美国国家航空航天局NASA每日一图(天文)-2017年7月14日

2017 July 14

NGC 4449: Close-up of a Small Galaxy
Image Credit & Copyright: Data - Hubble Legacy Archive, ESA, NASA;
Processing - Domingo Pestana Galvan, Raul Villaverde Fraile
Explanation: (xxxedit and linkxxx) Grand spiral galaxies often seem to get all the glory. Their young, blue star clusters and pink star forming regions along sweeping spiral arms are guaranteed to attract attention. But small irregular galaxies form stars too, like NGC 4449, about 12 million light-years distant. Less than 20,000 light-years across, the small island universe is similar in size, and often compared to our Milky Way's satellite galaxy, the Large Magellanic Cloud (LMC). This remarkable Hubble Space Telescope close-up of the well-studied galaxy was reprocessed to highlight the telltale reddish glow of hydrogen gas. The glow traces NGC 4449's widespread star forming regions, some even larger than those in the LMC, with enormous interstellar arcs and bubbles blown by short-lived, massive stars. NGC 4449 is a member of a group of galaxies found in the constellation Canes Venatici. It also holds the distinction of being the first dwarf galaxy with an identified tidal star stream.

2017年7月14日

NGC 4449:小星系的特写
图像信用与版权:数据 - 哈勃遗留档案,欧空局,美国航空航天局;
加工 - Domingo Pestana Galvan,Raul Villaverde Fraile
说明:(xxxedit和linkxxx)大螺旋星系通常似乎得到了所有的荣耀。他们年轻的蓝色星团和粉红色星形成区域沿着螺旋臂扫过,保证引起关注。但是小型不规则星系也是像星座太阳星座一样,像NGC 4449,远远超过了1200万光年。小岛宇宙小于20,000光年,尺寸相似,经常与银河系的大麦哲伦云(LMC)相比。这个杰出的哈勃太空望远镜特写的研究良好的星系被重新处理,以突出显示氢气的红色辉光。发光痕迹NGC 4449的广泛的星形成区域,一些甚至比LMC中的那些,具有巨大的星际弧和泡沫,由短命的巨大的星星吹起。 NGC 4449是星座Canes Venatici中发现的一组星系的成员。它也是区分为第一个矮星系与一个确定的潮汐星流。

 

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