2006ApJ...645.1054G


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET13:49:42

2006ApJ...645.1054G - Astrophys. J., 645, 1054-1061 (2006/July-2)

Fossils of reionization in the Local Group.

GNEDIN N.Y. and KRAVTSOV A.V.

Abstract (from CDS):

We use a combination of high-resolution gas dynamics simulations of high-redshift dwarf galaxies and dissipationless simulations of a Milky Way-sized halo to estimate the expected abundance and spatial distribution of the dwarf satellite galaxies that formed most of their stars around z∼8, evolving only little since then. Such galaxies can be considered ``fossils'' of the reionization era, and studying their properties could provide a direct window into the early, pre-reionization stages of galaxy formation. We show that ∼5%-15% of the objects existing at z∼8 do indeed survive until the present in a Milky Way-like environment without significant evolution. This implies that it is plausible that the fossil dwarf galaxies do exist in the Local Group. Because such galaxies form their stellar systems early during the period of active merging and accretion, they should have a spheroidal morphology regardless of their current distance from the host galaxy. Their observed counterparts should therefore be identified among the dwarf spheroidal galaxies. We show that both the expected luminosity function and the spatial distribution of dark matter halos that are likely to host fossil galaxies agree reasonably well with the observed distributions of the luminous (LV≳106 L) Local Group fossil candidates near the host galaxy (d≲200 kpc). However, the predicted abundance is substantially larger (by a factor of 2-3) for fainter galaxies (LV<106 L) at larger distances (d≳300 kpc). We discuss several possible explanations for this discrepancy.

Abstract Copyright:

Journal keyword(s): Cosmology: Theory - Galaxies: Dwarf - Galaxies: Evolution - Galaxies: Formation - Galaxies: Halos - Methods: Numerical - Stars: Formation

Nomenclature: Text: > And X first citation.

CDS comments: Paragr.2.2: EGB 0427 = EGB 0427+63, LGC 3 = [FS90] Leo 3.

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 206 0
2 NAME Andromeda III G 00 35 22.7 +36 30 17     14.4     ~ 275 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11104 1
4 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 309 0
5 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 150 1
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1140 4
7 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 102 1
8 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 190 0
9 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 349 0
10 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 462 2
11 UGCA 92 G 04 32 04.9 +63 36 49   16.15       ~ 117 0
12 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 196 1
13 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 657 2
14 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 722 0
15 UGC 5812 GiG 10 40 56.706 +12 28 25.89   15.6       ~ 24 0
16 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 748 0
17 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1196 0
18 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 95 0
19 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1181 1
20 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 269 0
21 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 217 0
22 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 423 1
23 NAME Peg dSph GiG 23 51 46.4 +24 35 11   14.5 13.2     ~ 219 2
24 NAME Local Group GrG ~ ~           ~ 7115 0

    Equat.    Gal    SGal    Ecl

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2020.12.02-13:49:42

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