搜索结果: 1-15 共查到“知识库 星系天文学”相关记录202条 . 查询时间(3.328 秒)
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水超脉泽观测发现星系NGC4258周期性吸积盘不稳定的证据(图)
水超脉泽 星系NGC4258 周期性吸积盘 不稳定
2023/1/13
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“银河画卷”巡天揭示银河系核风与气体盘作用的证据(图)
银河系核风 气体盘作用 银河画卷
2022/9/14
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中国科学院云南天文台在仙女星系中发现12颗大质量物质转移双星(图)
仙女星系 大质量物质转移 双星
2022/9/22
本文重新导出推迟引力的径向和角向附加分量的一般表达式,获得了分别由径向附加引力引起的轨道进动和由角向附加引力引起的轨道进动及引力辐射的一般表达式。首先, 径向附加引力使水星的推迟轨道的半径稍稍小于牛顿轨道半径, 水星沿此推迟轨道转动的理论角速度稍稍快于按牛顿轨道计算理论角速度;其次,作为非保守力的角向附加引力产生了两项效应:一方面,使水星获得与径向附加作用相等的角速度增量,另一方面,又使水星的角速...
推迟引力与水星轨道进动的完整解
水星轨道进动 推迟引力 角向加速度 双星引力辐射
2015/5/28
本文从角加速度的一般表达式出发, 重新导出径向和角向附加引力的准确表达式,获得了分别由径向附加引力引起的轨道进动和由角向附加引力引起的引力辐射表达式。 计算表明,一方面,径向附加引力使水星的推迟轨道的半径稍稍小于牛顿轨道半径, 水星沿此推迟轨道转动的理论角速度稍稍快于按牛顿轨道计算理论角速度,折算至一百年,水星沿推迟理论轨道转过的角度比沿牛顿理论轨道多转过33角秒; 但径向附加引力是一种保守力, ...
哥白尼日心说推翻了托勒密地心说。开普勒椭圆理论推翻了托勒密摆线方法论。牛顿在《自然哲学的数学原理》里总结出了质心说,揭露了物质运动的本质属性。它是天体运行原理。通过推理,摆线与质心说是不同参考系的同一理论。以公共质心(简称质心)为参考系,两个天体都绕质心运动。用实体变换参考系,太阳绕质心运动,换成质心绕太阳运动。这样,行星绕太阳运动轨道就是摆线。摆线是天体运行的基本轨道。这是质心说和摆线327年的...
1687年,牛顿在《自然哲学的数学原理》里总结出了质心说,揭露了物质运动的本质。质心说是天体运行原理。以公共质心(简称质心)为参考系,所有天体都绕质心运动。如果用实体太阳为参考系,太阳绕质心运动,换成质心绕太阳运动。这样,行星绕太阳运动轨道就是摆线。摆线与质心说是不同参考系的同一个理论。据卡丹转盘揭示,椭圆是特殊的内摆线。所以,开普勒椭圆也是特殊摆线。又因为,天体之间的距离是逐渐变化的。行星和太阳...
The first IRAM/PdBI polarimetric millimeter survey of active galactic nuclei. II. Activity and properties of individual sources
IRAM/PdBI polarimetric millimeter survey properties individual sources
2012/2/21
We present an analysis of the linear polarization of six active galactic nuclei - 0415+379 (3C~111), 0507+179, 0528+134 (OG+134), 0954+658, 1418+546 (OQ+530), and 1637+574 (OS+562). Our targets were m...
We model the chameleon effect on cosmological statistics for the modified gravity f(R) model of cosmic acceleration. The chameleon effect, required to make the model compatible with local tests of gra...
Modelling neutral hydrogen in galaxies using cosmological hydrodynamical simulations
galaxies: evolution: general ?galaxies: luminosity function, mass func-tion ?dark matter ?radio lines: galaxies ?methods: N-body simulations
2011/10/11
The characterisation of the atomic and molecular hydrogen content of high-redshift galaxies is a major observational challenge that will be addressed over the coming years with a new generation of rad...
On Identifying the Progenitors of Type Ia Supernovae
Identifying Progenitors Type Supernovae
2011/10/20
We propose two new means of identifying the main class of progenitors of Type Ia supernovae--single or double degenerate: (i) If the range of supernova properties is significantly determined by the ra...
The complete census of optically selected AGNs in the Coma Supercluster: the dependence of AGN activity on the local environment
Galaxies: clusters: individual: Coma Galaxies evolution Galaxies nuclei
2011/10/11
To investigate the dependence of the occurrence of active galactic nuclei (AGNs) on local galaxy density, we study the nuclear properties of ~5000 galaxies in the Coma Supercluster whose density spans...
Reconstruction of f(R, T) gravity describing matter dominated and accelerated phases
Reconstruction gravity describing dominated accelerated phases
2011/10/12
We investigate the cosmological reconstruction in modified f(R,T) gravity, where R is the Ricci scalar and T the trace of the stress-energy tensor. Special attention is attached to the case in which t...
Measuring a cosmological distance-redshift relationship using only gravitational wave observations of binary neutron star coalescences
neutron stars gravitational waves cosmology
2011/10/14
Detection of gravitational waves from the inspiral phase of binary neutron star coalescence will allow us to measure the effects of the tidal coupling in such systems. These effects will be measurable...
VLBI-selected sample of Compact Symmetric Object candidates and frequency-dependent position of hotspots
Galaxies: active – Galaxies: jets – Radio continuum: galaxies – Methods:numerical – Magnetohydrodynamics (MHD) – Shock waves
2011/9/27
The Compact Symmetric Objects (CSOs) are small (<1 kiloparsec) and powerful extragalactic radio sources showing emission on both sides of an active galactic nucleus and no signs of strong relativistic...