Cień dnia (1): Fwd: Hubble's View of the Polar Ring of Arp 230

sobota, 31 stycznia 2015

Fwd: Hubble's View of the Polar Ring of Arp 230

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Date: Fri, Jan 30, 2015 at 6:43 PM
Subject: Hubble's View of the Polar Ring of Arp 230
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Hubble's View of the Polar Ring of Arp 230

01/30/2015 11:00 AM EST

This image shows Arp 230, also known as IC 51, observed by the NASA/ESA Hubble Space Telescope. Arp 230 is a galaxy of an uncommon or peculiar shape, and is therefore part of the Atlas of Peculiar Galaxies produced by Halton Arp. Its irregular shape is thought to be the result of a violent collision with another galaxy sometime in the past. The collision could also be held responsible for the formation of the galaxy's polar ring. The outer ring surrounding the galaxy consists of gas and stars and rotates over the poles of the galaxy. It is thought that the orbit of the smaller of the two galaxies that created Arp 230 was perpendicular to the disk of the second, larger galaxy when they collided. In the process of merging the smaller galaxy would have been ripped apart and may have formed the polar ring structure astronomers can observe today. Arp 230 is quite small for a lenticular galaxy, so the two original galaxies forming it must both have been smaller than the Milky Way. A lenticular galaxy is a galaxy with a prominent central bulge and a disk, but no clear spiral arms. They are classified as intermediate between an elliptical galaxy and a spiral galaxy. European Space Agency Image Credit: ESA/Hubble & NASA, Acknowledgement: Flickr user Det58

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