Results 21 to 30 of about 2,610 (79)

The Cusp/Core problem: supernovae feedback versus the baryonic clumps and dynamical friction model

, 2016
In the present paper, we compare the predictions of two well known mechanisms considered able to solve the cusp/core problem (a. supernova feedback; b. baryonic clumps-DM interaction) by comparing their theoretical predictions to recent observations of ...
Del Popolo, A., Pace, F.
core   +1 more source

Deadly dark matter cusps vs faint and extended star clusters: Eridanus II and Andromeda XXV

, 2017
The recent detection of two faint and extended star clusters in the central regions of two Local Group dwarf galaxies, Eridanus II and Andromeda XXV, raises the question of whether clusters with such low densities can survive the tidal field of cold dark
Amorisco, Nicola C.
core   +1 more source

Re-examining the Too-Big-To-Fail Problem for Dark Matter Haloes with Central Density Cores [PDF]

, 2014
Recent studies found the densities of dark matter (DM) subhaloes which surround nearby dwarf spheroidal galaxies (dSphs) to be significantly lower than those of the most massive subhaloes expected around Milky Way sized galaxies in cosmological ...
Burkert, Andreas, Ogiya, Go
core   +1 more source

A unified solution to the small scale problems of the $\Lambda$CDM model II: introducing parent-satellite interaction

, 2014
We continue the study of the impact of baryon physics on the small scale problems of the $\Lambda$CDM model, based on a semi-analytical model (Del Popolo, 2009).
Del Popolo, Antonino, Delliou, Morgan Le
core   +2 more sources

On the bar formation mechanism in galaxies with cuspy bulges [PDF]

, 2016
We show by numerical simulations that a purely stellar dynamical model composed of an exponential disc, a cuspy bulge, and an NFW halo with parameters relevant to the Milky Way Galaxy is subject to bar formation.
Berczik, Peter, Just, Andreas, Polyachenko, Evgeny   +2 more
core   +2 more sources

Small scale problems of the $\Lambda$CDM model: a short review

, 2017
The $\Lambda$CDM model, or concordance cosmology, as it is often called, is a paradigm at its maturity. It is clearly able to describe the universe at large scale, even if some issues remain open, such as the cosmological constant problem , the small ...
Del Popolo, Antonino, Delliou, Morgan Le
core   +4 more sources

Cuspy No More: How Outflows Affect the Central Dark Matter and Baryon Distribution in Lambda CDM Galaxies

, 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 simulations.
A. M. Brooks, A. Pontzen, A. Zolotov, Abdo, Adams, Agertz, Ahn, Avila Reese, Barnes, Bell, Belokurov, Benson, Bigiel, Bode, Bower, Boylan-Kolchin, Brook, Brooks, Brooks, Bruzual, Bullock, C. Christensen, Ceverino, Chemin, Choi, Christensen, Colín, Conroy, Croft, Dalal, Dalcanton, Dalcanton, Davé, de Blok, de Blok, de Souza, Dekel, Dekel, Dekel, Del Popolo, Donato, Eke, El-Zant, Elmegreen, Elson, Evans, F. Governato, Fall, Feldmann, Flores, Font, Geha, Geha, Gentile, Gnedin, Gnedin, Goerdt, Goerdt, Governato, Governato, Governato, Guedes, Haardt, Hopkins, J. Wadsley, Katz, Kazantzidis, Kennicutt, Kereš, Kirby, Knebe, Knollmann, Koda, Koposov, Krumholz, Kuzio de Naray, Lackner, Li, Loeb, Lovell, Macciò, Macciò, Macciò, Martin, Martinez, Mashchenko, Mashchenko, Mayer, Mayer, McGaugh, McQuinn, Mo, Moore, Moore, Moster, Navarro, Navarro, Navarro, Oh, Oh, Oh, Oppenheimer, Parry, Peñarrubia, Pontzen, Pontzen, Pontzen, Primack, Quinn, Rashkov, Read, Reed, Riess, Romano-Díaz, S. H. Oh, S. Shen, Saitoh, Shapley, Shen, Simon, Simon, Spergel, Spergel, Springel, Stadel, Stinson, Stoehr, Strigari, Strigari, Stringer, Swaters, Swaters, Sánchez-Janssen, T. Quinn, Tollerud, Tollerud, Tonini, van den Bosch, van der Wel, Viel, Vogelsberger, Wadsley, Walker, Walker, Walter, Willman, Zhang, Zolotov   +147 more
core   +1 more source

Density Profiles of Cold Dark Matter Substructure: Implications for the Missing Satellites Problem

, 2004
The structural evolution of substructure in cold dark matter (CDM) models is investigated combining ``low-resolution'' satellites from cosmological N-body simulations of parent halos with N=10^7 particles with high-resolution individual subhalos orbiting
Ben Moore, Binney J., Chiara Mastropietro, Eke V. R., Fall S. M., Joachim Stadel, Jurg Diemand, Kauffmann G., Klypin A., Lucio Mayer, Stelios Kazantzidis   +10 more
core   +1 more source

Bars in Cuspy Dark Halos [PDF]

, 2008
We examine the bar instability in models with an exponential disk and a cuspy NFW-like dark matter (DM) halo inspired by cosmological simulations. Bar evolution is studied as a function of numerical resolution in a sequence of models spanning 10K to 100M
Ingo Berentzen, Isaac Shlosman, John Dubinski, Sellwood   +3 more
core   +1 more source

The Structural and Kinematic Evolution of Central Star Clusters in Dwarf Galaxies and Their Dependence on Dark Matter Halo Profiles

, 2018
Through a suite of direct N-body simulations, we explore how the structural and kinematic evolution of a star cluster located at the center of a dwarf galaxy is affected by the shape of its host's dark matter density profile.
Vesperini, Enrico, Webb, Jeremy J.
core   +1 more source