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Constraining the Projected Radial Distribution of Galactic Satellites with the Sloan Digital Sky Survey
Jacqueline Chen, Andrey V. Kravtsov, Francisco Prada +5
We use the Sloan Digital Sky Survey (SDSS) spectroscopic sample to constrain the projected radial distribution of satellites around isolated ~ L* galaxies. We employ mock galaxy ca…
Is there Evidence for Flat Cores in the Halos of Dwarf Galaxies?: The Case of NGC 3109 and NGC 6822
Octavio Valenzuela, George Rhee, Anatoly Klypin +4
Two well studied dwarf galaxies -- NGC 3109 and NGC 6822 -- present some of the strongest observational support for a flat core at the center of galactic dark matter (DM) halos. We…
How far do they go? The outer structure of dark matter halos
F. Prada, A. A. Klypin, E. Simonneau +4
We study the density profiles of collapsed galaxy-size dark matter halos with masses 1e11-5e12 Msun focusing mostly on the halo outer regions from the formal virial radius Rvir up…
Statistics of Voids in the 2dF Galaxy Redshift Survey
Santiago G. Patiri, Juan Betancort-Rijo, Francisco Prada +2
We present a statistical analysis of voids in the 2dF galaxy redshift survey (2dFGRS). In order to detect the voids, we have developed two robust algorithms. We define voids as non…
Bars and Cold Dark Matter Halos
P. Colin, O. Valenzuela, A. Klypin
The central part of a dark matter halo reacts to the presence and evolution of a bar. Not only does the halo absorb angular momentum from the disk, it can also be compressed and ha…
The role of resonances in barred galaxies
Daniel Ceverino, Anatoly Klypin
The dynamics of the inner disk of many galaxies is dominated by bars. As a result, resonances between the bar and the disk become an important factor. In order to detect resonances…
Tracing the Nature of Dark Energy with Galaxy Distribution
P. Solevi, R. Mainini, S. A. Bonometto +3
Dynamical Dark Energy (DE) is a viable alternative to the cosmological constant. Yet, constructing tests to discriminate between Lambda and dynamical DE models is difficult because…