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M94 Spiral Galaxy & Outer Ring

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#1 astrosirius



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Posted 03 March 2017 - 09:45 AM

Hello to everyone,


Here you have my last photo of the M94 Spiral Galaxy including the Outer Ring.


Hope you liked.


Best regards



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#2 MarkS



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Posted 08 March 2017 - 01:05 PM

Hi Lluis,


I haven't seen the outer ring like this before.


Thanks for showing this - too far north for me!



#3 LaCebra



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Posted 09 March 2017 - 04:06 AM

Hi Mark,


I looked, too, for the origin of this bluish ring... ???




"M94 contains both an inner ring with a diameter of 70 arcseconds and an outer ring with a diameter of 600 arcseconds. These rings appear to form at resonance locations within the disk of the galaxy. The inner ring is the site of strong star formation activity and is sometimes referred to as a starburst ring. This star formation is fueled by gas that is dynamically driven into the ring by the inner oval-shaped bar-like structure.

A 2009 study conducted by an international team of astrophysicists revealed that the outer ring of M94 is not a closed stellar ring, as historically attributed in the literature, but a complex structure of spiral arms when viewed in mid-IR and UV. The study found that the outer disk of this galaxy is active. It contains approximately 23% of the galaxy's total stellar mass and contributes about 10% of the galaxy's new stars. In fact, the star formation rate of the outer disk is approximately two times greater than the inner disk because it is more efficient per unit of stellar mass.

There are several possible external events that could have led to the origin of M94's outer disk including the accretion of a satellite galaxy or the gravitational interaction with a nearby star system. However, further research found problems with each of these scenarios. Therefore, the report concludes that the inner disk of M94 is an oval distortion which led to the creation of this galaxy's peripheral disk."

Native tongue : French

Beginner : Spanish

Machine translation system : English :rolleyes: 


#4 afesan



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Posted 24 March 2017 - 01:01 PM

Great, Luis!!!: Soft image., nice details. Like it !!

Best regards:
Spag-Monfrague Remote Observatory

#5 astrosirius



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Posted 25 March 2017 - 06:01 AM

Hello Antonio,


Thank you my friend for your kindly comments. 


Take care!

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