搜索结果: 1-15 共查到“恒星与银河系 dark matter”相关记录15条 . 查询时间(0.144 秒)
Dark Matter distribution in the Milky Way: microlensing and dynamical constraints
Dark Matter distribution Milky Way microlensing dynamical constraints
2011/10/20
We show that current microlensing and dynamical observations of the Galaxy allow to set interesting constraints on the Dark Matter local density and profile slope towards the galactic centre. Assuming...
Pairwise Velocities of Dark Matter Halos: a Test for the Lambda Cold Dark Matter Model using the Bullet Cluster
method : N-body simulations — galaxies : evolution — galaxies : for-mation — galaxies: clusters — cosmology : theory — cosmology : dark matter
2011/10/13
The existence of a bullet cluster (such as 1E0657-56) poses a challenge to the concordance Lambda cold dark matter model. Here we investigate the velocity distribution of dark matter halo pairs in lar...
Too small to succeed? Lighting up massive dark matter subhaloes of the Milky Way
methods: numerical - N-body simulations – galaxies: formation - haloes - Local Group
2011/10/19
Using Constrained Local UniversE Simulations (CLUES) of the formation of the Local Group in a cosmological context we investigate the recently highlighted problem that the majority of the most massive...
The outer haloes of the Milky Way and Andromeda galaxies contain as much important information on their assembly and formation history as the properties of the discs resident in their centres. In this...
'Best evidence yet' for dark matter comes from Milky Way centre（图）
dark matter Milky Way centre
2010/12/1
Energetic radiation pulsing from the belly of the Milky Way is the clearest signal yet of dark matter. That is according to a pair of astrophysicists in the US who reach this conclusion after scrutini...
We revisit ghost dark matter, the possibility that ghost condensation may serve as an alternative to dark matter. In particular, we investigate the Friedmann-Robertson-Walker (FRW) background evolutio...
Alternatives to dark matter: Modified gravity as an alternative to dark matter
dark matter Modified gravity
2010/3/19
The premier alternative to the dark matter paradigm is modified gravity. Following an introduction to the relevant phenomenology of galaxies, I review the MOND paradigm, an effective summary of the ob...
Luke-warm dark matter: Bose-condensation of ultra-light particles
Luke-warm dark matter ultra-light particles
2010/3/18
We discuss the thermal evolution and Bose condensation of ultra-light scalar particles with Compton wavelength of galactic scales. We find an upper bound of 1.5 K for the dark matter temperature from ...
Flat central density profiles from scalar field dark matter halos
density profiles scalar field dark matter halos
2009/7/10
Flat central density profiles from scalar field dark matter halos。
Low mass dark matter halos in voids。
The structure of halos in Self-Interacting Cold Dark Matter models
halos Self-Interacting Cold Dark Matter models
2009/6/11
The structure of halos in Self-Interacting Cold Dark Matter models。
Dark Matter in late-type galaxies。
Assuming that the disc of our Galaxy, the Milky Way, obeys the
classical exponential law, that it is maximal and the Sun is rather far from the
maximum of its circular velocity, one ¯nds that, ...
16 May 2007，A ring-shaped distribution of mass in a galaxy cluster five billion light-years from Earth is the strongest evidence yet for the existence of dark matter. This is the claim of physicists f...
Using X-ray observation we have obtained the deprojected gas density and temperature profiles for a sample of cluster of galaxies. We show that cool-core clusters, which are expected to be the largest...