Aims. A test of Newton's law of gravity in the low acceleration regime using globular clusters is presented and new results for the core collapsed globular cluster NGC 7099 given. Methods. The run of the gravitational potential as a function of distance is probed by studying the velocity dispersion profile of the cluster, as derived from a set of 125 radial velocities with accuracy better than ...

We study the evolution of globular clusters with mass spectra under the influence of the steady Galactic tidal field, including the effects of velocity anisotropy. Similar to single-mass models, velocity anisotropy develops as the cluster evolves, but the degree of anisotropy is much smaller than isolated clusters. Except for very early epochs of the cluster evolution, nearly all mass component...

We present new high spatial resolution HST/ACS imaging of NGC 1140 and high spectral resolution VLT/UVES spectroscopy of its central star-forming region. The central region contains several clusters, the two brightest of which are clusters 1 and 6 from Hunter, O’Connell & Gallagher, located within star-forming knots A and B, respectively. Nebular analysis indicates that the knots have an LMC-li...

We report on the local environment, radial velocity, and star formation history of [O II]-selected emissionline objects in the z ≈ 0.4 galaxy cluster Abell 851, using optical spectra obtained with Keck I/LRIS and Keck II/DEIMOS. A large fraction (≈ 55%) of cluster [O II] emitters show strong Balmer absorption lines (& 4 Å in equivalent width at Hδ). These e(a)-type spectra have been attributed ...