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中国科学院国家天文台研究人员成功模拟SNR在前身星星风中射电演化（图）
中国科学院国家天文台 研究人员 SNR 前身 星星风 射电演化
2018/11/27
超新星遗迹是超新星爆发后与周围介质相互作用产生的一类天体，研究超新星遗迹可以帮助我们理解超新星的前身星模型和爆发模型，限制星系元素丰度和尘埃模型，分析宇宙线加速机制。然而多年来，一个最基本的问题却一直处于模棱两可的状态，那就是超新星遗迹多样化的射电形态是如何演变而来的。经过长期的努力攻关，最近国家天文台天体物理综合研究团组科研人员综合考虑星际磁场、前身星的星风和自行对遗迹演化的影响，利用大型软件包...
VLA and XMM-Newton Observations of the SNR W41/TeV Gamma-Ray Source HESS J1834–087
W41 HESS
2014/12/23
The recently discovered extended TeV source HESS J1834-087 is associated with both a diffuse X-ray enhancement and a molecular cloud, projected at the center of an old radio supernova remnant, G23.3-0...
Radio and X-ray images of the SNR G18.8+0.3 interacting with molecular clouds
Radio X-ray images
2014/12/23
New HI images from the VLA Galactic Plane Survey (VGPS) show clear absorption features associated with the supernova remnant (SNR) G18.8+0.3. High-resolution 13CO images reveal that molecular clouds o...
X-Ray Timing Observations of PSR J1930+1852 in the Crab-like SNR G54.1+0.3
PSR J1930+1852 remnants
2014/12/23
We present new X-ray timing and spectral observations of PSR J1930+1852, the young energetic pulsar at the center of the nonthermal supernova remnant G54.1+0.3. Using data obtained with the Rossi X-Ra...
The mutual information of bit-interleaved coded modulation (BICM) systems, sometimes called the BICM capacity, is investigated at low signal-to-noise ratio (SNR), i.e., in the wideband regime. A new l...
PSR J0007+7303 in the CTA1 SNR: New Gamma-ray Results from Two Years of Fermi-LAT Observations
CTA1 SNR:Gamma-ray Results Fermi-LAT Observations
2011/10/12
One of the main results of the Fermi Gamma-Ray Space Telescope is the discovery of {\gamma}-ray selected pulsars. The high magnetic field pulsar, PSR J0007+7303 in CTA1, was the first ever to be disco...
Achieving a vanishing SNR-gap to exact lattice decoding at a subexponential complexity
SNR-gap subexponential complexity Information Theory
2011/9/15
Abstract: The work identifies the first lattice decoding solution that achieves, in the general outage-limited MIMO setting and in the high-rate and high-SNR limit, both a vanishing gap to the error-p...
HESS J1858+020 is a TeV gamma-ray source that was reported not to have any clear cataloged counterpart at any wavelength. However, it has been recently proposed that this source is indirectly associat...
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 ...
Two-Step Acceleration Model of Cosmic Rays at Middle-Aged SNR
High Energy Astrophysical Phenomena (astro-ph.HE
2010/12/24
Recent gamma-ray observations of middle-aged supernova remnants revealed a mysterious broken power-law spectrum. Using three-dimensional magnetohydrodynamics simulations, we show that the interaction ...
Finite-SNR Diversity-Multiplexing Tradeoff via Asymptotic Analysis of Large MIMO Systems
Diversity-multiplexing tradeoff outage probability
2010/12/9
Diversity–multiplexing tradeoff (DMT) was characterized asymptotically (SNR-> infinity) for i.i.d. Rayleigh fading channel by Zheng and Tse [1].
MULTIFREQUENCY OBSERVATIONS OF ONE OF THE LARGEST SUPERNOVA REMNANTS IN THE LOCAL GROUP OF GALAXIES, LMC - SNR J0450-709
ISM: supernova remnants Magellanic Clouds Radio Continuum:ISM Polarisation ISM: individual objects : SNR J0450-709
2010/10/29
We present the results of new Australia Telescope Compact Array (ATCA) observations of one of the largest supernova remnants, SNR J0450{709, in the Local Group of galaxies. We found that this Large Ma...
Evidence for Pre-SN Mass Loss in the Galactic SNR 3C 58
Pre-SN Mass Loss Galactic SNR 3C 58
2009/6/30
Evidence for Pre-SN Mass Loss in the Galactic SNR 3C 58。
Radio Observations of SNR Environments。
H 2-12, A Misidentified Planetary Nebula in Kepler SNR。