2022ApJ...924..131S

Query : 2022ApJ...924..131S

2022ApJ...924..131S - Astrophys. J., 924, 131-131 (2022/January-2)

Galactic Mass estimates using dwarf galaxies as kinematic tracers.

SLIZEWSKI A., DUFRESNE X., MURDOCK K., EADIE G., SANDERSON R., WETZEL A. and JURIC M.

Abstract (from CDS):

New mass estimates and cumulative mass profiles with Bayesian credible regions for the Milky Way (MW) are found using the Galactic Mass Estimator (GME) code and dwarf galaxy (DG) kinematic data from multiple sources. GME takes a hierarchical Bayesian approach to simultaneously estimate the true positions and velocities of the DGs, their velocity anisotropy, and the model parameters for the Galaxy's total gravitational potential. In this study, we incorporate meaningful prior information from past studies and simulations. The prior distributions for the physical model are informed by the results of Eadie & Juric, who used globular clusters instead of DGs, as well as by the subhalo distributions of the Ananke Gaia-like surveys from Feedback in Realistic Environments-2 cosmological simulations (see Sanderson et al.). Using DGs beyond 45 kpc, we report median and 95% credible region estimates for r200 = 212.8 (191.12, 238.44) kpc, and for the total enclosed mass M200 = 1.19 (0.87, 1.68) x 1012 M☉ (adopting Δc = 200). Median mass estimates at specific radii are also reported (e.g., M (< 50 kpc) = 0.52 x 1012 M☉ and M (100 kpc) = 0.78 x 1012 M☉). Estimates are comparable to other recent studies using Gaia DR2 and DGs, but notably different from the estimates of Eadie & Juric. We perform a sensitivity analysis to investigate whether individual DGs and/or a more massive Large Magellanic Cloud on the order of 1011 M☉ may be affecting our mass estimates. We find possible supporting evidence for the idea that some DGs are affected by a massive LMC and are not in equilibrium with the MW.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Milky Way - Local Group - Milky Way physics - Dwarf galaxies - Globular star clusters - Bayesian statistics - Astrostatistics strategies - Hierarchical models - Posterior distribution - Galaxy kinematics - Halo stars - Milky Way dark matter halo

Simbad objects: 39

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Number of rows : 39
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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
3 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
4 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
5 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 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 Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
9 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
11 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
12 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
13 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
14 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
15 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
16 NAME Carina I HII Region HII 10 43 32 -59 35.0           ~ 59 0
17 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
18 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
19 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
20 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
21 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
22 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
23 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
24 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
25 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
26 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
27 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
28 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
29 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
30 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
31 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
32 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
33 NAME Sgr I Window reg 17 56 -29.0           ~ 71 0
34 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
35 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
36 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
37 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
38 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
39 NAME Local Group GrG ~ ~           ~ 9325 0

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