2018A&A...616A..96R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:07:41

2018A&A...616A..96R - Astronomy and Astrophysics, volume 616A, 96-96 (2018/8-1)

Pushing back the limits: detailed properties of dwarf galaxies in a ΛCDM universe.

REVAZ Y. and JABLONKA P.

Abstract (from CDS):

We present the results of a set of high-resolution chemo-dynamical simulations of dwarf galaxies in a ΛCDM cosmology. Out of an original (3.4Mpc/h)3 cosmological box, a sample of 27 systems are re-simulated from z=70 to z=0 using a zoom-in technique. Gas and stellar properties are confronted to the observations in the greatest details: in addition to the galaxy global properties, we investigated the model galaxy velocity dispersion profiles, half-light radii, star formation histories, stellar metallicity distributions, and [Mg/Fe] abundance ratios. The formation and sustainability of the metallicity gradients and kinematically distinct stellar populations are also tackled. We show how the properties of six Local Group dwarf galaxies, NGC 6622, Andromeda II, Sculptor, Sextans, Ursa Minor and Draco are reproduced, and how they pertain to three main galaxy build-up modes. Our results indicate that the interaction with a massive central galaxy could be needed for a handful of Local Group dwarf spheroidal galaxies only, the vast majority of the systems and their variety of star formation histories arising naturally from a ΛCDM framework. We find that models fitting well the local Group dwarf galaxies are embedded in dark haloes of mass between 5x108 to a few 109M, without any missing satellite problem. We confirm the failure of the abundance matching approach at the mass scale of dwarf galaxies. Some of the observed faint however gas-rich galaxies with residual star formation, such as Leo T and Leo P, remain challenging. They point out the need of a better understanding of the UV-background heating.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: general - galaxies: dwarf - Galaxy: evolution - Galaxy: formation - galaxies: structure

Simbad objects: 41

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Number of rows : 41

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 575 2
2 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 706 2
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 116 0
4 ESO 294-10 G 00 26 33.4 -41 51 22   15.76 15.3 14.97   ~ 95 2
5 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 37 0
6 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 729 1
7 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10904 1
8 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 304 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
10 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 114 0
11 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1116 4
12 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 342 0
13 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 65 0
14 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 448 2
15 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
17 UGC 4879 G 09 16 02.0197873600 +52 50 42.052874443   14.0 13.2     ~ 104 0
18 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 306 0
19 NAME Antlia B G 09 48 56.08 -25 59 24.0           ~ 16 0
20 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 695 2
21 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1045 1
22 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 653 2
23 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 706 0
24 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 152 0
25 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 736 0
26 UGC 6817 G 11 50 52.984 +38 52 50.92   13.72 13.9 13.39   ~ 152 0
27 NGC 4163 LSB 12 12 09.108 +36 10 03.13 14.33 13.70 13.2 12.98   ~ 184 0
28 UGCA 276 G 12 14 57.9 +36 13 07 17.66 16.85 16.22 15.92   ~ 88 1
29 IC 3104 G 12 18 46.1 -79 43 33   13.65 12.8 12.04   ~ 71 1
30 UGC 7577 GiG 12 27 41.8803124881 +43 29 58.140216428 13.75 13.10 12.7 12.33   ~ 226 0
31 LEDA 2807150 LSB 13 54 33.356 +04 14 39.66   16.8 17.1     ~ 70 0
32 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 81 0
33 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 255 0
34 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1178 0
35 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1165 1
36 NGC 6622 GiP 18 13 00.21 +68 21 12.4   16       ~ 37 0
37 IC 4682 GiG 18 16 25.657 -71 34 52.78   13.25   11.71 11.9 ~ 37 0
38 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 275 1
39 NAME Aqr Galaxy GiC 20 48 01.194 -52 58 08.79   15.70       ~ 16 0
40 IC 5152 G 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 219 1
41 NAME Local Group GrG ~ ~           ~ 6973 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:07:41

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