2015MNRAS.450.3920B

Query : 2015MNRAS.450.3920B

2015MNRAS.450.3920B - Mon. Not. R. Astron. Soc., 450, 3920-3934 (2015/July-2)

Expanded haloes, abundance matching and too-big-to-fail in the Local Group.

BROOK C.B. and DI CINTIO A.

Abstract (from CDS):

Observed kinematical data of 40 Local Group (LG) members are used to derive the dark matter halo mass of such galaxies. Haloes are selected from the theoretically expected LG mass function and two different density profiles are assumed, a standard universal cuspy model and a mass-dependent profile which accounts for the effects of baryons in modifying the dark matter distribution within galaxies. The resulting relations between stellar and halo mass are compared with expectations from abundance matching. Using a universal cuspy profile, the ensemble of LG galaxies is fit in relatively low-mass haloes, leaving `dark' many massive haloes of Mhalo ≳ 1010 M☉: this reflects the `too-big-to-fail' problem and results in a Mstar-Mhalo relation that differs from abundance matching predictions. Moreover, the star formation efficiency of isolated LG galaxies increases with decreasing halo mass when adopting a cuspy model. By contrast, using the mass-dependent density profile, dwarf galaxies with Mstar ≳ 106 M☉ are assigned to more massive haloes, which have a central cored distribution of dark matter: the `too-big-to-fail' problem is alleviated, the resultant Mstar-Mhalo relation follows abundance matching predictions down to the completeness limit of current surveys, and the star formation efficiency of isolated members decreases with decreasing halo mass, in agreement with theoretical expectations. Finally, the cusp/core space of LG galaxies is presented, providing a framework to understand the non-universality of their density profiles.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: dwarf - galaxies: formation - galaxies: haloes - Local Group

Simbad objects: 59

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Number of rows : 59
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 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
4 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
5 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
6 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
7 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
8 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
9 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 59 0
10 NAME Andromeda XXX G 00 36 34.90 +49 38 48.0           ~ 59 0
11 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
12 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
13 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
14 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
15 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
16 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
17 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
18 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
19 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
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 Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
23 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
24 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
25 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
26 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
27 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
28 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
29 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
30 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
31 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
32 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
33 Z 264-88 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 141 0
34 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
35 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
36 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
37 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
38 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
39 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
40 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
41 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
42 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
43 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
44 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
45 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
46 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
47 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
48 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
49 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
50 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
51 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
52 NAME Lacerta I G 22 58 16.3 +41 17 28           ~ 53 0
53 MCG-05-55-012 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 163 0
54 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
55 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
56 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
57 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
58 NAME Andromeda XXIX G 23 58 55.6 +30 45 20     16.0     ~ 61 0
59 NAME Local Group GrG ~ ~           ~ 9325 0

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