2014A&A...562A.134B


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET15:33:18

2014A&A...562A.134B - Astronomy and Astrophysics, volume 562A, 134-134 (2014/2-1)

A lower bound on the Milky Way mass from general phase-space distribution function models.

BRATEK L., SIKORA S., JALOCHA J. and KUTSCHERA M.

Abstract (from CDS):

We model the phase-space distribution of the kinematic tracers using general, smooth distribution functions to derive a conservative lower bound on the total mass within ≃150-200kpc. By approximating the potential as Keplerian, the phase-space distribution can be simplified to that of a smooth distribution of energies and eccentricities. Our approach naturally allows for calculating moments of the distribution function, such as the radial profile of the orbital anisotropy. We systematically construct a family of phase-space functions with the resulting radial velocity dispersion overlapping with the one obtained using data on radial motions of distant kinematic tracers, while making no assumptions about the density of the tracers and the velocity anisotropy parameter β regarded as a function of the radial variable. While there is no apparent upper bound for the Milky Way mass, at least as long as only the radial motions are concerned, we find a sharp lower bound for the mass that is small. In particular, a mass value of 2.4x1011M, obtained in the past for lower and intermediate radii, is still consistent with the dispersion profile at larger radii. Compared with much greater mass values in the literature, this result shows that determining the Milky Way mass is strongly model-dependent. We expect a similar reduction of mass estimates in models assuming more realistic mass profiles.

Abstract Copyright:

Journal keyword(s): techniques: radial velocities - Galaxy: halo - Galaxy: kinematics and dynamics - Galaxy: fundamental parameters - methods: numerical

VizieR on-line data: <Available at CDS (J/A+A/562/A134): table1.dat>

Status in Simbad:  will not be processed

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10680 1
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 174 0
3 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 296 0
4 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 298 0
5 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 281 1
6 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 338 1
7 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1021 1
8 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 255 1
9 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 243 0
10 NAME Leo V G 11 31 09.60 +02 13 12.0     16.0     ~ 152 0
11 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 375 1
12 NAME CVn I dwA GiC 12 38 40.1 +32 45 59 16.91 16.66 16.73 16.62   ~ 188 0
13 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 200 2
14 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 181 0
15 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 320 0
16 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 314 0
17 NAME Her Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 261 1
18 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1134 1
19 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11190 0
20 NAME GD-1 Stream St* ~ ~           ~ 157 0
21 NAME Local Group GrG ~ ~           ~ 6773 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-15:33:18

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