omega Centauri (and 47Tucanae)

omega Centauri (and 47Tucanae)



omega Centauri is one of the gems of the southern skies in the constellaton Centauri. It was originally thought to be a star by Ptolemy, a nebula by Halley in 1677, and finally a globular cluster by Herschel ~1830. omega Centauri is unusual and is considered to be a dwarf galaxy stripped of its outer stars due to a collision with our Milky Way. It is about 10 times larger than most globular clusters, contains several generations of stars, and may be harboring a black hole. Stars are moving very fast in the core, suggesting the presence of a black hole based upon HST and Gemini South data.
There is a wonderful, animated image on the ESA site zooming into omega Centauri at : It is a joy to watch.
The above image is ~ 40′ x 40′. Only unbinned RGB data were used at a plate scale of 0.65"/pixel. Registar counts 22,394 stars in the omega Centauri image.
Here is an interesting side-by-side comparison of 47Tucanae and omega Centauri, taken nights apart with the same system at MRO (click on link to enlarge; large file ~1.7MB)

Image Date: 05/11/2008
Details: Exposure Time: 110 min; 40 min B, 30 min R,G Astrodon Gen2
Camera: Apogee  U16M
Telescope: RC Optical  Carbon 12.5 inch f/9 Ritchey-Chretien
Mount: Software Bisque  Paramount ME

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