Anne’s Picture of the Day: Interacting Galaxies NGC 7753 & 7752
read more at Anne’s Astronomy News http://annesastronomynews.com/
April 7, 2013
NGC 7753 and NGC 7752, a pair of interacting galaxies
Image Credit & Copyright: Adam Block/Mount Lemmon SkyCenter/University of Arizona
(http://skycenter.arizona.edu/gallery)
NGC 7753 and NGC 7752 are a pair of interacting galaxies located approximately 272 million light-years away from Earth in the northern constellation of Pegasus. They are speeding away from us at roughly 5168 and 5072 kilometers per second respectively. Together they are also known as Arp 86.
The name “Arp 86″ derives from being included in Arp’s Atlas of Peculiar Galaxies, a catalog of 338 peculiar galaxies, drawn up by Halton Arp in the years from 1962 through 1967 and published by the California Institute of Technology.
NGC 7753 is the large, primary galaxy. It is a barred spiral galaxy of some 218 thousand light-years across, about twice the size of our Milky Way galaxy, and probably ten times as massive. It has a small nucleus and a small bar. Its satellite galaxy, NGC 7752, is a barred lenticular galaxy of about 55 thousand light-years across that is apparently attached to one of NGC 7753′s spiral arms. The pair is very similar to the famous Whirlpool Galaxy (M51A) and its satellite NGC 5195 (M51B).
Both NGC 7753 and NGC 7752 show signs of recent episodes of star formation. The small galaxy has most likely made a close passage to its larger neighbor in its orbit. Now, it appears that the highly active galaxy core of NGC 7752 is pulling gas and dust away from the larger galaxy’s outer arm. NGC 7752 will either be flung out into the inter-galactic space or, more likely, it will eventually be consumed by NGC 7753.
Three supernovae were witnessed in NGC 7753: on January 2, 2006 the supernova SN 2006A; on May 9, 2006 a Type Ia supernova, called SN 2006ch and very recently, on January 25, 2013, the supernova SN 2013Q.
n/a
2013-04-07 08:34:55
Source: http://annesastronomynews.com/annes-picture-of-the-day-interacting-galaxies-ngc-7753-7752/
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