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The radio structure of BL Lac object S5 2007+777

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Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 187-190页

作者： WU ZhongZu1,3,GU MinFeng2 & CHEN YongJun2 1 College of Science,Guizhou University,Guiyang 550025,china 2 Key Laboratory for Research in Galaxies and Cosmology,shanghai astronomical observatory,chinese academy of sciences,shanghai 200030,china 3 NAOC-GZU Sponsored Center for Astronomy,Guizhou University,Guiyang 550025,china Guizhou Univ Coll Sci Guiyang 550025 Peoples R China chinese Acad Sci Shanghai Astron Observ Key Lab Res Galaxies & Cosmol Shanghai 200030 Peoples R China Guizhou Univ NAOC GZU Sponsored Ctr Astron Guiyang 550025 Peoples R China

BL Lac object S5 2007+777 has been classified as a HYMOR(Hybrid Morphology radio source) for its hybrid FR I and FR II radio *** is one of four BL Lac objects with a kpc scale extended X-ray *** this paper,we searched the unpublished European VLBI Network(EVN) archived high resolution data for this source,and present the high resolution radio *** EVN images all show a core-jet structure in 1.6,5 and 8 *** combination with the VLA data in the literature,we found position angle differences(△PA) of about 10°-20° between pc and kpc scale jet *** brightness temperature estimated from multi-band EVN images are around 1011.2-1011.8 K,from which the Doppler factor ranges from 3.2 to *** found significant flux variations of the radio core in 1.6 and 5 GHz,from which we derived the variability in brightness temperature Tvar to be 1013.6 K and 1014.0 K,corresponding to the Doppler factors of 9.3 and 12.4,respectively.

关键词： active galactic nuclei VLBI BL Lac objects

AN ALTERNATIVE DERIVATION OF THE NEUTRALATMOSPHERIC DELAY FORMULA

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中国科学院上海天文台年刊 1996年 107-118页

作者： Yan Haojian(shanghai observatory, chinese academy of sciences, shanghai 200030)

The integration methods along the chord pointed from source to receiver, which wasproposed by Moritz (1967), are developed for various observation scenario. According todifferent accuracy requirements the mapping function is represented as a main term plus cor rection terms. An asymmetric atmospheric distribution is taken into account by means of ahorizontal gradient compensation- The suggested procedures are expected to offer a high ac curacy for the elevation angle down to below 10 degrees, and might be conveniently usedboth in modeling and in calculating the neutral atmospheric delays for different atmosphericprofiles.

关键词：大气折射大气延迟计算方法对流层

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河外星系OH超脉泽的观测和研究

天文学进展 2004年第1期22卷 81-90页

作者：俞志尧中国科学院上海天文台上海200030

自从首次发现河外星系OH超脉泽以来,30多年(特别是近10年)中对河外星系OH超脉泽的观测和研究取得了极大的进展。到目前为止已发现106个河外星系OH超脉泽,其中包括59个较高红移的源。对河外星系OH超脉泽的观测和研究,是探测和研究其所成... 详细信息

自从首次发现河外星系OH超脉泽以来,30多年(特别是近10年)中对河外星系OH超脉泽的观测和研究取得了极大的进展。到目前为止已发现106个河外星系OH超脉泽,其中包括59个较高红移的源。对河外星系OH超脉泽的观测和研究,是探测和研究其所成协的活动星系核、星暴星系的中央源和拱核盘的有效工具。主要评述对河外星系OH超脉泽的搜索、观测和理论研究现状。

关键词：天体物理学河外星系OH超脉泽活动星系核星暴星系天文观测

On the Integrable Motion Equations in FOC by GSSH

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On the Integrable Motion Equations in FOC by GSSH

作者： Chengli HUANG Xinhao LIAO shanghai astronomical observatory, chinese academy of sciences, shanghai 200030, china

For the equations of the infinitesimal elastic-gravitational motion for a rotating, slightly elliptical Earth, one can, with the tool of generalized surface spherical harmonics (GSSH, or GSH), transfer the motion equations from ellipsoidal domain to an effective spherical domain (ESD), and then from vector form to scalar form, so that it is numerically integrable. In the fluid outer core (FOC), due to the cancellation of rigidity in fluid, the tangential tractions vanish identically and the differential equations for the transverse displacement fields do not hold any longer as in solid medium, but they are needed in some work. In this paper, we derive the derivative of the transverse displacements and other motion equations for FOC, they are explicit and in scalar, and the scheme to encode to program is also presented at the end of this paper

关键词： Motion equation Fluid outer core Displacement field Generalized spherical harmonics Elastic-gravitational excitation

来源： cnki会议评论

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章动研究简评

天文学进展 1997年第4期15卷 293-302页

作者：黄乘利中国科学院上海天文台上海200030

对各种章动理论所采用的方法（天体力学的方法、地球物理方法和实测的经验方法）和章动序列进行了简要介绍，对近年来有关的理论研究和观测的进展，特别是自由核章动，进行了评述，并指出其中存在的一些问题．

关键词：天体测量天体力学数据分析章动

The Absolute Proper Motion of M3 and Its Galactic Orbit

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天文研究与技术 1999年第S1期 328-332页

作者： Wu Zhenyu, Wang jiaji ( shanghai observatory, The chinese academy of sciences, shanghai 200030, china )

We have obtained the absolute proper motion of globular cluster M3 from measurements of 14 plates taken with the 40cm refractor at Sheshan station of shanghai observatory, spanning epoch is about 80 years. The positions and absolute proper motions of 24 stars in ACT catalogue are used as the reference frame. The reduction was made with the central overlapping principle. The absolute proper motions of 534 stars in the region of about 1° 5×1° 5 around the cluster M3 are determined. With the new data of proper motions, the membership probabilities of the stars are determined. The mean absolute proper motions for the cluster of -0 3±0 3 mas/yr in R.A. and -3 1±0 3 mas/yr in Dec. were *** our results with the known distance and radial velocity of the cluster, we obtained its space motions and Galactic orbits in two different three component Galactic potentials.

关键词： The Absolute Proper Motion of M3 and Its Galactic Orbit

SEPARATION OF JETS FROM COMET HALE-BOPP'S COMA BY WAVELET METHOD

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中国科学院上海天文台年刊 2000年 101-103页

作者： Tao Jun Qian Bochen Tang Yuan (shanghai astronomical observatory, chinese academy of sciences, shanghai 200030)

A new multiscale technique, the wavelet transform, is applied to the study of jets of comet. It has the advantage to show the features of jets.

关键词： Comet Hale-Bopp - Wavelet - Jet

卫星圆轨道假设对GPS无线电掩星反演地球大气参数的影响

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天文学报 2001年第3期42卷 243-247页

作者：蒋虎中国科学院上海天文台上海200030

给出GPS无线电掩星反演地球大气参数过程中计算大气折射角的解析表达式 .以圆轨道假设下的大气折射角计算值为先验约束 ,采用迭代法对不引入圆轨道假设情况的大气折射角进行归算 ,在此基础 ,利用反演方法得到了引入和不引入圆轨道假定... 详细信息

给出GPS无线电掩星反演地球大气参数过程中计算大气折射角的解析表达式 .以圆轨道假设下的大气折射角计算值为先验约束 ,采用迭代法对不引入圆轨道假设情况的大气折射角进行归算 ,在此基础 ,利用反演方法得到了引入和不引入圆轨道假定两种情况下大气参数 (气压和温度 )的差分序列 .结果表明 :卫星圆轨道假设对GPS无线电掩星反演大气参数的影响 ,在气压方面为 1mbar左右 ,而在气温方面为 1°K左右 .这一结果支持了目前无线电掩星定性误差估计研究中通常引入卫星圆轨道假设这个近似处理方法的合理性 ;同时也表明 :若在高精度反演地球大气参数时。

关键词：全球定位系统无线电掩星地球大气参数卫星圆轨道假设 GPS 大气折射角

GPS Ionospheric mapping and disturbances during geomagnetic storms and earthquakes

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GPS Ionospheric mapping and disturbances during geomagnetic ...