2017ApJ...850...16M

Query : 2017ApJ...850...16M

2017ApJ...850...16M - Astrophys. J., 850, 16-16 (2017/November-3)

A rogues' gallery of Andromeda's dwarf galaxies. I. A predominance of red horizontal branches.

MARTIN N.F., WEISZ D.R., ALBERS S.M., BERNARD E., COLLINS M.L.M., DOLPHIN A.E., FERGUSON A.M.N., IBATA R.A., LAEVENS B., LEWIS G.F., MACKEY A.D., McCONNACHIE A., RICH R.M. and SKILLMAN E.D.

Abstract (from CDS):

We present homogeneous, sub-horizontal branch photometry of 20 dwarf spheroidal satellite galaxies of M31 observed with the Hubble Space Telescope. Combining our new data for 16 systems with archival data in the same filters for another four, we show that Andromeda dwarf spheroidal galaxies favor strikingly red horizontal branches or red clumps down to ∼104.2 L☉ (MV ∼ -5.8). The age-sensitivity of horizontal branch stars implies that a large fraction of the M31 dwarf galaxies have extended star formation histories (SFHs), and appear inconsistent with early star formation episodes that were rapidly shutdown. Systems fainter than ∼105.5 L☉ show the widest range in the ratios and morphologies of red and blue horizontal branches, indicative of both complex SFHs and a diversity in quenching timescales and/or mechanisms, which is qualitatively different from what is currently known for faint Milky Way (MW) satellites of comparable luminosities. Our findings bolster similar conclusions from recent deeper data for a handful of M31 dwarf galaxies. We discuss several sources for diversity of our data such as varying halo masses, patchy reionization, mergers/accretion, and the environmental influence of M31 and the Milky Way on the early evolution of their satellite populations. A detailed comparison between the histories of M31 and MW satellites would shed signifiant insight into the processes that drive the evolution of low-mass galaxies. Such a study will require imaging that reaches the oldest main-sequence turnoffs for a significant number of M31 companions.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: photometry - Local Group - Local Group

Simbad objects: 40

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Number of rows : 40
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 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Andromeda XX G 00 07 30.70 +35 07 56.4     18.2     ~ 77 0
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
4 NAME Andromeda XXVI G 00 23 45.6 +47 54 58     17.3     ~ 76 0
5 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
6 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
7 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
8 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 59 0
9 NAME Andromeda XXX G 00 36 34.90 +49 38 48.0           ~ 59 0
10 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
11 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
12 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
13 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
14 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
15 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
16 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
17 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
18 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
19 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
20 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
21 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
22 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
23 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
24 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
25 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
26 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 64 0
27 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
28 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
29 NAME Andromeda XXXIII G 03 01 23.6 +40 59 18           ~ 43 0
30 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
31 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
32 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
33 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
34 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
35 NAME Lacerta I G 22 58 16.3 +41 17 28           ~ 53 0
36 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
37 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
38 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
39 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
40 NAME Local Group GrG ~ ~           ~ 9325 0

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