Astronomy Picture of the Day——21世纪的M101星系

21st Century M101 
Image Credit: NASA, ESA, CXC, JPL - Caltech, STScI

Explanation: One of the last entries in Charles Messier's famous catalog, big, beautiful spiral galaxy M101 is definitely not one of the least. About 170,000 light-years across, this galaxy is enormous, almost twice the size of our own Milky Way Galaxy. M101 was also one of the original spiral nebulae observed with Lord Rosse's large 19th century telescope, the Leviathan of Parsonstown. In contrast, this multiwavelength view of the large island universe is a composite of images recorded by space-based telescopes in the 21st century. Color coded from X-rays to infrared wavelengths (high to low energies), the image data was taken from the Chandra X-ray Observatory (purple), the Galaxy Evolution Explorer (blue),Hubble Space Telescope(yellow), and the Spitzer Space Telescope(red). While the X-ray data trace the location of multimillion degree gas around M101's exploded stars and neutron star and black hole binary star systems, the lower energy data follow the stars and dust that define M101's grand spiral arms. Also known as the Pinwheel Galaxy, M101 lies within the boundaries of the northern constellation Ursa Major, about 25 million light-years away.

21世纪的M101星系

美丽的巨大旋涡星系M101是著名的梅西耶星表中的最后一个天体，但它绝对不是最小的一个。它的直径约 17万光年，非常庞大，几乎是银河系大小的二倍。M101也是由罗斯伯爵在19世纪建造的大型望远镜最早发现的旋涡星云之一。相比之下，这幅巨大的多波段影像是21世纪由多台太空望远镜所拍摄的照片组合而成。这幅按颜色编码的影像在能量上从高到低覆盖了X射线到红外波长的所有波段，来自钱德拉x射线天文台、星系演化探测器、哈勃太空望远镜和斯皮策太空望远镜的图像数据分别呈现出紫、蓝、黄和红色。当x射线数据追踪到M101内的爆炸恒星、中子星和黑洞双星系统周围数百万度气体的位置时，低能量波段的数据则追踪呈现了M101庞大旋臂上的恒星和尘埃。M101也被称为风车星系，位于北天的大熊座内，距离地球约2500万光年。

高清原图地址：

https://apod.nasa.gov/apod/image/1911/M101_nasaMultiW.jpg

近期文章：

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