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Unveiling the nature of IGR J17177-3656 with X-ray, NIR and Radio observations
Unveiling IGR J17177-3656 X-ray NIR Radio observations
2011/9/26
We report on the first broad-band (1-200 keV) simultaneous Chandra-INTEGRAL observations of the recently discovered hard X-ray transient IGR J17177-3656 that took place on 2011, March 22, about two we...
VLBI imaging of a flare in the Crab Nebula: More than just a spot
ISM:supernova remnants —radio continuum:stars— pulsars:general —pulsars:individual:Crab pulsar
2011/9/26
We report on very long baseline interferometry (VLBI) observations of the radio emission from the inner region of the Crab Nebula, made at 1.6 GHz and 5 GHz after a recent high-energy flare in this ob...
Varying disc-magnetosphere coupling as the origin of pulse profile variability in SAX J1808.4-3658
accretion accretion discs – pulsars:individual:SAX J1808.4–3658 – stars:neu-tron – X-rays:binaries
2011/9/26
Accreting millisecond pulsars show significant variability of their pulse profiles, especially at low accretion rates. On the other hand, their X-ray spectra are remarkably similar with not much varia...
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...
Electron Temperatures in W51 Complex from High Resolution, Low Frequency Radio Observations
ISM—HII regions—radio continuum—individual (W51)
2010/9/15
W51 is a giant radio complex lying along the tangent to the Sagitarius arm at a distance of about 7 kpc from the Sun, with an extension of about 1◦ in the sky. It is divided into three component...
Precision timing of PSR J1012+5307 and strong-field GR tests
PSR J1012+5307 dipole radiation gravitational constant variation
2010/3/19
We report on the high precision timing analysis of the pulsar-white dwarf binary PSR J1012+5307. Using 15 years of multi-telescope data from the European Pulsar Timing Array (EPTA) network, a signific...
星载测雨雷达探测频段选择仿真研究
星载测雨雷达 GCE模型 反射率因子 Quickbeam雷达模拟软件
2011/7/28
星载测雨雷达必须满足的3个基本条件的基础上，开展了风云三号（FY-3）星载测雨雷达最佳波段组合的研究。文中将高精度GCE(Goddard cumulus ensemble）模式中BOB飓风资料的大气廓线和水凝物廓线作为三维Quickbeam气象雷达模拟软件的输入，分别模拟了5、10、14、35和94 GHz 5个频点星载测雨雷达的探测性能。从近地面层获得较宽的降水动态范围的角度，雷达频点中必须要选...
400年前历史上第一具天文望远镜问世。这是天文学史上划时代的创举，也是现代科学萌芽时期的第一个重大发明。这具望远镜的聚光能力大于肉眼约100倍，是眼睛“望远功能”的巨大延伸。它是伽利略手中立即成为科研利器，很短时间里便取得了一系列突破性的天文发现。继后的历史见证了现代科技登上历史舞台的气势。到今天，即将出台的望远镜的聚光能力已将将超过伽利略望远镜一百万倍；作为广义的“眼的延伸”，各类天文望远镜感应...
Quark-Nova Explosion inside a Collapsar：Application to Gamma Ray Bursts
Quark-Nova Explosion Collapsar Gamma Ray Bursts
2009/9/4
If a quark-nova occurs inside a collapsar, the interaction between the quark-nova ejecta (relativistic iron-rich chunks) and the collapsar envelope leads to features indicative of those observed in Ga...
Photometric and spectroscopic study of seven shakhbazian compact galaxy groups
Photometric compact galaxy spectroscopic
2009/7/10
Photometric and spectroscopic study of seven shakhbazian compact galaxy groups。
The photometric variability of hh 30。
Large scale absorbers in the environment of high-z radio-galaxies。
VLA observations of disks and jets in young close binaries
VLA disks jets young close binaries
2009/6/16
VLA observations of disks and jets in young close binaries。
VLA observations of orbital motions in ylw 15。