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The Timeless Timing Argument and the Mass of the Local Group
Till Sawala, Jorge Peñarrubia, Shihong Liao +1
The Timing Argument connects the motion of a two-body system to its mass in an expanding Universe with a finite age, under the assumption that it has evolved on a self-gravitating…
Unbiased constraints on ultralight axion mass from dwarf spheroidal galaxies
Alma X. Gonzalez-Morales, David J. E. Marsh, Jorge Peñarrubia +1
It has been suggested that the internal dynamics of dwarf spheroidal galaxies (dSphs) can be used to test whether or not ultralight axions with are a pr…
How chameleons core dwarfs with cusps
Lucas Lombriser, Jorge Peñarrubia
The presence of a scalar field that couples nonminimally and universally to matter can enhance gravitational forces on cosmological scales while restoring general relativity in the…
The masses of Local Group dwarf spheroidal galaxies: The death of the universal mass profile
Michelle L. M. Collins, Scott C. Chapman, R. M. Rich +12
We investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the Galaxy. By…
A kinematic study of the Andromeda dwarf spheroidal system
Michelle L. M. Collins, Scott C. Chapman, R. Michael Rich +12
We present a homogeneous kinematic analysis of red giant branch stars within 18 of the 28 Andromeda dwarf spheroidal (dSph) galaxies, obtained using the Keck I LRIS and Keck II DEI…
Herschel-ATLAS: a binary HyLIRG pinpointing a cluster of starbursting proto-ellipticals
R. J. Ivison, A. M. Swinbank, Ian Smail +48
Panchromatic observations of the best candidate HyLIRG from the widest Herschel extragalactic imaging survey have led to the discovery of at least four intrinsically luminous z=2.4…