2020ApJ...894...10L

Query : 2020ApJ...894...10L

2020ApJ...894...10L - Astrophys. J., 894, 10-10 (2020/May-1)

Constraining the Milky Way mass profile with phase-space distribution of satellite galaxies.

LI Z.-Z., QIAN Y.-Z., HAN J., LI T.S., WANG W. and JING Y.P.

Abstract (from CDS):

We estimate the Milky Way (MW) halo properties using satellite kinematic data including the latest measurements from Gaia DR2. With a simulation-based 6D phase-space distribution function (DF) of satellite kinematics, we can infer halo properties efficiently and without bias, and handle the selection function and measurement errors rigorously in the Bayesian framework. Applying our DF from the EAGLE simulation to 28 satellites, we obtain an MW halo mass of M=1.23–0.18+0.21×1012M☉ and a concentration of c=9.4–2.1+2.8 with the prior based on the M-c relation. The inferred mass profile is consistent with previous measurements but with better precision and reliability due to the improved methodology and data. Potential improvement is illustrated by combining satellite data and stellar rotation curves. Using our EAGLE DF and best-fit MW potential, we provide much more precise estimates of the kinematics for those satellites with uncertain measurements. Compared to the EAGLE DF, which matches the observed satellite kinematics very well, the DF from the semi-analytical model based on the dark-matter-only simulation Millennium II (SAM-MII) over-represents satellites with small radii and velocities. We attribute this difference to less disruption of satellites with small pericenter distances in the SAM-MII simulation. By varying the disruption rate of such satellites in this simulation, we estimate a ∼5% scatter in the inferred MW halo mass among hydrodynamics-based simulations.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Milky Way mass - Milky Way dynamics - Milky Way dark matter halo - N-body simulations - Dwarf galaxies - Bayesian statistics - Hydrodynamical simulations - Proper motions

Simbad objects: 34

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Number of rows : 34
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
5 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
6 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
7 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
10 NAME Pic II G 06 44 43 -59 53.8           ~ 33 0
11 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
12 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
13 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
14 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
15 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
16 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
17 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
18 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
19 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
20 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
21 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
22 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
23 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
24 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
25 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
26 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
27 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
28 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
29 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
30 NAME Gru II G 22 04.1 -46 26           ~ 110 0
31 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
32 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
33 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
34 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0

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