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Contains:  NGC 6946
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Fireworks galaxy - no guiding, 





    
        

            marsbymars
Fireworks galaxy - no guiding

Fireworks galaxy - no guiding

Technical card

Resolution: 1978x1500

Dates:Aug. 13, 2016

Frames: 217x180"

Integration: 10.8 hours

Avg. Moon age: 9.87 days

Avg. Moon phase: 75.26%

Astrometry.net job: 1203269

RA center: 308.718 degrees

DEC center: 60.155 degrees

Pixel scale: 0.484 arcsec/pixel

Orientation: -125.900 degrees

Field radius: 0.167 degrees

Locations: E-EYE, Fregenal de la Sierra, Spain

Description

NGC 6946 is called the “Fireworks Galaxy” because so many supernovae have been spotted there in the last hundred years. Actually, nine supernovae have been observed in the galaxy’s spiral arms. With this number of supernovae, NGC 6946 is leading the statistics, just one supernova more than follow-up galaxy the Southern Pinwheel (Messier 83). By comparison, the average rate for supernovae in the Milky Way is about 1 per century.

The center of the Fireworks galaxy is home to a nuclear starburst, in fact, this galaxy is undergoing a tremendous burst of star formation with no obvious cause. In many cases spirals light up when interacting with another galaxy, but this galaxy appears relatively isolated in space. An explanation for the high star formation rate is the recent accretion of many primordial low-mass neutral hydrogen clouds from the surrounding region.

This galaxy has an unusually large halo of neutral gas that extends out of the plane of the disk, rotating at a slower velocity than the disk. Extra-planar gas is a phenomenon peculiar to several other galaxies, including NGC 2403 and NGC 891, two galaxies with high rates of star formation. The phenomenon is likely due to a fountain effect where winds from high mass stars and supernovae blow gas out of the plane of the galaxy forming an extended gaseous halo structure.

Comments

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marsbymars
marsbymars
License: None (All rights reserved)
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            marsbymars
    Original
  • Fireworks galaxy - no guiding, 





    
        

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  • Final
    Fireworks galaxy - no guiding, 





    
        

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    C

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Sky plot

Histogram

Fireworks galaxy - no guiding, 





    
        

            marsbymars