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[风景] NGC 2623: Merging Galaxies from Hubble

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微言 发表于 2018-1-11 00:19:49 | 显示全部楼层 |阅读模式
Where do stars form when galaxies collide? To help find out, astronomers imaged the nearby galaxy merger NGC 2623 in high resolution with the Hubble Space Telescope. Analysis of this and other Hubble images as well as images of NGC 2623 in infrared light by theSpitzer Space Telescope, in X-ray lightby XMM-Newton, and in ultraviolet lightby GALEX, indicate that two originallyspiral galaxies appear now to be greatly convolved and that their cores have unified into one active galactic nucleus(AGN). Star formation continues around this core near the featured image center, along the stretched outtidal tails visible on either side, and perhaps surprisingly, in an off-nuclear region on the upper left where clustersof bright blue stars appear. Galaxy collisions can take hundreds of millions of years and take several gravitationally destructive passes. NGC 2623, also known as Arp 243, spans about 50,000 light years and lies about 250 million light years away toward the constellation of the Crab (Cancer).Reconstructing the original galaxies and how galaxy mergers happen is often challenging, sometimes impossible, but generally important to understanding how our universe evolved.
Arp243_Hubble_3978.jpg
Image Copyright: Image Credit:ESA/Hubble & NASA

【Divyajyoti Sahoo分享】
小微瑾言,看了,也就明白了
!jz_fbzt! 快速回复 !jz_sctz! !jz_fhlb!
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