查询词典 quasar

It is found that for strong Lyman α absorption lines 〓 galactic haloes and satellites can explain～20 per cent and 40 per cent of the line number density of the Quasar Absorption Line Key Project respectively.

我们给出了半解析模型并做了蒙特卡罗模拟，我们考虑了三种主要的吸收成分：星系的气体晕、旋涡星系的盘、以及大星系周围的卫星星系。

Keywords: quasar absorption line systems; semi-analytical models; galaxy formation; simulations

中文关键词：类星体吸收线系统；半解析模型；星系形成；数值模拟

To assess the importance of quasar outflow we have performed a series of studies on broad absorption line quasars, and have obtained the following results.

为了确定外流的重要性，中国科学技术大学天体物理中心开展了宽吸收线类星体的一系列研究，取得了一些进展：(1)宽吸收线区的紫外吸收物质的柱密度比原来预计高出2个量级，低电离吸收线形成于饱和的高电离吸收线区；(2)射电宁静的宽吸收类星体吸收物质主要在赤道面，并且不同的源吸收物质分布情况很不相同，而在射电强的类星体中，赤道和极向外流都是可能的；(3)共振散射线偏振表明，外流物质携带角动量。

The accretion onto the black hole is the source of the quasar's energy.

黑洞吸积是类星体的能量来源。

The system has a nuclear region of quasar-like luminosity, but shows no direct evidence for an active nucleus.

该系统有一个类星体般光度的核心区域，但是没有直接证据表明有一个活动的核。

Now, in a posting on the Galaxy Zoo blog, Dr Keel and Dr Lintott suggest that the galaxy right next door to the voorwerp used to be a quasar (a very bright active galactic nucleus) that has since eaten up all its fuel.

现在，在星系动物园博客上的一个帖子中，Keel 博士和 Lintott 博士认为在"物体"旁边的星系曾经是个类星体（一种很明亮的活跃星系核），但现在已经把它的燃料给消耗光了。

This paper has collected all available optical B magnitudes of quasar 3C345 of more than 100 years, and acquired it's long-term light curve.

收集了类星体3C345光学B波段100多年来较为完备的观测数据，获得了其长期光变曲线。

Bao. I think he does not know the : quasar physics at all!: A simple reason: astronomers detected redshifts of quasars based on the spectr : al lines emitted from the emission line regions, which are 0.1 to 1 parsec (1p : arsec=3.26 light years) far away from the central black hole. Therefore there : is very little effect from the gravitational redshift!

观察到的类星体的光可在几日内有明显的变化，可见类星体的发光区大小在光日尺度以下，即使你认为类星体的光谱线产生于吸积盘，那么吸积盘的大小须在光日尺度以下才能不相矛盾，请你说出一个你认定的类星体吸积盘的大小尺度与该尺度内所具有的质量，及因此计算出的可忽略的引力红移。

This quasar was the only one without a known host galaxy.

这是唯一一个没有已知的宿主星系的类星体。

Their association with the quasar is therefore strong evidence that this is the object that created them.

因此存在于类星体中的事实为类星体创造了它们提供了强有力的证据。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。