Kinematic data of Galactic globular clusters Virtual Observatory Resource

Authors
  1. Eadie G.M.
  2. Harris W.E.
  3. Published by
    CDS
Abstract

We present mass and mass profile estimates for the Milky Way (MW) Galaxy using the Bayesian analysis developed by Eadie et al. (2015ApJ...806...54E) and using globular clusters (GCs) as tracers of the Galactic potential. The dark matter and GCs are assumed to follow different spatial distributions; we assume power-law model profiles and use the model distribution functions described in Evans et al. (1997MNRAS.286..315E) and Deason et al. (2012MNRAS.424L..44D). We explore the relationships between assumptions about model parameters and how these assumptions affect mass profile estimates. We also explore how using subsamples of the GC population beyond certain radii affect mass estimates. After exploring the posterior distributions of different parameter assumption scenarios, we conclude that a conservative estimate of the Galaxy's mass within 125kpc is 5.22x10^11^M_{sun}_, with a 50% probability region of (4.79,5.63)x10^11^M_{sun}_. Extrapolating out to the virial radius, we obtain a virial mass for the MW of 6.82x10^11^M_{sun}_ with 50% credible region of (6.06,7.53)x10^11^M_{sun}_ (r_vir_=185_-7_^+7^kpc). If we consider only the GCs beyond 10 kpc, then the virial mass is 9.02(5.69,10.86)x10^11^M_{sun}_ (r_vir_=198_-24_^+19^kpc). We also arrive at an estimate of the velocity anisotropy parameter {beta} of the GC population, which is {beta}=0.28 with a 50% credible region (0.21, 0.35). Interestingly, the mass estimates are sensitive to both the dark matter halo potential and visible matter tracer parameters, but are not very sensitive to the anisotropy parameter.

Keywords
  1. globular-star-clusters
  2. milky-way-galaxy
  3. proper-motions
Bibliographic source Bibcode
2016ApJ...829..108E
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/829/108
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/829/108
Document Object Identifer DOI
doi:10.26093/cds/vizier.18290108

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/829/108
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/829/108
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/829/108
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/829/108/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/829/108/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/829/108/table1?

History

2017-01-19T07:15:18Z
Resource record created
2017-01-19T07:15:18Z
Created
2018-01-05T08:55:30Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr