Celestial hemisphere:  Northern  ·  Constellation: Aries (Ari)  ·  Contains:  IC 195  ·  IC 196
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Arp 290, Gary Imm
Arp 290, Gary Imm

Arp 290

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Arp 290, Gary Imm
Arp 290, Gary Imm

Arp 290

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Description

This Astrobin Debut Object is a pair of magnitude 14 galaxies both located 160 million light years away in the constellation of Aries at a declination of +15 degrees.  In his Arp catalog, Dr. Arp classified this object into the category of Double Galaxies – Wind Effects.

The large spiral, IC 195, spans 2 arc-minutes in our apparent view, which corresponds to a diameter of 100,000 light years.  The outer disk of this galaxy has been severely disturbed in what Dr. Arp refers to as “wind effects”.  What is causing this disturbance?

The most likely candidate is the galaxy immediately below and left, IC 196.  This small spiral is located at the same distance as IC 195 and has a diameter of 60,000 light years.  The big mystery here is why the larger galaxy is disturbed while the smaller galaxy is not.  Is it possible for a smaller galaxy to cause disturbance of a larger galaxy, without getting disturbed itself?  I don’t know.

The very small spiral above and right of IC196 is LEDA 212903, located much further away at 440 million light years away.  It is 60,000 light years in diameter.  The two tiny spirals to the upper left of IC196 are even further distant, at 800 million light years away.

The face-on spiral galaxy at the bottom of the page is located 1.7 billion light years away and is 200,000 light years in diameter.  That is one big and bright spiral!

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