星系

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。

In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct "grand-design" spiral structure that is about 3,300 light-years long. Only galaxies with large-scale bars appear to have these grand-design inner disks — a spiral within a spiral. Models suggest that the gas in a bar can be funneled inwards, and then spiral into the center through the grand-design disk, where it can potentially fuel a central black holes. NGC 1300 is not known to have an active nucleus, however, indicating either that there is no black hole, or that it is not accreting matter.

星系演化除了像两个星系相撞那样的剧烈作用之外，还有自己内部很慢的演化，因为一个星系总会有一些引力不稳定，如上图中的NGC1300，它是一个棒旋星系，这种bar结构导致的引力不完全对称会驱使很多气体和尘埃损失角动量往里面落，我们可以清楚的看到dust lanes，有点像黑洞的吸积，但这个星系是个非活动星系，目前还没有黑洞存在的明确证据，but我相信肯定是有的，没有比在星系中心放一个黑洞再完美不过的事情了，或许这些下落的dust lanes是黑洞发光的开始呢。

In the center of NGC 6240, the two black holes in the cores will whip up a frenzy of radiation as they careen towards one another head-on, likely transforming the galaxy into a monster known as an ultra-luminous infrared galaxy, thousands of times as bright in infrared as our Milky Way.

在NGC 6240星系的中心，星系内核中的两个巨大黑洞将激发狂乱的辐射物，加剧两个星系内核的合并进程，很可能会使它们合并成为一个超明亮的红外星系，其红外线亮度是银河系的数千倍。

Lyran humans scattered around many star systems （pleiades,andromeda,Tau Ceti...

天琴星系的人类分散到了许多其他星系（昂宿星系，仙女星系，鲸鱼座天仑五星。。。

A spiral galaxy in the Coma Berenices constellation, Messier 64, the famous "Black Eye" galaxy or the "Sleeping Beauty galaxy," has a spectacular dark band of absorbing dust in front of the galaxy's bright nucleus.

该星系是一个旋涡状星系，位于后发座，被称为"梅西耶64"、"黑眼"星系、或者"睡美人星系"，在该星系明亮的内核前边是极其壮观而有趣的黑色尘埃云团。

Astronomers have spent many decades trying to measure basic galaxy properties such as age, mass or dustiness that may give us some clues as to how they formed and evolved and what precisely the connection between spiral and elliptical galaxies is.

天文学家花费了几十年试图去估量基本的星系特性，比如年龄，质量或者含尘量，这些可能会给我们关于星系是如何形成和发展的以及椭圆星系和螺旋星系之间的精确联系是怎样的一些线索。

Red galaxies mainly consist of bulge- dominated objects, while around 1/5 of those presents disk-dominated profile but observationally face-on, so-called diffuse red galaxies.

红色星系的组成主要为结构以核球为主的星系，然而有大约1/5的红色星系为结构以圆盘为主、且为观测上面向的星系，我们称之为扩散红色星系。

Narrow Line Seyfert 1s (NLS1s, including high luminosity quasars with similar properties) are very important extrema of type Ⅰ AGNs. The unusualness of NLS1s is very useful to test the viabilities of AGNs models and thus provide a new way probing into AGN phenomena. The ratio of Fe to α-element (e. g., O, Ne, Mg...), Fe/α, can serve as an excellent indicator for constraining the ages of star-forming systems.

中文题名窄线SeyfertⅠ星系与活动星系核光学FeⅡ发射线副题名外文题名论文作者周宏岩导师周又元王挺贵学科专业天体物理研究领域\研究方向学位级别博士学位授予单位中国科学技术大学学位授予日期2003 论文页码总数127页关键词活动星系核河外星系馆藏号BSLW /2003 /P15 /7 窄线SeyfertⅠ型星系(Narrow Line Seyfert 1，NLS1，包括具有类似性质的类星体)是具有极端性质非常重要的一类Ⅰ型AGN，对NLS1的深入研究是限制和完善活动星系核理论模型的一条新途径。

In this paper, the distribution of four subclasses of four subclasses of Seyfert Galaxy ( Seyfert 1s,Seyfert 1.5s, Seyfert 2s and Seyfert 3s or lin -ers)in the two -color diagram are comoared, It is found that the four subclasses have significantly different distribution in two -color diagram and have significantly different average color index, and especially Seyfert 1s are bluer than Seyfert 2s.

文章比较了四种赛弗特星系子类(1型赛弗特星系，1.5型赛弗特星系，2型赛弗特星系和3型赛弗特星系或低电离核星系)大双色图中的分布情况。结果发现四种赛弗特星系子类在双色图中具有显著不同的分布，特别地1型赛弗特星系比2型赛弗特星系要蓝。

A spiral galaxy in the Coma Berenices constellation, Messier 64, the famous "Black Eye" galaxy or the "Sleeping Beauty galaxy," has a spectacular dark band of absorbing dust in front of the galaxy's bright nucleus.

该星系是一个旋涡状星系，位于后发座，被称为&梅西耶64&、&黑眼&星系、或者&睡美人星系&，在该星系明亮的内核前边是极其壮观而有趣的黑色尘埃云团。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。