4大天文望远镜联手献出车轮星系彩照
2009年04月07日 14:13中国新闻网四个不同的天文望远镜日前共同拍摄到了一个非常壮观的车轮状万花筒星系。它的直径为10万多光年，距离地球5亿光年。它与众不同的外型是由几百万年前此星系和图片左下方一个小型星系发生灾难性碰撞造成的。当此小型星系"陷落"在此万花筒星系中时，此小型星系在此万花筒星系的气体中产生压缩波，从而触发恒星爆发性诞生，并照亮了此星系的边缘。在此图中，每一个天文望远镜添加一种色彩，最终形成这幅如此绚丽的合成图像。其中，星系演化探测器添加的是淡蓝色；哈勃望远镜添加的是绿色；斯皮策太空望远镜添加的是红色；钱德拉X射线望远镜添加的是紫色。http://ipac.jpl.nasa.gov/media_images/sig06-005.jpg 漂亮::070821_09.jpg:: 这个图不是最新的吧，我昨晚在NASA看到此图，它不在第一位置啊？
http://sscws1.ipac.caltech.edu/Imagegallery/image.php?image_name=sig06-005 本帖最后由 gohomeman1 于 2009-4-8 10:42 编辑
http://www.nasaimages.org/ 网站的相关文字
Release Date:2006/01/11
This false-color composite image shows the Cartwheel galaxy as seen bythe Galaxy Evolution Explorer's Far Ultraviolet detector (blue); theHubble Space Telescope's Wide Field and Planetary Camera-2 in B-bandvisible light (green); the Spitzer Space Telescope's Infrared ArrayCamera (IRAC) at 8 microns (red); and the Chandra X-ray Observatory'sAdvanced CCD Imaging Spectrometer-S array instrument (purple).
Approximately 100 million years ago, a smaller galaxy plunged throughthe heart of Cartwheel galaxy, creating ripples of brief starformation. In this image, the first ripple appears as anultraviolet-bright blue outer ring. The blue outer ring is so powerfulin the GALEX observations that it indicates the Cartwheel is one of themost powerful UV-emitting galaxies in the nearby universe. The bluecolor reveals to astronomers that associations of stars 5 to 20 timesas massive as our sun are forming in this region. The clumps of pinkalong the outer blue ring are regions where both X-rays and UVradiation are superimposed in the image. These X-ray point sources arevery likely collections of binary star systems containing a blackhole(called Massive X-ray Binary Systems). The X-ray sources seem tocluster around optical/UV bright supermassive star clusters.
The yellow-orange inner ring and nucleus at the center of the galaxyresult from the combination of visible and infrared light, which isstronger towards the center. This region of the galaxy represents thesecond ripple, or ring wave, created in the collision, but has muchless star for mation activity than the first (outer) ring wave. Thewisps of red spread throughout the interior of the galaxy are organicmolecules that have been illuminated by nearby low-level starformation. Meanwhile, the tints of green are less massive, oldervisible light stars.
Although astronomers have not identified exactly which galaxy collidedwith the Cartwheel, two of three candidate galaxies can be seen in thisimage to the bottom left of the ring, one as a neon blob and the otheras a green spiral.
Previously, scientists believed the ring marked the outermost edge ofthe galaxy, but the latest GALEX observations detect a faint disk, notvisible in this image, that extends to twice the diameter of the ring. 欣赏一下
支持 这图很眼熟，真像水母 支持下::070821_09.jpg::
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