SIMBAD references

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 reference in ADS

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


2019.10.16-07:56:00

© Université de Strasbourg/CNRS

    • Contact