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Velocity Dispersion Profile of the Milky Way Halo
Warren R. Brown, Margaret J. Geller, Scott J. Kenyon +1
We present a spectroscopic sample of 910 distant halo stars from the Hypervelocity Star survey from which we derive the velocity dispersion profile of the Milky Way halo. The sampl…
Constraining f(R) theories with Type Ia Supernovae and Gamma Ray Bursts
Vincenzo F. Cardone, Antonaldo Diaferio, Stefano Camera
Fourth - order gravity theories have received much interest in recent years thanks to their ability to provide an accelerated cosmic expansion in a matter only universe. In these t…
Implications for dwarf spheroidal mass content from interloper removal
Ana Laura Serra, Garry W. Angus, Antonaldo Diaferio
Using the caustic method, we identify the member stars of five dwarf spheroidal (dSph) galaxies of the Milky Way, the smallest dark matter (DM) dominated systems in the Universe. A…
Equilibrium configurations of 11eV sterile neutrinos in MONDian galaxy clusters
Garry W. Angus, Benoit Famaey, Antonaldo Diaferio
(Abridged) Modified Newtonian Dynamics (MOND) can fit a broad range of galaxy kinematic data, but struggles with clusters of galaxies. MONDian clusters need dark matter, and here w…
Resolving the timing problem of the globular clusters orbiting the Fornax dwarf galaxy
Garry W. Angus, Antonaldo Diaferio
We re-investigate the old problem of the survival of the five globular clusters orbiting the Fornax dwarf galaxy in both standard and modified Newtonian dynamics. For the first tim…
Weak lensing signal in Unified Dark Matter models
Stefano Camera, Daniele Bertacca, Antonaldo Diaferio +2
Weak gravitational lensing is a powerful tool for studying both the geometry and the dynamics of the Universe. Its power spectrum contains information on the sources emitting photo…