Author: Philip F. Hopkins
Link to paper: http://arxiv.org/abs/1101.4230
The author investigates the observed (possible) delay between the onset of AGN activity and the peak of star formation in star-burst galaxies. He shows that the delay can be reproduced in simulations of merging galaxies, and give a physical explanation of it. He argues of implications for the role of the AGN feedback in suppressing star formation.
27 January 2011
On Lyman-limit Systems
On Lyman-limit Systems and the Evolution of the Intergalactic Ionizing Background
Authors: Matthew McQuinn, S. Peng Oh, Claude-Andre Faucher-Giguere
http://arxiv.org/abs/1101.1964v1
The authors use cosmological simulations to study the properties of Lyman-limit systems at 3 < z < 6 and the relation between the ionising emissivity of galaxies and the amplitude of the intergalactic ionising background. This could explain the rapid decrease in the Ly-alpha forest transmission observed around z=6 without invoking reionisation.
Authors: Matthew McQuinn, S. Peng Oh, Claude-Andre Faucher-Giguere
http://arxiv.org/abs/1101.1964v1
The authors use cosmological simulations to study the properties of Lyman-limit systems at 3 < z < 6 and the relation between the ionising emissivity of galaxies and the amplitude of the intergalactic ionising background. This could explain the rapid decrease in the Ly-alpha forest transmission observed around z=6 without invoking reionisation.
19 January 2011
Conformal Cyclic Cosmology in WMAP data?
Authors: V.G.Gurzadyan, R.Penrose
Link to Paper: arxiv.org/abs/1011.3706
The Conformal Cyclic Cosmology model. A dynamic and controversial model (R. Penrose) that argues for various aeons preceding and following our current universe. The authors also explain that the validity of this model can be tested via observations (CMB anisotropies) and even claim to have found proof for the same!
Link to Paper: arxiv.org/abs/1011.3706
The Conformal Cyclic Cosmology model. A dynamic and controversial model (R. Penrose) that argues for various aeons preceding and following our current universe. The authors also explain that the validity of this model can be tested via observations (CMB anisotropies) and even claim to have found proof for the same!
An Actively Accreting Massive Black Hole in the Dwarf Starburst Galaxy Henize 2-10
Authors: Reines et al.
Link to the paper: arXiv:1101.1309
The authors report observations strongly suggesting the presence of a central black hole in a blue compact dwarf galaxy. The mass of the black hole is estimated to be ~10^6 MSun, which is intriguing given that the galaxy itself has no bulge, nucleus, or nuclear stellar cluster. In turn, the authors suggest that in the early universe black holes may have formed before the stellar components of the first dwarf galaxies.
Link to the paper: arXiv:1101.1309
The authors report observations strongly suggesting the presence of a central black hole in a blue compact dwarf galaxy. The mass of the black hole is estimated to be ~10^6 MSun, which is intriguing given that the galaxy itself has no bulge, nucleus, or nuclear stellar cluster. In turn, the authors suggest that in the early universe black holes may have formed before the stellar components of the first dwarf galaxies.
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