美国国家航空航天局NASA每日一图(天文)-2017年8月5日(Gravity’s Grin )

2017 August 5

Gravity's Grin
Image Credit: X-ray - NASA / CXC / J. Irwin et al. ; Optical - NASA/STScI
Explanation: Albert Einstein's general theory of relativity, published over 100 years ago, predicted the phenomenon of gravitational lensing. And that's what gives these distant galaxies such a whimsical appearance, seen through the looking glass of X-ray and optical image data from the Chandra and Hubble space telescopes. Nicknamed the Cheshire Cat galaxy group, the group's two large elliptical galaxies are suggestively framed by arcs. The arcs are optical images of distant background galaxies lensed by the foreground group's total distribution of gravitational mass. Of course, that gravitational mass is dominated by dark matter. The two large elliptical "eye" galaxies represent the brightest members of their own galaxy groups which are merging. Their relative collisional speed of nearly 1,350 kilometers/second heats gas to millions of degrees producing the X-ray glow shown in purple hues. Curiouser about galaxy group mergers? The Cheshire Cat group grins in the constellation Ursa Major, some 4.6 billion light-years away.

2017年8月5日

Gravity的Grin 
图像来源: X射线 - NASA / CXC / J. Irwin等 ; 光学 - NASA / STScI
说明: 爱因斯坦的爱因斯坦 一般超过100年前的一般相对论预言了引力透镜现象。这就是通过从Chandra和哈勃太空望远镜的X射线和光学图像数据看到的,这些遥远的星系如此异乎寻常的外观 。昵称为柴郡猫星系,该组的两个大椭圆星系被弧线暗示。 弧是 由前景组的重力质量的总分布透镜的遥远背景星系的光学图像。当然,这个引力质量是由暗物质所主导 的。两大椭圆“眼” 星系代表着自己的星系团体中最亮的成员。他们的相对碰撞速度近1350公里/秒,将气体加热到数百万度,产生紫色色调的X射线辉光。好奇的星系集团合并?柴郡猫 集团 在大熊座少校大概 46亿光年。

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