2014ApJ...789..147W

Query : 2014ApJ...789..147W

2014ApJ...789..147W - Astrophys. J., 789, 147 (2014/July-2)

The star formation histories of local group dwarf galaxies. I. Hubble Space Telescope/Wide Field Planetary Camera 2 observations.

WEISZ D.R., DOLPHIN A.E., SKILLMAN E.D., HOLTZMAN J., GILBERT K.M., DALCANTON J.J. and WILLIAMS B.F.

Abstract (from CDS):

We present uniformly measured star formation histories (SFHs) of 40 Local Group (LG) dwarf galaxies based on color-magnitude diagram (CMD) analysis from archival Hubble Space Telescope imaging. We demonstrate that accurate SFHs can be recovered from CMDs that do not reach the oldest main sequence turn-off (MSTO), but emphasize that the oldest MSTO is critical for precisely constraining the earliest epochs of star formation. We find that: (1) the average lifetime SFHs of dwarf spheroidals (dSphs) can be approximated by an exponentially declining SFH with τ ∼ 5 Gyr; (2) lower luminosity dSphs are less likely to have extended SFHs than more luminous dSphs; (3) the average SFHs of dwarf irregulars (dIrrs), transition dwarfs, and dwarf ellipticals can be approximated by the combination of an exponentially declining SFH (τ ∼ 3-4 Gyr) for lookback ages >10-12 Gyr ago and a constant SFH thereafter; (4) the observed fraction of stellar mass formed prior to z = 2 ranges considerably (80% for galaxies with M < 105 M☉ to 30% for galaxies with M > 107 M☉) and is largely explained by environment; (5) the distinction between "ultra-faint" and "classical" dSphs is arbitrary; (6) LG dIrrs formed a significantly higher fraction of stellar mass prior to z = 2 than the Sloan Digital Sky Survey galaxies from Leitner and the SFHs from the abundance matching models of Behroozi et al. This may indicate higher than expected star formation efficiencies at early times in low mass galaxies. Finally, we provide all the SFHs in tabulated electronic format for use by the community.

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

VizieR on-line data: <Available at CDS (J/ApJ/789/147): table2.dat table5.dat table6.dat>

Simbad objects: 62

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Number of rows : 62
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
3 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
4 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
5 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
6 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
7 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
8 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
9 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
10 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
11 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
12 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
13 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
14 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
15 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
16 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
17 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
18 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
19 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
20 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
21 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
22 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
23 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
24 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
25 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
26 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
27 Z 264-88 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 141 0
28 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
29 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
30 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
31 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
32 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
33 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
34 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
35 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
36 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
37 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
38 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
39 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
40 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
41 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
42 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
43 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
44 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
45 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
46 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
47 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
48 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
49 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
50 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
51 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
52 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
53 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
54 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
55 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
56 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
57 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
58 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
59 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
60 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
61 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
62 NAME Local Group GrG ~ ~           ~ 9325 0

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