Galaxy masses play a fundamental role in our understanding of structure formation models.
This review addresses the variety and reliability of mass estimators that pertain to stars, gas …

Most galaxies comparable to or larger than the mass of the Milky Way host hot, X-ray
emitting atmospheres, and many such galaxies are radio sources. Hot atmospheres and …

We present a systematic study of the density profiles of ΛCDM halos, focusing on the outer
regions, 0.1< r/R vir< 9. We show that the median and mean profiles of halo samples of a …

We present the stellar kinematics in the central 2''of the luminous elliptical galaxy M87 (NGC
4486), using laser adaptive optics to feed the Gemini telescope integral-field spectrograph …

We combine in a self-consistent way the constraints from both gravitational lensing and
stellar kinematics to perform a detailed investigation of the internal mass distribution, amount …

Current theories predict relativistic hadronic particle populations in clusters of galaxies in
addition to the already observed relativistic leptons. In these scenarios hadronic interactions …

ABSTRACT X-ray observations of clusters of galaxies reveal the presence of edges in
surface brightness and temperature, known as" cold fronts." In relaxed clusters with cool …

We present results from new Chandra, GMRT, and SOAR observations of NGC 5813, the
dominant central galaxy in a nearby galaxy group. The system shows three pairs of collinear …

Star formation in the universe's largest galaxies—the ones at the centers of galaxy clusters—
depends critically on the thermodynamic state of their hot gaseous atmospheres. Central …

The local expansion rate of the Universe is parametrized by the Hubble constant, H 0, the
ratio between recession velocity and distance. Different techniques lead to inconsistent …