2015ApJ...804..136W

Query : 2015ApJ...804..136W

2015ApJ...804..136W - Astrophys. J., 804, 136 (2015/May-2)

The star formation histories of local group dwarf galaxies. III. Characterizing quenching in low-mass galaxies.

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 explore the quenching of low-mass galaxies (104 ≲ M* ≲ 108 M☉) as a function of lookback time using the star formation histories (SFHs) of 38 Local Group dwarf galaxies. The SFHs were derived by analyzing color-magnitude diagrams of resolved stellar populations in archival Hubble Space Telescope/Wide Field Planetary Camera 2 imaging. We find: (1) lower-mass galaxies quench earlier than higher-mass galaxies; (2) inside of Rvirial there is no correlation between a satellite's current proximity to a massive host and its quenching epoch; and (3) there are hints of systematic differences in the quenching times of M31 and Milky Way (MW) satellites, although the sample size and uncertainties in the SFHs of M31 dwarfs prohibit definitive conclusions. Combined with results from the literature, we qualitatively consider the redshift evolution (z = 0-1) of the quenched galaxy fraction over ∼7 dex in stellar mass (104 ≲ M* ≲ 1011.5 M☉). The quenched fraction of all galaxies generally increases toward the present, with both the lowest and highest-mass systems exhibiting the largest quenched fractions at all redshifts. In contrast, galaxies between M* ∼ 108-1010 M☉ have the lowest quenched fractions. We suggest that such intermediate-mass galaxies are the least efficient at quenching. Finally, we compare our quenching times with predictions for infall times for low-mass galaxies associated with the MW. We find that some of the lowest-mass satellites (e.g., CVn II, Leo IV) may have been quenched before infall, while higher-mass satellites (e.g., Leo I, Fornax) typically quench ∼1-4 Gyr after infall.

Abstract Copyright: ∼

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

Simbad objects: 44

goto Full paper

goto View the references in ADS

Number of rows : 44
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 M31 Group GrG 00 47 28.6 +40 17 23           ~ 65 0
14 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
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 LEDA 9140 G 02 24 40.9 -73 30 48   16.0       ~ 41 0
23 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
24 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
25 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
26 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
27 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
28 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
29 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
30 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
31 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
32 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
33 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
34 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 115 0
35 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
36 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
37 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
38 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
39 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
40 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
41 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
42 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
43 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
44 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2015ApJ...804..136W and select 'bookmark this link' or equivalent in the popup menu