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有声资料: 天文学家观测迄今为止发现最大的螺旋星系 (Earth & Sky)

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1# 大 中 小 发表于 2008-5-26 21:43  只看该作者

有声资料: 天文学家观测迄今为止发现最大的螺旋星系 (Earth & Sky)

http://www.astrob有声资料: 天文学家观测迄今为止发现最大的螺旋星系 (Earth & Sky)
The largest spiral galaxy known to astronomers is Malin 1. Its disk of stars measures 650,000 light-years across, several times the diameter of the disk of our Milky Way galaxy.


The largest spiral galaxy in the universe, Malin 1, shown here on the right measures 650,000 light years across. Malin 1 has a central bar-shaped arrangement of stars such as galaxy M58, shown left. (Images courtesy of NASA/Hubble)

Recently, a newly found image from the Hubble Space Telescope revealed that the central part of Malin 1 looks like an ordinary barred spiral galaxy, somewhat like our Milky Way. Aaron Barth of the University of California at Irvine found the image and identified the barred spiral structure of the galaxy’s core.
Malin 1 is so far away – 1.1 billion light-years from Earth – that it’s been hard for astronomers to glimpse small details about the galaxy. Its barred spiral core notwithstanding, Malin 1 remains a remarkable galaxy. No other galaxy has such an enormous disk, which extends far beyond the barred spiral core Barth discovered.
Unlike most galaxies, it’s isolated, with no other galaxy near it. It’s thought that’s why Malin 1 has been able to acquire gas and grow larger over time. Because the gas in this galaxy is so spread out, it gives birth to few new stars. And that’s why most of this galaxy has the appearance of a ghost.
Our thanks today toResearch Corporation, a foundation for the advancement of science.



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