Results 31 to 40 of about 2,610 (79)

Modified gravity models and the central cusp of dark matter haloes in galaxies [PDF]

, 2014
The N-body dark matter (DM) simulations point that DM density profiles, e.g. the Navarro Frenk White (NFW) halo, should be cuspy in its centre, but observations disfavour this kind of DM profile.
de Oliveira, Paulo L, Fabris, Júlio C, Gentile, Gianfranco, Rodrigues, Davi C   +3 more
core   +2 more sources

Flat-Cored Dark Matter in Cuspy Clusters of Galaxies

, 2003
Sand, Treu, & Ellis (2002) have measured the central density profile of cluster MS2137-23 with gravitational lensing and velocity dispersion and removed the stellar contribution with a reasonable M/L.
Amr A. El-Zant, Brunzendorf J., Francoise Combes, Isaac Shlosman, Joel Primack, Yehuda Hoffman   +5 more
core   +4 more sources

The dependence of dark matter profiles on the stellar-to-halo mass ratio: a prediction for cusps versus cores [PDF]

, 2013
We use a suite of 31 simulated galaxies drawn from the MaGICC project to investigate the effects of baryonic feedback on the density profiles of dark matter haloes. The sample covers a wide mass range: 9.4×109
Aaron A. Dutton, Alexander Knebe, Andrea V. Macciò, Arianna Di Cintio, Avila-Reese, Blumenthal, Blumenthal, Bode, Borriello, Brook, Chabrier, Chris B. Brook, Cole, Courteau, de Blok, de Blok, Donato, Dutton, Dutton, Dutton, Einasto, El-Zant, Freyer, Gill, Gnedin, Goerdt, Governato, Governato, Graham, Greg S. Stinson, Hinshaw, James Wadsley, Kannan, Katz, Kay, Kennicutt, Knebe, Knebe, Knollmann, Komatsu, Kroupa, Kuhlen, Kuzio de Naray, Kuzio de Naray, Macciò, Macciò, Macciò, Martinsson, Mashchenko, McGaugh, Mo, Moster, Munshi, Navarro, Navarro, Navarro, Oh, Peñarrubia, Planck Collaboration, Pontzen, Power, Power, Read, Riess, Romano-Díaz, Salucci, Shen, Simon, Spergel, Springel, Springel, Stinson, Stinson, Stinson, Stinson, Swaters, Teyssier, Tonini, Torres, Wadsley, Wadsley, White   +81 more
core   +2 more sources

Rotation curve fitting and its fatal attraction to cores in realistically simulated galaxy observations

, 2016
We study the role of systematic effects in observational studies of the cusp-core problem under the minimum disc approximation using a suite of high-resolution (25-pc softening length) hydrodynamical simulations of dwarf galaxies.
de Oliveira, Claudia Mendes, Hayward, Christopher C., Pineda, Juan C. B., Springel, Volker   +3 more
core   +1 more source

Determination of the Local Dark Matter Density in our Galaxy

, 2009
The rotation curve, the total mass and the gravitational potential of the Galaxy are sensitive measurements of the dark matter halo profile. In this publication cuspy and cored DM halo profiles are analysed with respect to recent astronomical constraints
de Boer, Wim, Weber, Markus
core   +2 more sources

Chandrasekhar's Dynamical Friction and non-extensive statistics

, 2016
The motion of a point like object of mass $M$ passing through the background potential of massive collisionless particles ($m
de Souza, R. E., Del Popolo, A., Delliou, Morgan Le, Lee, Xi-Guo, Lima, J. A. S., Silva, J. M.   +5 more
core   +1 more source

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

The real and apparent convergence of N-body simulations of the dark matter structures: is the Navarro-Frenk-White profile real?

, 2014
We consider the reasons why a cuspy NFW-like profile persistently occurs in N-body simulations, in contradiction to some astronomical observations. The routine method of testing the convergence of N-body simulations (in particular, the negligibility of ...
Baushev, Anton N.
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

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