2019MNRAS.490..231K

Query : 2019MNRAS.490..231K

2019MNRAS.490..231K - Mon. Not. R. Astron. Soc., 490, 231-242 (2019/November-3)

Too big to fail in light of Gaia.

KAPLINGHAT M., VALLI M. and YU H.-B.

Abstract (from CDS):

We point out an anticorrelation between the central dark matter (DM) densities of the bright Milky Way dwarf spheroidal galaxies (dSphs) and their orbital pericenter distances inferred from Gaia data. The dSphs that have not come close to the Milky Way centre (like Fornax, Carina and Sextans) are less dense in DM than those that have come closer (like Draco and Ursa Minor). The same anticorrelation cannot be inferred for the ultrafaint dSphs due to large scatter, while a trend that dSphs with more extended stellar distributions tend to have lower DM densities emerges with ultrafaints. We discuss how these inferences constrain proposed solutions to the Milky Way's too-big-to-fail problem and provide new clues to decipher the nature of DM.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: kinematics and dynamics - dark matter

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 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
3 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
4 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
5 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
8 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
9 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
10 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
11 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
12 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
13 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
14 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
15 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
16 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
17 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
18 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
19 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
20 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
21 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
22 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
23 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
24 NAME Local Group GrG ~ ~           ~ 9325 0

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