2019MNRAS.486.2679R

Query : 2019MNRAS.486.2679R

2019MNRAS.486.2679R - Mon. Not. R. Astron. Soc., 486, 2679-2694 (2019/June-3)

The velocity anisotropy of the Milky Way satellite system.

RILEY A.H., FATTAHI A., PACE A.B., STRIGARI L.E., FRENK C.S., GOMEZ F.A., GRAND R.J.J., MARINACCI F., NAVARRO J.F., PAKMOR R., SIMPSON C.M. and WHITE S.D.M.

Abstract (from CDS):

We analyse the orbital kinematics of the Milky Way (MW) satellite system utilizing the latest systemic proper motions for 38 satellites based on data from Gaia Data Release 2. Combining these data with distance and line-of-sight velocity measurements from the literature, we use a likelihood method to model the velocity anisotropy, β, as a function of Galactocentric distance and compare the MW satellite system with those of simulated MW-mass haloes from the APOSTLE (A Project Of Simulating The Local Environment) and Auriga simulation suites. The anisotropy profile for the MW satellite system increases from β ∼ -2 at r ∼ 20 kpc to β ∼ 0.5 at r ∼ 200 kpc, indicating that satellites closer to the Galactic centre have tangentially biased motions while those farther out have radially biased motions. The motions of satellites around APOSTLE host galaxies are nearly isotropic at all radii, while the β(r) profiles for satellite systems in the Auriga suite, whose host galaxies are substantially more massive in baryons than those in APOSTLE, are more consistent with that of the MW satellite system. This shape of the β(r) profile may be attributed to the central stellar disc preferentially destroying satellites on radial orbits, or intrinsic processes from the formation of the MW system.

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

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

Simbad objects: 46

goto Full paper

goto View the references in ADS

Number of rows : 46
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 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 Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
13 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 203 1
14 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
15 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
16 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
17 NAME Hydra I overdensity As* 08 56 +03.5           ~ 8 0
18 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
19 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
20 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
21 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
22 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
23 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
24 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
25 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
26 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
27 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
28 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
29 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
30 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
31 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
32 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
33 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
34 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
35 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
36 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
37 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
38 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
39 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
40 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
41 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
42 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
43 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
44 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
45 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
46 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2019MNRAS.486.2679R and select 'bookmark this link' or equivalent in the popup menu