APOD090701 天龙座的三个星系

http://apod.nasa.gov/apod/ap090701.html

2009 July 1
Three Galaxies in Draco

                               
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Credit & Copyright: Giovanni Benintende
Explanation:
This intriguing trio of galaxies is sometimes called the Draco Group, located in the northern constellation of (you guessed it) Draco. From left to right are edge-on spiral NGC 5981, elliptical galaxy NGC 5982, and face-on spiral NGC 5985 -- all within this single telescopic field of view spanning a little more than half the width of the full moon. While the group is far too small to be a galaxy cluster and has not been cataloged compact group, these galaxies all do lie roughly 100 million light-years from planet Earth. On close examination with spectrographs, the bright core of the striking face-on spiral NGC 5985 shows prominent emission in specific wavelengths of light, prompting astronomers to classify it as a Seyfert, a type of active galaxy. Not as well known as other tight groupings of galaxies, the contrast in visual appearance makes this triplet an attractive subject for astrophotographers. This impressively deep exposure of the region also reveals faint and even more distant background galaxies.

APOD大图，1600X1200
http://apod.nasa.gov/apod/image/0907/NGC5982_benintende_h.jpg

                               
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北京天文馆的翻译，简体的大家看起来方便点。如果前面的APOD大图比较慢，这个大图应该比较快。
http://www.bjp.org.cn/apod/today.htm

2009 年 07 月 01 日
天龙座内的星系

                               
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影像提供及版权：Giovanni Benintende
说明：
这迷人的星系三重奏有时候被称为天龙座星系群，位于北半球的天龙座内。从左到右分别是侧沿星系NGC 5981，椭圆星系NGC 5982以及正向旋涡星系NGC 5985，它们都位于这张单一的望远镜影像中，影像大约有满月的一半宽多些。而星系组相距很远而很难组成一个星系团，所以并没有被编录为一个紧密的星系群，这些星系大约位于距离地球1亿光年的地方。仔细检查摄谱仪，正向旋涡星系NGC 5985的明亮星核在光线的特殊波段下发出了显著的放射线，这提示了天文学家们把它归类为塞弗特星系，这是一类活跃星系。虽然不如其它紧密的星系团有名，但视觉的对照让这个三重奏成为吸引天文摄影师们的目标。这张令人影像深刻的深空曝光影像还揭示了昏暗而更加遥远的背景星系。

拍摄以及后期处理方式是什么????????

谢谢
收下了!!!!

震撼啊，看看背景中那些数不尽的星系。。。。