金牛座蟹状星云
[img=1273,1280]http://www.eso.org/gallery/d/4445-2/phot-40f-99.jpg[/img]This photo shows a three colour composite of the well-known Crab Nebula (also known as "Messier 1" ), as observed with the FORS2 instrument in imaging mode in the morning of November 10, 1999. It is the remnant of a supernova explosion at a distance of about 6,000 light-years, observed almost 1000 years ago, in the year 1054. It contains a neutron star near its center that spins 30 times per second around its axis (see below). PR Photo 40g/99 is an enlargement of a smaller area. More information on the Crab Nebula and its pulsar is available on the web, e.g. at a dedicated website for Messier objects .In this picture, the green light is predominantly produced by hydrogen emission from material ejected by the star that exploded. The blue light is predominantly emitted by very high-energy ("relativistic") electrons that spiral in a large-scale magnetic field (so-called syncrotron emission ). It is believed that these electrons are continuously accelerated and ejected by the rapidly spinning neutron star at the centre of the nebula and which is the remnant core of the exploded star. This pulsar has been identified with the lower/right of the two close stars near the geometric center of the nebula, immediately left of the small arc-like feature, best seen in PR Photo 40g/99 .Technical information : Photo 40f/99 is based on a composite of three images taken through three different optical filters: B (429 nm; FWHM 88 nm; 5 min; here rendered as blue), R (657 nm; FWHM 150 nm; 1 min; green) and S II (673 nm; FWHM 6 nm; 5 min; red) during periods of 0.65 arcsec (R, S II) and 0.80 (B) seeing, respectively. The field shown measures 6.8 x 6.8 arcmin and the images were recorded in frames of 2048 x 2048 pixels, each measuring 0.2 arcsec. The Full Resolution version shows the original pixels. North is up; East is left.
阀门1
**** 作者被禁止或删除 内容自动屏蔽 **** KB的颜色::070821_11.jpg:: 这就是中国古代发现的那颗超新星爆炸的残迹啊...::070821_02.jpg:: ::070821_18.jpg:: 古代都能用肉眼看得到,现代是什么情况?证明了什么呢?证明了在古代,这颗超新星的亮度比现在还要亮! 这图应该发过的!!::42:: ::42:: ::42:: [quote]原帖由 [i]小海螺[/i] 于 2008-8-28 14:36 发表 [url=http://www.astronomy.com.cn/bbs/redirect.php?goto=findpost&pid=1005797&ptid=95993][img]http://www.astronomy.com.cn/bbs/images/common/back.gif[/img][/url]
::070821_18.jpg:: 古代都能用肉眼看得到,现代是什么情况?
证明了什么呢?证明了在古代,这颗超新星的亮度比现在还要亮! [/quote]
那时候刚爆炸肯定比现在亮很多倍吧~~~~ [quote]原帖由 [i]星空天使[/i] 于 2008-8-28 22:01 发表 [url=http://www.astronomy.com.cn/bbs/redirect.php?goto=findpost&pid=1006092&ptid=95993][img]http://www.astronomy.com.cn/bbs/images/common/back.gif[/img][/url]
那时候刚爆炸肯定比现在亮很多倍吧~~~~ [/quote]
不知道有没有具体的爆发时间?
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