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Astropy: A community Python package for astronomy
- T. P. Robitaille, E. Tollerud, O. Streicher
- Physics
- 23 July 2013
We present the first public version (v0.2) of the open-source and community-developed Python package, Astropy. This package provides core astronomy-related functionality to the community, including…
How supernova feedback turns dark matter cusps into cores
- A. Pontzen, Fabio Governato Kavli Institute for Cosmology, Cambridge, U. Washington, Seattle
- Physics
- 2 June 2011
We propose and successfully test against new cosmological simulations a novel analytical description of the physical processes associated with the origin of cored dark matter density profiles. In the…
Damped Lyman α systems in galaxy formation simulations
- A. Pontzen, F. Governato, M. Haehnelt
- Physics
- 29 April 2008
We investigate the population of z = 3 damped Lyman alpha systems (DLAs) in a recent series of high resolution galaxy formation simulations. The simulations are of interest because they form at z = 0…
Cuspy No More: How Outflows Affect the Central Dark Matter and Baryon Distribution in Lambda CDM Galaxies
- F. Governato, A. Zolotov, M. Univ.
- Physics
- 2 February 2012
We examine the evolution of the inner dark matter (DM) and baryonic density profile of a new sample of simulated field galaxies using fully cosmological, Lambda CDM, high resolution SPH + N-Body…
THE COUPLING BETWEEN THE CORE/CUSP AND MISSING SATELLITE PROBLEMS
- J. Peñarrubia, A. Pontzen, M. Walker, Sergey E. Koposov
- Physics
- 11 July 2012
We calculate the energy that baryons must inject into cold dark matter (CDM) halos in order to remove centrally divergent DM cusps on scales relevant to observations of dwarf spheroidal galaxies…
BARYONS MATTER: WHY LUMINOUS SATELLITE GALAXIES HAVE REDUCED CENTRAL MASSES
- A. Zolotov, A. Brooks, J. Wadsley
- Physics
- 29 June 2012
Using high-resolution cosmological hydrodynamical simulations of Milky Way-massed disk galaxies, we demonstrate that supernovae feedback and tidal stripping lower the central masses of bright (−15 <…
Cusp-core transformations in dwarf galaxies: observational predictions
- R. Teyssier, A. Pontzen, Y. Dubois, J. Read
- Physics
- 21 June 2012
The presence of a dark matter core in the central kiloparsec of many dwarf galaxies has been a long standing problem in galaxy formation theories based on the standard cold dark matter paradigm.…
IN-N-OUT: THE GAS CYCLE FROM DWARFS TO SPIRAL GALAXIES
- C. Christensen, R. Dav'e, J. Wadsley
- Physics
- 31 July 2015
We examine the scalings of galactic outflows with halo mass across a suite of 20 high-resolution cosmological zoom galaxy simulations covering halo masses in the range . These simulations…
Hierarchical formation of bulgeless galaxies: why outflows have low angular momentum
- C. Brook, F. Governato, A. Pontzen
- Physics
- 5 October 2010
Using high resolution, fully cosmological smoothed particle hydrodynamical simulations of dwarf galaxies in a Lambda cold dark matter Universe, we show how high redshift gas outflows can modify the…
Dynamical friction in constant density cores: a failure of the Chandrasekhar formula
- J. Read, T. Goerdt, B. Moore, A. Pontzen, J. S. Lake
- Physics
- 26 June 2006
Using analytic calculations and N-body simulations we show that in constant density (harmonic) cores, sinking satellites undergo an initial phase of very rapid (super-Chandrasekhar) dynamical…
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