2023MNRAS.525..325K

Query : 2023MNRAS.525..325K

2023MNRAS.525..325K - Mon. Not. R. Astron. Soc., 525, 325-334 (2023/October-2)

Densities and mass assembly histories of the Milky Way satellites are not a challenge to ΛCDM.

KRAVTSOV A. and WU Z.

Abstract (from CDS):

We use the GRUMPY galaxy formation model based on a suite of zoom-in, high-resolution, dissipationless Λ Cold Dark Matter (ΛCDM) simulations of the Milky Way (MW) sized haloes to examine total matter density within the half-mass radius of stellar distribution, ρtot(< r1/2), of satellite dwarf galaxies around the MW hosts and their mass assembly histories. We compare model results to ρtot(< r1/2) estimates for observed dwarf satellites of the Milky Way spanning their entire luminosity range. We show that observed MW dwarf satellites exhibit a trend of decreasing total matter density within a half-mass radius, ρtot(< r1/2), with increasing stellar mass. This trend is in general agreement with the trend predicted by the model. None of the observed satellites are overly dense compared to the results of our ΛCDM-based model. We also show that although the halo mass of many satellite galaxies is comparable to the halo mass of the MW progenitor at z ≳ 10, at these early epochs halos that survive as satellites to z = 0 are located many virial radii away from the MW progenitors and thus do not have a chance to merge with it. Our results show that neither the densities estimated in observed Milky Way satellites nor their mass assembly histories pose a challenge to the ΛCDM model. In fact, the broad agreement between density trends with the stellar mass of the observed and model galaxies can be considered as yet another success of the model.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: dwarf - galaxies: haloes

Simbad objects: 55

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Number of rows : 55
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 Tuc IV G 00 02.9 -60 51           ~ 90 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
4 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
5 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
6 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
7 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
8 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
10 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
11 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
12 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
13 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
14 NAME Ret GlC 04 36 10.15 -58 51 34.8   14.00 14.25 13.50   ~ 177 1
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
16 NAME Col I G 05 31.4 -28 02           ~ 60 0
17 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
18 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
19 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
20 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
21 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
22 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
23 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
24 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
25 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
26 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
27 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
28 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
29 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
30 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
31 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
32 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
33 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
34 NAME Centaurus I G 12 38 20 -40 54.1     14.78     ~ 29 0
35 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
36 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
37 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
38 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
39 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
40 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
41 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
42 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
43 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
44 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
45 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
46 NAME Pegasus IV G 21 54 09 +26 37.2           ~ 15 0
47 NAME Gru II G 22 04.1 -46 26           ~ 110 0
48 NAME Pegasus III LSB 22 24 22.6 +05 25 12           ~ 69 0
49 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
50 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
51 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
52 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
53 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
54 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
55 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

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