Tuesday, April 28, 2015

Great Bear orbs

This is well known galaxy pair in Great Bear constellation - M82 Cigar Galaxy and M81 Bode's Galaxy. Both placed about 12 million light years away are quite easy target for visual observing even through the binoculars. Messier 81 has been discovered by Johann Elert Bode in 1774. M81 galaxy is the largest member of M81 Group, a group of 34 galaxies located in Ursa Major. Gravitational interactions of M81 with M82 and NGC3077 (see http://astrojolo.blogspot.com/2014/03/great-bear-fuzzies.html) have stripped hydrogen gas away from all three galaxies, forming gaseous filamentary structures. The galaxies seems to be emerged in the delicate dust structures, these structures are known as Integrated Flux Nebula, and are placed in our Galaxy (see http://astrojolo.blogspot.com/2015/03/great-bears-fleece.html) that’s why the background does not seem to be quite flat. 
M82 galaxy was previuosly believed to be an irregular galaxy. In 2005 however, two symmetric spiral arms were discovered in near infrared images. 

M81 and M82 galaxy pair in Great Bear
There are also some distant worlds recorded in the image - the brighter one is 17.6mag and is placed about 9 billion light years away http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237663917349273644

The fainter has apparent magnitude 19.8 ans is 12 billion light years away http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237663787964825716

Distant quasars next to M81

Picture has been made with 8" newtonian and Atik383 camera. Total exposure time is 7.5h.

Clear skies!

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