Results 31 to 40 of about 2,700 (75)

Is there Evidence for Flat Cores in the Halos of Dwarf Galaxies?: The Case of NGC 3109 and NGC 6822

, 2005
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 use detailed cosmologically motivated numerical models to investigate the
Anatoly Klypin, Athanassoula E., Begeman K. G., de Blok W. J. G., Fabio Governato, George Rhee, Gottesman S. T., Gregory Stinson, Israel F. P., James Wadsley, Kahabka P., Klypin A., Octavio Valenzuela, Rowan-Robinson M., Schoenmakers R. H. M., Staveley-Smith L., Thomas Quinn   +16 more
core   +1 more source

Contraction of Dark Matter Halos in Response to Condensation of Baryons

, 2005
The cooling of baryons in the centers of dark matter halos leads to a more concentrated dark matter distribution. This effect has traditionally been calculated using the model of adiabatic contraction, which assumes spherical symmetry, while in ...
Gnedin, Oleg Y.
core   +1 more source

The role of dark matter in the galaxy mass-size relationship

, 2011
The observed relationship between stellar mass and effective radius for early type galaxies, pointed out by many authors, is interpreted in the context of Clausius' virial maximum theory.
Bernardi, Bernardi, Bertin, Bindoni, Binney, Binney, Brosche, Brosche, Burstein, Caimmi, Caimmi, Cappellari, Carollo, Chandrasekhar, Chiosi, D. Bindoni, Djorgovski, D’Onofrio, E. Contini, Faber, Jorgensen, King, Kormendy, L. Secco, Mamon, Marmo, Napolitano, Navarro, Nigoche-Netro, Pahre, Prugniel, Prugniel, R. Caimmi, Saglia, Secco, Secco, Shen, Spergel, Spergel, Tantalo, Tortora, von Hoerner, Zhao   +42 more
core   +1 more source

Contradiction between strong lensing statistics and a feedback solution to the cusp/core problem

, 2010
Standard cosmology has many successes on large scales, but faces some fundamental difficulties on small, galactic scales. One such difficulty is the cusp/core problem.
Barnes, Bartelmann, Begeman, Broadhurst, Chen, Chen, Chiba, Choi, Da-Ming Chen, de Blok, de Blok, Gnedin, Hennawi, Huterer, Jing, Jing, Kazantzidis, Komatsu, Kormendy, Kuzio de Naray, Kuzio de Naray, Li, Li, McGaugh, McGaugh, Navarro, Oguri, Oguri, Schneider, Sellwood, Stacy McGaugh, Zhang   +31 more
core   +1 more source

The Effect of a Single Supernova Explosion on the Cuspy Density Profile of a Small-Mass Dark Matter Halo

, 2011
Some observations of galaxies, and in particular dwarf galaxies, indicate a presence of cored density profiles in apparent contradiction with cusp profiles predicted by dark matter N-body simulations.
Abel, Alvarez, Binney, Burkert, Coccato, Cuddeford, de Blok, de Blok, de Blok, de Blok, de Souza, de Souza, Dehnen, Dekel, Donato, E. E. O. Ishida, Gnedin, Gnedin, Governato, Hensler, Jarosik, Kazantzidis, Kitayama, Kitayama, Kravtsov, Kuzio de Naray, L. F. S. Rodrigues, Mac Low, Mashchenko, Mashchenko, Moore, Mori, Mori, Mori, Murakami, Navarro, Navarro, Navarro, Ostriker, Pasetto, Pedrosa, Peñarrubia, R. Opher, R. S. de Souza, Read, Rindler-Daller, Rodrigues, Sakuma, Salucci, Tonini, Vasiliev, Whalen, Whalen, Wise, Zhao   +54 more
core   +1 more source

Effect of small scale density perturbations on the formation of dark matter halo profiles

, 2012
With help of a set of toy N-body models of dark halo formation we study the impact of small scale initial perturbations on the inner density profiles of haloes. We find a significant flattening of the inner slope $\alpha={d \log \rho \over d \log r}$ to $
A. G. Doroshkevich, Abdelqader, Antonov, Avila-Reese, Bagla, Bagla, Bekki, Binney, Boomsma, Burkert, Cen, Chandrasekhar, de Blok, de Blok, Doroshkevich, E. V. Mikheeva, Hayashi, Knebe, Knollmann, Lukash, Lynden-Bell, Ma, Medvedev, Mikheeva, Navarro, Navarro, Pilipenko, S. V. Pilipenko, Spergel, Springel, Springel, Tremaine, V. N. Lukash, Walker, Wyse, Zel’dovich   +35 more
core   +1 more source

Core-Cusp revisited and Dark Matter Phase Transition Constrained at O(0.1) eV with LSB Rotation Curve

, 2012
Recently a new particle physics model called Bound Dark Matter (BDM) has been proposed in which dark matter (DM) particles are massless above a threshold energy (Ec) and acquire mass below it due to nonperturbative methods.
Cervantes-Cota, Jorge L., de la Macorra, Axel, Mastache, Jorge   +2 more
core   +1 more source

Dark matter halo mass functions and density profiles from mass and energy cascade. [PDF]

Sci Rep, 2023
Xu ZJ.
europepmc   +1 more source

Investigating the long-term evolution of galaxies: Noise,cuspy halos and bars [PDF]

, 2001
I review the arguments for the importance of halo structure in driving galaxy evolution and coupling a galaxy to its environment. We begin with a general discussion of the key dynamics and examples of structure dominated by modes.
Weinberg, Martin D.
core   +2 more sources

Structure and Subhalo Population of Halos in a Self-Interacting Dark Matter Cosmology

, 2002
We study the structure of Milky Way (MW)- and cluster-sized halos in a Lambda Cold Dark Matter (CDM) cosmology with self-interacting (SI) dark particles.
Claudio Firmani, Corsini E. M., de Blok W. J. G., Lynden-Bell D., Octavio Valenzuela, Pedro Colin, Vladimir Avila‐Reese   +6 more
core   +3 more sources