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The Cen A galaxy group: dynamical mass and missing baryons
Oliver Müller, Federico Lelli, Benoit Famaey +5
The nearby elliptical galaxy Cen A is surrounded by a flattened system of dwarf satellite galaxies with coherent motions. Using a novel Bayesian approach, we measure the mean rotat…
Testing the Strong Equivalence Principle. II. Relating the External Field Effect in Galaxy Rotation Curves to the Large-Scale Structure of the Universe
Kyu-Hyun Chae, Harry Desmond, Federico Lelli +2
Theories of modified gravity generically violate the strong equivalence principle, so that the internal dynamics of a self-gravitating system in free fall depends on the strength o…
The Baryonic Tully-Fisher Relation in the Local Group and the Equivalent Circular Velocity of Pressure Supported Dwarfs
Stacy McGaugh, Federico Lelli, Jim Schombert +4
We explore the Baryonic Tully-Fisher Relation in the Local Group. Rotationally supported Local Group galaxies adhere precisely to the relation defined by more distant galaxies. For…
WALLABY pre-pilot survey: Two dark clouds in the vicinity of NGC 1395
O. Ivy Wong, A. R. H. Stevens, B. -Q. For +34
We present the Australian Square Kilometre Array Pathfinder (ASKAP) WALLABY pre-pilot observations of two `dark' HI sources (with HI masses of a few times 10^8 Msol and no known st…
A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang
Federico Lelli, Enrico M. Di Teodoro, Filippo Fraternali +5
Cosmological models predict that galaxies forming in the early Universe experience a chaotic phase of gas accretion and star formation, followed by gas ejection due to feedback pro…
A cautionary tale in fitting galaxy rotation curves with Bayesian techniques: does Newton's constant vary from galaxy to galaxy?
Pengfei Li, Federico Lelli, Stacy McGaugh +2
The application of Bayesian techniques to astronomical data is generally non-trivial because the fitting parameters can be strongly degenerated and the formal uncertainties are the…