NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-22 T18:12:31 PDT
Help | Comment | NED Home

For refcode 2014ApJ...793...63W:
Retrieve 41 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2014ApJ...793...63W The Kinematical Center and Mass Profile of the Local Group Whiting, Alan B. Abstract. Abandoning the assumption that light traces mass, I seek the location of the center of the Local Group of galaxies based solely on kinematic data and the plausible assumption of infall. The available set of positions and radial velocities is shown to be a misleading indicator of Local Group motions, giving a direction to the center offset from the true one; statistical techniques of moderate sophistication do not catch the offset. Corrected calculations show the center to lie in the direction of M31 within the uncertainty of the method, within a few degrees. The distance to the center is not well determined, lying about 0.5 Mpc from the Milky Way. The pattern of observed (galactocentric) radial velocities excludes both dynamically important "orphan halos" and any extended dark matter halo for the Group as a whole, and shows the Group to have formed from a much more extended volume than it presently occupies. Kinematics alone indicates that the mass of the Group is concentrated effectively in M31 and the Milky Way. Key words: dark matter, galaxies: kinematics and dynamics, Local Group
Retrieve 41 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home