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Image Details: NGC 4449

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NGC 4449

Object/Name: Caldwell 21 (UGC 7592, PGC40973, ZWG 216.005) Image Details:
Type: Galaxy - Irregular Barred Dwarf (IBm) Luminance:5.00 min. (14) – 70.00 min. 1x1
Constellation: Canes Venatici Red:5.00 min. (12) – 60.00 min. 1x1
RA: 12 hours 28.2 minutes Green:5.00 min. (12) – 60.00 min. 1x1
Dec: +44 degreees 06 minutes Blue:5.00 min. (11) – 55.00 min. 1x1
Distance: 13.7 million light years Total Time:245 minutes
Magnitude: 9.6 mag   
Size: 5.1 x 5.1 arc minutes   
Imaging Dates: 21 - 3 April 2009   
Location: LightBuckets Observatory, Rodeo, NM, U.S.A.   
Telescope: RC Optical Systems 24 inch f/8 Carbon Truss Mount: RCOS equatorial fork
CCD: Apogee Alta U42 Filters: Astrodon 50 mm
Software Used:
  CCDStack Adobe Photoshop CS3
Kodak GEM noise suppression software Noel Carboni's Astronomy Tools for Photoshop
Focus Magic  
Detailed Information:
NGC 4449 (Caldwell 21) is an irregular dwarf galaxy member of the Canes Venaticorum group of galaxies. It is similar in size and appearance to our neighboring Large Magellanic Cloud. This galaxy plays a part in the history of astronomy because it was one of the objects that deceived Herschel into thinking that he had resolved &quot;nebula&quot; into stars. The clouded hourglass with clumped stellar filigree were misperceived to be resolved into stars, but telescope of the ninteenth century were not sufficiently powerful to permit such a resolution at the great distance this galaxy occupies from the Milky Way galaxy.<br /><br />NGC 4449 ia an active star-forming dwarf galaxy oriented at 43 degree angle away from face-on. The central bar region is composed of very old stars more than 5 million years in age. However the reddish regions are emitting light in the hydrogen alpha band because they are HII regions with embedded star formation. The bluish white regions are star clusters. These can be seen better in this close-up. NGC 4449 Closeup

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