 G 13 54 48.52 +35 50 14.5   16.5   15.20   ~ 94 1
74 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 77 0
75 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 249 0
76 UGC 9240 G 14 24 43.0755108543 +44 31 31.754423687 14.24 13.54 13.17 13.07   ~ 176 0
77 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1136 0
78 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 92 0
79 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 216 4
80 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 382 1
81 IC 5152 G 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 216 1
82 ESO 407-18 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 138 0
83 LEDA 2807157 GiG 23 45 35.177 +38 43 05.09   16.7 15.2     ~ 74 1
84 NAME Local Group GrG ~ ~           ~ 6660 0

    Equat.    Gal    SGal    Ecl

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2019.10.20-03:57:21

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