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发表于 2005-11-4 21:53:18
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屏保里显示的是什么？
The Einstein@Home Screensaver has a number of elements related to current efforts to detect gravitational radiation from periodic sources such as pulsars. The primary element of the screensaver is a rotating celestial sphere showing the known constellations, along with the current zenith positions of three gravity wave detectors. Also shown are the positions of the known pulsars and supernovae remnants, and a marker indicating the positions being searched as the calculations proceed.
Einstein@home屏保的内容与从脉冲星探测引力波的实验有很多联系。屏保的主体是一个旋转的天球，上面显示了人们熟知的星座和三个引力波观测站的天顶位置，已知的脉冲星和超新星残骸位置也有显示，还有一个标记用来指明分析过程中当前的搜寻位置。
Stars and Constellations
星体与星座
The rotating sphere shows the major stars of the constellations. You may have trouble at first recognizing some of the constellations; they will be backwards from what you are accustomed to - because you are viewing them from outside the celestial sphere rather than from the vantage point of the earth.
旋转的天球上显示了星座中的主要星体。乍看上去，你也许会对一些星座感到困惑，它们与你熟知的星座是相反的 - 这是因为你正在从天球外面而不是地球上观察它们。
Gravity Wave Observatories
引力波观测站
Each of the "L" shaped markers on the starsphere represents the current zenith position (point directly upward) for one of the instruments which collects the data analyzed by Einstein@Home. The "L" shape comes from the fact that the detectors are basically very large Michelson interferometers. The orientation of the detectors is correct, but they are not to scale.
天球上每一个L型的标记均表示一个观测站的天顶位置，正是这些观测站采集了Einstein@home所分析的数据。之所以是L型，是因为这些探测器本质上只是一个非常大的迈克尔逊干涉仪，探测器的实际方位与标记的方向是相符的，当然，探测器并没有标记所看上去的那么大。
LIGO Hanford Observatory (LHO)
Hanford, Washington, USA, (N 46.45°, W 119.41°)
consisting of two interferometers, one with 4km arms (H1) and one with 2km arms (H2).
汉福LIGO观测站
美国 华盛顿 汉福 北纬46.45度 西经119.41度
拥有两套干涉仪，一套臂长为4公里，另一套为2公里。
LIGO Livingston Observatory (LLO)
Livingston, Louisiana, USA, (N 30.56°, W 90.77°)
consisting of one interferometer with 4km arms (L1).
拥有一套干涉仪，臂长4公里。
李文斯顿LIGO观测站
美国 路易斯安娜州 李文斯顿 北纬30.56度 西经90.77度
GEO600
Hanover, Germany, (N 52.24°, E 9.81°)
consisting of one interferometer with 600m arms.
德国 汉诺威 北纬52.24度 东经9.81度
拥有一套干涉仪，臂长600米。
If you have set your system clock to the correct time then the instruments will be shown in the correct relationship to the stars on the celestial sphere. If you watch over the period of a day you will see that they move around the celestial sphere once in a period of 24 hours.
如果你的系统时间设置正确，屏保中所显示的将与当前天空中的实际星体位置相符。如果你对着屏保看一天，上面的星体也将在24小时内围绕天球旋转一圈。
Pulsars and Supernovae Remnants (SNRs)
脉冲星与超新星残骸
The purple dots represent the known pulsars, which have been detected electromagnetically. Notice that these are clustered in the plane of our galaxy (the Milky Way), predominantly toward the center of the galaxy. You may also notice two small clusters of pulsars in the celestial southern hemisphere. These pulsars are located in the large or small Magellanic Clouds.
屏保中紫色的点表示已知的通过电磁方法探测到的脉冲星。你会注意到这些点分布在银河系所在的平面上，而且主要分布在银河的中心。在南半球也有两块小的脉冲星聚集处，它们位于大小麦哲伦云中。
The dark red dots represent the known supernova remnants. These are also clustered toward the center of the galaxy. Supernovae remnants are of particular interest for gravity wave hunters because some of these supernovae may have left behind a pulsar or spinning neutron star which might produce periodic gravity waves.
屏保中暗红的点表示已经的超新星残骸。它们也主要聚集在银河的中心，科学家们对超新星残骸特别感兴趣的原因是部分超新星残骸中可能还存留有一个脉冲星或者自旋中子星，而这些都会产生周期性的引力波。
Search Marker
搜寻标记
The orange marker shaped somewhat like a gun-sight represents the current position in the sky which is being searched. The location is also noted in the lower right corner in celestial coordinates (Right Ascension and Declination). You will see this marker move from point to point as the search progresses.
屏保中橙色的像瞄准器的标记代表天空中的当前搜寻位置。这个位置也以天球坐标形式显示在右下角（赤经和赤纬）。搜寻过程中你会看到这个标记一点点地移动。
Information and Graphics Courtesy of:
Eric Myers
Dept. of Physics
and Astronomy
Vassar College
David Hammer
Dept. of Physics
University of Wisconsin at Milwaukee
Bruce Allen
Dept. of Physics
University of Wisconsin at Milwaukee
相关内容及图片由Eric Myers、David Hammer和Bruce Allen提供。
[ Last edited by Youth on 2005-11-4 at 22:02 ] |
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发表于 2005-10-29 19:13:29