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Einstein@Home 屏保(S5R3)

Einstein@Home 的屏保

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. The positions of the detectors relative to the stars changes periodically over a 24 hour period. If you went to one of the detector sites, the stars visible directly overhead at any time are the same ones that appear next to the detector on your screensaver. (This assumes of course that your computer's time and timezone are correctly set!) Also shown are the positions of the known pulsars and supernovae remnants, and a marker indicating the positions being searched as the calculations proceed. When the graphics are shown in a separate window (not as a screensaver) the user can control the display with the mouse and keyboard.

Stars and Constellations

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. You can use the mouse (as described below) to zoom to the inside of the celestial sphere, where the constellations will look like they normally do in the night sky.

Einstein@Home 屏保的内容与探测引力波的实验有很多联系:比如 LIGOGEO600 的位置、已知的引力波发射体和你的计算机当前正在分析的天空区域。屏保的主体是一个旋转的天球,天球(地心天球)是一个假想的以地球为中心的球体,然后再将星体投影在这个球体上。天球上标识出了星座的主要星体位置,但可能与你熟悉的有所不同,因为你现在是从天球外面而不是地球上观测它们。

Gravity Wave Observatories

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.

“L”型的标记表明的是两个 LIGO 观测站的天顶位置。“L”型对应于探测器的实际方位,当然,探测器并没有标记所看上去的那么大。

Eah-logo lho.gif 汉福 LIGO 观测站 (LHO)
Eah-logo llo.gif 李文斯顿 LIGO 观测站 (LLO)
Eah-logo geo.gif GEO 600

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.



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.


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.


Eah logo marker.gif

Search Marker

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. Details on how we search for gravity waves coming from a particular source will be linked from here sometime in the future.


Mouse and Keyboard Controls

When the graphics are displayed in a separate graphics window (rather than as a screensaver) you can control the display with the mouse and keyboard. To zoom in or out or rotate the starsphere hold down the appropriate mouse button and move the mouse up and down or left and right.

zoom in or out
rotate the star sphere

相关内容及图片由 Eric Myers(美国纽约州 Vassar 学院天体物理系)、David Hammer(位于美国密尔沃基的威斯康星州立大学物理系)和 Bruce Allen(位于美国密尔沃基的威斯康星州立大学物理系)提供。


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