搜索结果: 61-75 共查到“星系动力学”相关记录112条 . 查询时间(1.92 秒)
On the pulse-width statistics in radio pulsars. II. Importance of the core profile components
stars:pulsars:general – stars:neutron – stars:rotation
2011/9/27
We performed a statistical analysis of half-power pulse-widths of the core components in average pulsar profiles. We confirmed an existence of the lower bound of the distribution of half-power pulse-w...
Cross-helicity effects and turbulent transport in magnetohydrodynamic flow
Cross-helicity effects turbulent transport magnetohydrodynamic
2011/9/28
In the presence of large-scale vortical motions and/or magnetic-field strains, the turbulent cross helicity (velocity--magnetic-field correlation in fluctuations) may contribute to the turbulent elect...
Towards Quark Deconfinement in Neutron Stars via Spindown: Gravitational Waves or Magnetic Braking?
Quark Deconfinement Neutron Stars Gravitational Waves Magnetic Braking
2011/9/28
A phase of interacting quark matter can arise inside the dense core of isolated neutron stars when they have been sufficiently spun down from their initial rapidly rotating configuration. In this work...
We have observed the radio nebula surrounding the Galactic LBV candidate G79.29+0.46 with the EVLA at 6 cm. These new radio observations allow a morphological comparison between the radio emission, wh...
The SAURON Project - XIX. Optical and near-infrared scaling relations of nearby elliptical, lenticular and Sa galaxies
galaxies: bulges – galaxies: elliptical and lenticular, cD – galaxies: photometry – galaxies: structure – galaxies: stellar content – galaxies: fundamental parameters
2011/9/27
[Abridged] We present ground-based MDM V-band and Spitzer/IRAC 3.6um-band photometric observations of the 72 representative galaxies of the SAURON Survey. In combination with the SAURON stellar veloci...
Galaxy clustering in the CFHTLS-Wide: the changing relationship between galaxies and haloes since z ~ 1.2
Cosmology: observations - large-scale structure of Universe - Galaxies: distances and redshifts - Galaxies: evolution - Galaxies: haloes
2011/9/27
We present a detailed investigation of the changing relationship between galaxies and the dark matter haloes they inhabit from z ~ 1.2 to the present day. We do this by comparing precise galaxy cluste...
Nucleosynthesis origin of PG 1159 stars, Sakurai's object and of rare subclasses of presolar grains
Nucleosynthesis subclasses presolar grains
2011/9/27
We discuss theoretical AGB predictions for hydrogen-deficient PG 1159 stars and Sakurai's object, which show peculiar enhancements in He, C and O, and how these enhancements may be understood in the f...
Causal Relativistic Fluid Dynamics
Relativisitic fl uid dynamics relativistic kinetic theory expand- ing medium
2011/10/18
We derive causal relativistic fluid dynamical equations from the relaxation model of kinetic theory as in a procedure previously applied in the case of non-relativistic rarefied gases. By treating spa...
Galaxy And Mass Assembly (GAMA): the red fraction and radial distribution of satellite galaxies
surveys – galaxies:star formation – galaxies:interaction – galaxies:evolution – galaxies:formation – galaxies: dwarf
2011/9/26
We investigate the properties of satellite galaxies that surround isolated hosts within the redshift range 0.01 < z < 0.15, using data taken as part of the Galaxy And Mass Assembly survey. Making use ...
Obliquely rotating pulsars: current screening
Obliquely rotating pulsars current screening
2011/9/26
Pulsar electrodynamics has been built up by taking ingredients from two models, the vacuum-dipole model, which ignores the magnetosphere but includes the inductive electric field due to the obliquely ...
据英国媒体5月12日报道，近日欧洲科学家发现，太阳系距离我们最远的矮行星妊神星(Haumea)的表面被透明冰层所包裹。据报道，欧洲南部天文台(EuropeanSouthernObservatory)表示，这颗形状似橄榄球的矮行星于2004年被发现，它表面的75%被冰层覆盖。同时这颗矮行星的一个名为Hi'iaka的卫星也同样被冰层覆盖。
这种现象在矮行星中并不常见，专家认为这个现象可能说明妊神星有...
据英国媒体5月12日报道，近日欧洲科学家发现，太阳系距离我们最远的矮行星妊神星(Haumea)的表面被透明冰层所包裹。据报道，欧洲南部天文台(EuropeanSouthernObservatory)表示，这颗形状似橄榄球的矮行星于2004年被发现，它表面的75%被冰层覆盖。同时这颗矮行星的一个名为Hi'iaka的卫星也同样被冰层覆盖。
这种现象在矮行星中并不常见，专家认为这个现象可能说明妊神星有...
独特双星系统解开脉动恒星之谜（图）
独特双星系统 脉动恒星之谜
2010/11/29
北京时间2010年11月25日消息，天文学上精确测定恒星和星系的距离长期以来一直是让天文学家们困扰的难题，除去三角视差等经典方法，有一类特殊的天体，为天文学家提供了一个“量天尺”。这就是造父变星(Cepheid Variable)。和太阳不同，造父变星会按照一定的周期规律性地变亮再变暗，周期从几天到几个月不等。这是因为它的大气温度会产生有规律的冷热变化，因而导致整个恒星体有规律地膨胀或收缩。
中法研究人员合作揭示仙女座星系成因（图）
研究人员 仙女座星系 成因
2010/11/25
国国家科研中心2010年11月22日发表公报说，该机构与巴黎天文台以及中国科学院国家天文台合作，用数字模拟技术对本星系群的仙女座星系和麦哲伦星云成因进行了研究。他们认为，仙女座星系很可能由两个星系在数十亿年前发生剧烈撞击后形成。
中国科学院上海天文台刘庆会、郝蕾获得上海市浦江人才计划支持
刘庆会 郝蕾 上海市浦江人才计划
2010/7/9
上海市为进一步支持和鼓励海外高层次留学人员来沪工作和创业，优化上海自主创新发展环境，委托上海市人力资源和社会保障局、上海市科学技术委员会启动实施上海市浦江人才计划项目申报工作。