Anne’s Image of the Day: elliptical galaxy IC 1101
read more at Anne’s Astronomy News http://annesastronomynews.com/
August 16, 2013
IC 1101, the Largest Known Galaxy
Image Credit: David A. Aguilar (CfA)
IC 1101 is a supergiant elliptical galaxy of approximately 6 million light-years across, what makes it the largest known galaxy (as of 2013). It lies about 1.07 billion light-years away from Earth in the constellation of Virgo (the Virgin), while it is speeding away from us at roughly 23,370 kilometers per second.
Made up of more than 100 trillion stars (for comparison, our Milky Way has about 300 billion stars), this galaxy is the extremely bright object at the center of Abell 2029, a massive cluster of thousands of galaxies. Being one of the most luminous galaxies ever seen, IC 1101 emits more than one quarter of the total light from this galaxy cluster.
IC 1101 is more than 50 times the size of the Milky Way (which is some 100,000–120,000 light-years across) and 2,000 times as massive. If it were in place of the Milky Way galaxy, it would swallow up the Magellanic Clouds, the Andromeda Galaxy, and the Triangulum Galaxy. IC 1101 owes its size to many collisions of smaller galaxies about the size of the Milky Way and Andromeda galaxies.
This huge galaxy is giving birth to very few new stars. Unless it continues to collide and join with other younger galaxies, IC 1101 will eventually fade away.
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Source: http://annesastronomynews.com/annes-image-of-the-day-elliptical-galaxy-ic-1101/
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