类星体

They have discovered now, previou sly unimagined objects-pulsars, quasars, and black holes.

他们发现了以往想象不到的新客体——脉冲星、类星体和黑洞。

They have discovered now, previously unimagined objects-pulsars, quasars, and black holes.

他们发现了以往想象不到的新客体――脉冲星、类星体和黑洞。

By studying the formation time－distribution of dark matter haloes, we have discussed the correlation of formation and evolution between dark halo and QSO absorption systems based on the numerical simulation and semi-analytical model.

研究了暗晕的形成红移分布，正在利用数值模拟和半解析理论研究暗晕的形成和演化与类星体吸收线系统的演化之间的关系。

We studied the relation between their radio and optical luminosities and found a nearly linear correlation.

所得研究结果表明，射电噪类星体的射电光度与光学光度之间存在线性相关性。

If big galaxies indeed possess such large numbers of DM satellites and they possess gas, these satellites may play an important role for strong Lyman α absorption lines.

模型预言的由星系气体晕与卫星星系产生的强赖曼α吸收线系统分别能解释哈勃空间望远镜类星体吸收线重点项目的结果的约20％及40％。

Several unusual properties make this object particular interesting:(1) ultra-luminous near and far infrared (L〓≈10〓L〓, and L〓≈10〓 L〓) emission,(2) very strong optical Fe Ⅱ emission (R〓≈4.35),(3) apparently blueshifted optical Fe Ⅱ multiplets (several hundred km/s),(4) the strongest radio emission among radio-FIR selected NLS1's and extreme Fe Ⅱ emitters,(5) composite Balmer lines with both narrow and broad components (the latter blueshifted by about 1000 km s〓).

我们发现2MASS0153+260为首例超强光学FeⅡ线射电类星体，具有如下极为有趣特征：(1)远红外和近红外光度非常高，L〓≈10〓 L〓且L〓≈10〓 L〓；(2)光学FeⅡ线发射特别强，R4570≈4.35；(3)光学FeⅡ线相对于禁线和氢Balmer线窄成分有明显蓝移，Δυ～4×10〓kms〓；(4)在射电-远红外选NLS1和超强光学FeⅡ线AGN中射电辐射最强；(5)具有复杂的Balmer发射线轮廓，宽成分相对于窄成分和禁线有～1000km s〓的蓝移。

In order to making an initial statistical research for the AGNs evolution, we investigated the distribution of the redshift and the spectral index and the flux densities in different wavebands.

从本文统计的谱指数和红移的关系图可以看出gamma波段的谱指数比x波段高，在天体的演化过程中是由高能量天体演化成低能量天体，从而得出一个演化序列：BL Lac天体过渡到低偏振类星体。

Since the first discovery of the Trans-Neptunian objects in 1992, nearly one thousand new members have been added to our solar system, among which several are of size comparable to or even larger than Pluto.

自从1992年第一次发现有所谓的海王星外星体以来，陆续已有将近千颗的这类星体被归纳在我们的太阳系之中，这些物体甚至有接近或大过冥王星的尺寸。

This explains why there are no nearby quasars.

这解释了为什么附近没有类星体。

This paper presents a novel method for redshift determination of quasars.

给出了一种新的类星体光谱的红移测量方法。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了