The Kinematics of the Outer Halo of M87

Details The Kinematics of the Outer Halo of M87 The Kinematics of the Outer Halo of M87

1999-09-28

arxiv.org/abs/astro-ph/9909471v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the AJ. 13 pages with 3 figures

Scientific paper

10.1086/301184

Radial velocities are presented for a new sample of globular clusters in the outer halo of M87 at a distance of 300 to 540 arcsec (24 to 43 kpc) from the center of this galaxy. These are used to augment our previously published data and an analysis of the rotation and velocity dispersion of the M87 globular cluster system is carried out. The rotation is $\sim300$ \kms at R = 32 kpc, at which point the velocity dispersion is also still quite high, $\sim450$ \kms. The high rotation is interesting. The outer halo of M87 is, as was found in our previous kinematic analysis, very massive.

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