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New Theory Turns Back Clock on Conditions Behind Universe's Origin
Turns Back Clock Universe's Origin
2016/2/22
In a new study, scientists from The University of Texas at Dallas and their colleagues suggest a novel way for probing the beginning of space and time, potentially revealing secrets about the conditio...
The Origin of the Dust Arch in the Halo of NGC 4631: An Expanding Superbubble?
NGC 4631 galaxies
2014/12/24
We study the nature and the origin of the dust arch in the halo of the edge-on galaxy NGC 4631 detected by Neininger & Dumke. We present CO observations made using the new on-the-fly mapping mode with...
We show that a Magellanic Cloud origin for the warp of the Milky Way can explain most quantitative features of the outer H I layer recently identified by Levine et al. We construct a model, similar to...
On the origin of cold dark matter halo density profiles
dark matter large-scale structure of the universe
2014/12/24
N-body simulations predict that cold dark matter (CDM) halo-assembly occurs in two phases: (i) a fast-accretion phase with a rapidly deepening potential well; and (ii) a slow-accretion phase character...
Gamma Ray Burst origin and their afterglow: story of a discovery and more
Burst origin afterglow: story discovery more
2011/9/29
In this paper we review the story of the BeppoSAX discovery of the Gamma Ray Burst afterglow and their cosmological distance, starting from their first detection with Vela satellites and from the effo...
Nucleosynthesis origin of PG 1159 stars, Sakurai's object and of rare subclasses of presolar grains
Nucleosynthesis subclasses presolar grains
2011/9/27
We discuss theoretical AGB predictions for hydrogen-deficient PG 1159 stars and Sakurai's object, which show peculiar enhancements in He, C and O, and how these enhancements may be understood in the f...
We have imaged a region of ∼5 extent surrounding Sgr A∗
in the HI 21 cm-line absorption using the Very Large Array. A Gaussian
decomposition of the optical depth spectra at positions wi...
The Fate of Dwarf Galaxies in Clusters and the Origin of Intracluster Stars
Cosmology—galaxies clusters dwarfs interactions—methods numerical
2010/9/15
The main goal of this paper is to compare the relative importance of destruction by tides vs. destruction by mergers, in order to assess if tidal destruction of galaxies in clusters is a viable scenar...