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On ghosts in theories of self-interacting massive spin-2 particles
ghosts theories self-interacting massive spin-2 particles
2011/10/17
We consider general theories of a massive spin-2 particle $h_{\mu\nu}$ on a Minkowski background. A decomposition of $h_{\mu\nu}$ in terms of helicity eigenstates allows us to directly test whether an...
The Role of Stochastic Re-acceleration in the Prompt Emission of Gamma-Ray Bursts: Application to Hadronic Injection
Stochastic Re-acceleration Prompt Emission Gamma-Ray Bursts: Application Hadronic Injection
2011/10/20
We study effects of particle re-acceleration in the post-shock region via magnetohydrodynamic/plasma turbulence, in the context of a mixed hadronic-leptonic model for the prompt emission of gamma-ray ...
Clipping the Cosmos: The Bias and Bispectrum of Large Scale Structure
Bias Bispectrum Large Scale Structure
2011/10/21
A large fraction of the information collected by cosmological surveys is simply discarded to avoid lengthscales which are difficult to model theoretically. We introduce a new technique which enables t...
The propagation of relativistic jets in external media
propagation relativistic jets external media
2011/9/29
Relativistic jets are ubiquitous in astrophysical systems that contain compact objects. They transport large amounts of energy to large distances from the source, and their interaction with the ambien...
A Detailed Study of the Molecular and Atomic Gas Toward the γ-ray SNR RX J1713.7-3946: Spatial TeV γ-ray and ISM Gas Correspondence
McClure-Griffi ths G. Rowel T. Inoue S. Inutsuka A. Kawamura
2011/9/27
RX J1713.7-3946 is the most remarkable TeV {\gamma}-ray SNR which emits {\gamma}-rays in the highest energy range 10-100 TeV. We made a combined analysis of CO and HI in the SNR and derived the total ...
3C390.3: More Stable Evidence for Origination of Double-Peaked Broad Balmer Lines from Accretion Disk Near Central Black Hole
Galaxies:Active – Galaxies:nuclei – Galaxies:Seyfert – quasars:Emission lines – Galaxies:individual: 3C390.3
2011/9/27
In this manuscript, the structure of broad emission line regions (BLRs) of well-mapping double-peaked emitter (AGN with broad double-peaked low-ionization emission lines) 3C390.3 is studied. Besides t...
The OH Masers Towards IRAS 19092+0841
stars:formation masers ISM: individual: IRAS 19092 + 0841
2011/9/27
We present high angular resolution spectral line observations of ground state OH maser emission towards the young high mass proto-stellar object IRAS 19092+0841. The two OH main spectral lines, 1665 a...
日冕是太阳的外层大气, 其高温等离子体外流而形成太阳风, 又发射很强的紫外和X射线辐射, 日冕活动严重地影响日地空间环境. 日冕结构与太阳活动有密切联系. 2009年7月22日发生21世纪最壮观的日全食, 是观测研究日冕的良机, 但由于全食带地区大多阴雨而受挫, 幸好在个别天气好的地方可拍摄到高质量的日冕数码像. 本文选取其中部分像, 进行数字图像处理, 结合SOHO卫星LASCO C2所观测的当...
Radiation effects and shielding requirements in human missions to the moon and Mars
radiation remains Mars human missions moon
2009/6/1
Protection from radiation remains a concern for lunar human missions and a major hurdle for Mars human missions. Quantitative estimates are provided.
Detection, Excision and Statistics of Interference at the Mauritius Radio Telescope
Metre-wave radio telescope Fourier synthesis interference excision
2009/5/20
A technique to detect man-made interference in the visibility
data of the Mauritius Radio Telescope (MRT) has been developed. This
technique is based on the understanding that the interference is ge...
ELECTRON ENERGY-LOSS SPECTROSCOPY OF AUTOIONIZING STATES OF ZINC
Atomic processes - Scattering - Line profiles
2009/3/5
Autoionizing energy-loss spectra of Zn from 10.8 to 12.5 eV, for
incident electron energies between 20 and 100 eV, have been recorded at scattering
angles from 0 to 10. These spectra were decompos...