NGC 4449 a starbush galaxy

[elpajare]

Also Caldwell 21, this galaxy is similar in size and brightness, and often compared to, the Milky Way's satellite galaxy, the Large Magellanic Cloud (LMC). NGC 4449 has a general bar shape, also characteristic of the LMC, with scattered young blue star clusters.

Unlike the Large Magellanic Cloud, however, NGC 4449 is considered a starburst galaxy due to its high rate of star formation (twice the one of the LMC)^[4] and includes several massive and young star clusters, one of them in the galaxy's center.

Photos of the galaxy show the pinkish glow of atomic hydrogen gas, the telltale tracer of massive star forming regions.

NGC 4449 is surrounded by a large envelope of neutral hydrogen that extends over an area of 75 arc minutes (14 times larger than the optical diameter of the galaxy). The envelope shows distortions and irregularities likely caused by interactions with nearby galaxies. (Wikipedia)

 

NGC 4449 also Caldwell 21/ GX / CANES VENATICI/ EXPO= 20X15" stack/  FWHM=6,5/ ALTIT= 34º/  Moon=0

Skywatcher/f4 + ATIK Infinity + Infinity software