M90 (Arp 76) and M89


Gregg Ruppel
 

Hi all

M90 and M89 are two large galaxies in Virgo.  M90, along with IC3583, make up Arp 76, a "spiral with small high surface brightness companion on arm".   Although these two are only about 100,000 LY apart, it is unclear whether they are truly interacting.  M90 is blue-shifted, approaching us while IC3583 is red-shifted, moving away.  M89 is a large, spherical elliptical that sports outer envelopes of dust and gas and a long tidal tail, suggesting some past interaction. An estimated 2000 globulars surround M89.

http://www.greggsastronomy.com/IMAGES/m90_89-LRGB.jpg

M90 (Arp 76), 1.3X crop:
http://www.greggsastronomy.com/IMAGES/m90-Arp-76-LRGBcrop.jpg

M89, 1.3X crop:
http://www.greggsastronomy.com/IMAGES/m89-LRGBcrop.jpg

Annotated version:
http://www.greggsastronomy.com/IMAGES/m90_89_LRGB_Annotated.jpg

LRGB, 10 hours total exposure from Dark Sky New Mexico

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Clear skies,

Gregg
Visit my astronomy & astrophotography site
http://www.greggsastronomy.com/

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