Molecular Gas Distribution around the Supernova Remnant G40.5-0.5     

Ji Yang  Jie-Long Zhang  Zhi-Yong Cai  Deng-Rong Lu  You-Heng Tan Purple Mountain Observatory  Chinese Academy of Sciences  Nanjing  Key Laboratory of Particle Astrophysics  Institute of High-Energy Physics  Chinese Academy of Sciences  Beijing National Astronomical Observatories  Chinese Academy of Sciences  Beijing 《中国天文和天体物理学报》2006,6(2):210-216

The distribution of dense molecular gas around the supernova remnant G40.5-0.5 has been investigated by radio spectroscopic observations in the CO (J = 1-0) transition. The molecular gas is found to extend over the entire region of G40.5-0.5. A molecular shell, with a diameter of - 26', coincides with the ionized gas as revealed by the cm-radio observations. This coincidence, along with the velocity discontinuity following the shell, provides direct evidence for interaction between the ionized gas and the dense molecular gas. No clear evidence for cosmic-ray acceleration can be identified from this SNR as previously suggested, due to positional uncertainty in relating the SNR shell defined by CO to the EGRET gamma-ray sources, GRO J1904 06, from the gamma-ray observations.  相似文献   

Identifying spatial characteristics of transmissivity using simulated annealing and kriging methods     

Yu-Pin Lin  Yih-Chi Tan  Shahrokh Rouhani 《Environmental Geology》2001,41(1-2):200-208

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γ射线脉冲星脉冲位相关系的研究     

王仲翔 《天文学报》1997,38(4):441-445

本文分析γ射线脉冲星最近的观测数据，研究各波段辐射位相的一些关联，它们对于揭示γ射线脉冲星的辐射机制可能有重要的意义，  相似文献   

The non-synchronous systems among RS CV_N stars     

Tan Hui-aong  Wang Xun-hao  Pan Kai-ke 《Chinese Astronomy and Astrophysics》1991,15(4):461-469

An RS CVn star is considered as non-synchronous if its orbital period differs by more than 4% from its photometric period. Of 88 systems examined according to this criterion, 67 are synchronous, 21 are non-synchronous. For the 21 non-synchronous systems, we find their spectral types are most around KO-2 III, that their orbital eccentricities are larger and their chromospheric activity lower than the average level.  相似文献   

The standard systems of stellar rotation measurements (II)     

Pan Kai-ke  Tan Hui-song 《Chinese Astronomy and Astrophysics》1993,17(4):393-400

The limb darkening effect on the measurement of stellar rotation is discussed in this paper. It is shown that this effect plays an important role in the measurement of V_e sin i. In the extreme case with the limb darkening coefficient of 1.0, it may cause a difference up to 17%. As a sequel to paper [1], this work presents the following new explanation for the systematic differences between Slettebak's new and old systems. The main causes of the systematic differences are: (1) The old system made an inadequate twice repeated correction for the limb darkening. (2) Owing to the historical reason, the old system used too large limb darkening coefficients.  相似文献   

昆仑山口西Ms8.1地震的地壳变形特征   总被引：33，自引：15，他引：18  

乔学军  王琪  杜瑞林  陈宗时  游新兆  谭凯 《大地测量与地球动力学》2002,22(4):6-11

利用全球定位系统1991－2001年及震后4期GPS观测数据。获得了2001年11月14日昆仑山口西地震（Ms8.1)的同震和震后形变运动图像，跨破裂带GPS网最近两点测得的最大同震形变为1.9m左右，而震后4个月断层蠕滑引起的变形约为80mm，破裂带两侧震后变形幅度具有非对称性。南侧震后变形基本是北侧的2－3倍。研究结果显示破裂带南盘在震后向偏东方向有明显移动，预示本次地震后能量的重新分配与积累，根据近几十年以来东昆仑断裂带的大地震由西向东扩展的特点，未来地震有向东迁移的可能。  相似文献   

γ射线暴的研究进展（Ⅲ）：GRO的最新观测结果及理论模型     

韦大明 《天文学进展》1995,13(3):234-248

介绍了ＣｏｍｐｔｏｎＧＲＯ卫星对Ⅱ暴的最新观测结果。观测表明，γ暴源的空间分布是各向同性但不均匀的。这种分布基本上排除了γ暴起源于银盘内中子星的模型，表明γ暴要么位于展延的银晕里，要么位于宇宙学距离上。  相似文献   

南流江中上游毛蟹调查初报     

谭红  陈德桢  黄本佳  陈家靖  刘小军 《广东海洋大学学报》1991,(2)

对北部湾南流江水系的日本绒螯蟹合浦亚种(Eriocheir japonicus hepu ensis Dai 1900)的形态特征、生态习性、分布状况、捕捞运输、经济价值、资源利用作了阐述,并对如何加强资源保护提出4点建议。  相似文献   

CHARACTERISTICS OF CRUSTAL DEFORMATION RELATED TO Ms8.1 KUNLUNSHAN EARTHQUAKE     

Qiao Xuejun )  Wang Qi  )  Du Ruilin  )  Chen Zongshi )  You Xinzhao )  Tan Kai ) ) Institute of Seismology  China Earthquake Administration  Wuhan  China ) Second Crust Monitoring  Application Center  CEA  Xi’an  China ) Center for Analysis  Predication  CEA  Beijing  China 《大地测量与地球动力学》2003,23(Z1)

1　IntroductionTheBogedabanapexofKunlunmountainanditsneighborhoodregionlocatedattheboundaryofXinjiangandQinghaiprovinceswerehitbyaMs8.1earthquakeonNovember 1 4,2 0 0 1 .ThisisthestrongestearthquakewithmagnitudebiggerthanMs8.0inmainlandChinasinceacomparableearth quakehappenedinDangxiongofTibetonNovember1 8,1 95 1 .TheepicenterdeterminedbyChineseseismicnetworkislocatedatN36.2°,E90 .9°,40 0kilometersawayfromRuoqiangcountyofXinjiangprovinceand 35 0kilometersfromGolmudcityre spectively.Mea…  相似文献   

2021年5月21日云南漾濞6.4级地震灾害损失快速评估结果分析     

任静  张方浩  李志强  陈经纶  李晓丽  于晨  谭专条  陈雅慧  黄帅堂  姚琪 《震灾防御技术》2021,16(3):454-466

本文针对2021年5月21日云南漾濞6.4级地震,选取不同的地震烈度衰减关系模型,对各模型地震影响场评估结果与发布的地震烈度图进行对比分析,并对地震影响范围不确定性进行研究。选取多种死亡人数评估模型,分别计算各模型在不同地震影响场下的死亡人数、人口分布数量,探讨各地震影响场模型下的人口分布特征及影响人员死亡的主要因素。通过对比分析可知,导致此次地震灾害损失评估结果与真实地震现场结果不同的主要原因是地震影响场分布、人口分布、房屋建筑抗震能力偏差、地形地貌、次生灾害等多种因素不同。研究结果表明,有效提高地震灾害损失快速评估精确性的途径为提高地震影响场评估精度,提高人口分布、房屋建筑等数据空间分布评估精度,后期专家检验等。  相似文献