搜索结果: 16-30 共查到“知识库 天体测量学”相关记录294条 . 查询时间(0.563 秒)
基于相关测量MUSER馈源轴比的方法研究
综合孔径 明安图射电频谱日像仪 圆极化 轴比
2016/12/26
明安图射电频谱日像仪是新一代太阳专用射电成像望远镜，超宽带双圆极化接收馈源是其关键技术之一.轴比是反映双圆极化馈源性能的重要指标，单天线测量轴比的传统方法需要标准天线辅助，本文采用基于相关测量干涉阵馈源轴比的方法，针对MUSER天线数目多，且为户外环境，根据天文观测的需求须经常测试天线的性能的特点，简化了干涉阵望远镜测量轴比的过程，且能够高效的得到准确的测量结果.文中对该方法的测量过程做了详细的说...
超高阶次Legendre函数的跨阶数递推算法
Legendre函数 递推算法 双精度数
2015/4/1
本文引入了Legendre函数的跨阶数递推算法,并利用该算法在双精度数范围内计算了按间隔为1°余纬从1°变化至89°对应的直到完整的20000阶次的归一化连带Legendre函数的值.为验证计算精度,通过多种途径对该算法的计算结果进行检验,结果表明:该算法算得的每个阶次连带Legendre函数的值至少具有10-10这样的绝对精度.此外还对该算法的计算用时进行了统计,结果为该算法的计算用时大约是Le...
利用动力学方法解算GRACE时变重力场研究
时变重力场 动力学方法 等效水柱高
2015/4/1
本文利用动力学方法建立GRACE (Gravity Recovery And Climate Experiment) K波段距离变率 (KBRR)观测、轨道观测与重力场系数的观测方程, 通过GRACE Level 1B观测数据,成功解算出全球月时变重力场模型——IGG时变重力场模型,并将2008—2009年的解算结果与GRACE三大数据处理机构美国德克萨斯大学空间中心CSR (Center for...
New insights into galaxy structure from galphat– I. Motivation, methodology and benchmarks for Sérsic models
new galaxy image decomposition tool galphat
2014/12/20
We introduce a new galaxy image decomposition tool, galphat (GALaxy PHotometric ATtributes), which is a front-end application of the Bayesian Inference Engine (bie), a parallel Markov chain Monte Carl...
A GREEN BANK TELESCOPE SURVEY FOR H I 21 cm ABSORPTION IN THE DISKS AND HALOS OF LOW-REDSHIFT GALAXIES
21 cm absorption survey Green Bank Telescope
2014/12/20
We present an H I 21 cm absorption survey with the Green Bank Telescope (GBT) of galaxy-quasar pairs selected by combining galaxy data from the Sloan Digital Sky Survey (SDSS) and radio sources from t...
Iron and helium emission lines in classical T Tauri stars
Emissions Molecular cloud Emissions High resolution Echelle spectrum The center of mass velocity
2014/12/9
Results are presented for the He emission in 31 CTTS from the Taurus-Auriga molecular cloud spanning two orders of magnitude in the mass accretion rate, and for the Fe emission in DR Tau, based on a s...
2MASS view of the LMC: Structure, populations, kinematics
The large Magellanic cloud. 2 quality infrared photometry Magnitude diagram Stars Luminosity function
2014/12/9
The results of a study of the Large Magellanic Cloud based on near-infrared 2MASS photometry are presented. From near-infrared color-magnitude diagram, stellar populations of the LMC are identified an...
Models and observations of the millimeter and submillimeter molecular line emission of bright -rimmed clouds
Mm The mm Molecular line measurement Hereditary hemorrhagic capillaries expansion Observation of hydrodynamic shocks
2014/12/9
We present the results of a comparison of new millimeter and submillimeter molecular line survey of bright-rimmed clouds, observed at FCRAO in the CO (J = 1 → 0), C18O (J = 1 → 0), HCO+ (J = 1 → 0), H...
The clustering of galaxies around damped absorbers
Clustering damping Galaxy Wide-angle image The redshift slices. Bayesian metering redshift technology
2014/12/9
We measured the clustering of galaxies around damped absorbers, all at a redshift of approximately three. For this purpose, we used wide-field images that covered a total area of one square degree. We...
A Frequency Selective Bolometer Camera for Measuring Millimeter Spectral Energy Distributions
Bolometer cameras Frequency selective surfaces Millimeter Transition-edge sensors Energy distributions
2014/12/9
Bolometers are the most sensitive detectors for measuring millimeter and submillimeter wavelength astrophysical signals. Cameras comprised of arrays of bolometers have already made significant contrib...
The AzTEC Millimeter-wave Camera: Design, Integration, Performance, and the Characterization of the (sub-)millimeter Galaxy Population
Detectors Galaxies Instrumentation Starbursts Far-infrared background
2014/12/9
One of the primary drivers in the development of large format millimeter detector arrays is the study of sub-millimeter galaxies (SMGs) - a population of very luminous high-redshift dust-obscured star...
Bayesian Anatomy of Galaxy Structure
Bayesian Statistics Galaxy Markov chain Monte Carlo Morphology
2014/12/9
In this thesis I develop Bayesian approach to model galaxy surface brightness and apply it to a bulge-disc decomposition analysis of galaxies in near-infrared band, from Two Micron All Sky Survey (2MA...
Measures of Star Formation Rates within Galaxies: the Impact of Diffuse Stellar Populations
galaxies:ISM ISM:structure infrared:galaxies infrared:ISM H{\sc ii} regions
2014/12/9
Thanks to the {\it Spitzer Space Telescope}, the infrared (IR) emission have been better studied in the past decades, as well as its relations to star formation rates (SFR) and the calibrations of IR ...
一种新高斯过程分类算法
高斯过程模型 二分类 后验概率 贝叶斯方法
2015/5/19
考虑到星体表面的阴影区在航天器软着陆小天体时可作为导航路标以及壁障参考区，提出一种基于地表阴影区的跟踪算法。首先利用状态参数将拍摄到的前后两帧图像矫正到相同的状态，根据提出的二值化算法对图像的阴影区进行检测；然后利用模板匹配找出阴影区的相关位置点，并通过特征向量法找到相似性最大的位置点；最后结合RANSAC算法去除错匹配对。以两组433Eros的连续拍摄图像作为阴影区进行跟踪实验，结果表明该算法具...