منابع مشابه
Inside-out Galaxy Formation
Current theories of galaxy formation have tended to focus on hierarchical structure formation, which is the most likely scenario for cosmological models with lots of power at small scales (e.g. standard cold dark matter). Models with little small scale power lead to scenarios closer to spherical collapse. Recently favored power spectra (e.g. CDM+Λ) lie somewhere in between suggesting that both ...
متن کاملThe Mass Profile of Galaxy Clusters out to ∼
We use the public release of ≃ 100, 000 galaxies of the Two Degree Field Galaxy Redshift Survey (2dFGRS) to analyze the internal dynamics of galaxy clusters. We select 43 non-interacting clusters which are adequately sampled in the 2dFGRS public release. Members of these clusters are selected out to ∼ 2 virial radii. We build an ensemble cluster by stacking together the 43 clusters, after appro...
متن کاملThree-Body Kick to a Bright Quasar out of Its Galaxy During a Merger
The quasar HE0450-2958 was recently discovered to reside ∼ 7 kpc away from a galaxy that was likely disturbed by a recent merger. The lack of a massive spheroid of stars around the quasar raised the unlikely suggestion that it may have formed in a dark galaxy. Here we explain this discovery as a natural consequence of a dynamical kick imparted to the quasar as it interacted with a binary black ...
متن کاملParallel Computations Allow Cosmologists to Rule Out a Theory of Galaxy Formation
Cosmic defect models ooer a interesting alternative to the standard \innationary" models of cosmic stucture formation. Here, we calculate predictions from defect models of structure formation for both the matter and Cosmic Microwave Background (CMB) over all observable scales. Our results point to a serious problem reconciling the observed large-scale galaxy distribution with the COBE normaliza...
متن کاملThe debts' clearing problem: a new approach
The debts’ clearing problem is about clearing all the debts in a group of n entities (e.g. persons, companies) using a minimal number of money transaction operations. In our previous works we studied the problem, gave a dynamic programming solution solving it and proved that it is NP-hard. In this paper we adapt the problem to dynamic graphs and give a data structure to solve it. Based on this ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 2041-8205,2041-8213
DOI: 10.1088/2041-8205/745/2/l34