Thursday, November 18, 2010
Modelling MSXP Disk
The authors present a model of a radiation pressure dominated accretion disk around a millisecond x-ray pulsar including the interaction of the stellar magnetic field with the disk.
[277] arXiv:1011.2621 [pdf, ps, other]
Mount Ararat
Two astronomer-mountainers obtained permission to climb Mt Ararat in 2004. They took a rarely travelled route and discovered a much of interesting things including a possible meteor crater and an ancient fortress.
arXiv:1011.3715 [pdf] A meteorite crater on Mt. Ararat? V.G.Gurzadyan, S.Aarseth
Fermionic Molecular Dynamics
The authors present a technique better to account for the antisymmetry of fermionic wavefunctions in molecular dynamic simulations.
arXiv:1011.2928 (cross-list from nucl-th) [pdf, other] Title: Towards a quantal dynamical simulation of the neutron-star crust Authors: Klaas Vantournhout, Thomas Neff, Hans Feldmeier, Natalie Jachowicz,Jan Ryckebusch
SGR Bursts from Kes 73
Yet another AXP is found to emit gamma-ray bursts further cementing the common heritage of AXPs and SGRs.
arXiv:1011.3537 [pdf, ps, other] Title: SWIFT study of the first SGR-like burst from AXP 1E 1841-045 in SNR Kes 73
Thursday, November 4, 2010
Faraday Rotation
Whenever I see papers about asymmetries in Faraday rotation or other polarization stuff, I am reminded of a bunch of wacky papers from about five to ten years ago about quasar polarizations. This paper on the other hand argues that the observed Faraday rotation correlations come not from extra physics nor the Galactic magnetic field but from a nearby bubble of HI about 100 pc away toward the Galactic center. The bubble supposedly has compressed the magnetic field on either side of it, increasing its strength and therefore the Faraday rotation. These observations were performed at DRAO in Penticton in the beautiful Okanagan valley of BC.
arXiv:1011.0341 [pdf, ps, other]
Title: Antisymmetry in the Faraday Rotation Sky Caused by a Nearby Magnetized Bubble Authors: M. Wolleben, A. Fletcher, T. L. Landecker, E. Carretti, J. M. Dickey, B. M. Gaensler, M. Haverkorn, N. McClure-Griffiths, W. Reich, A. R. Taylor Comments: Published in Astrophysical Journal Letters 724 (2010) L48-L52 Subjects: Galaxy Astrophysics (astro-ph.GA)
Supernova Progenitors
As of 2010 over thirty core-collapse SN progenitors have been identified. What do they look like? Generally they are all massive stars (a plus for SN theory); furthermore Type II-P supernova typically have progenitors that are red supergiants at the low-mass end. The question is whether all massive stars result in SN. Kochanek has suggested we look for massive stars vanishing from nearby galaxies. This might be quite feasible and interesting.
arXiv:1011.0203 [pdf, ps, other]
Title: On the Progenitors of Core-Collapse Supernovae Authors: Douglas C. Leonard (San Diego State University) Comments: 7 Pages, invited review accepted for publication by Astrophysics and Space Science (special HEDLA 2010 issue) Subjects: Solar and Stellar Astrophysics (astro-ph.SR); Cosmology and Extragalactic Astrophysics (astro-ph.CO)
No Gamma-Rays from Magnetars
Fermi has looked for gamma-rays from magnetars from 100 MeV to 10 GeV and found none. This eliminates (or makes things really difficult) for some models of the hard x-ray emission from magnetars such as mine ( http://lanl.arxiv.org/pdf/astro-ph/0502349 ). Nothing ventured, nothing gained.
arXiv:1011.0091 [pdf, other]
Title: Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope Authors: The Fermi-LAT collaboration Comments: ApJ Letters in press; Corresponding authors: Caliandro G. A., Hadasch D., Rea N., Burnett T Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Galaxy Astrophysics (astro-ph.GA)
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