Galaxy Pair in Coma Berenices

Uploaded 5/21/05

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 There are very few galaxies that display the structure that this one does. This is a "Plume" galaxy, a rare type of spiral that exhibits the following feature: Small ribs or vanes like a fan streaming off the inner spiral arms to the outer ones. They are very fine and delicate as seen here, well resolved along with a few small pink HII regions and the pastel blues of OB associations.

NGC4725, the main central galaxy seen here is a 10.1 magnitude SAB Peculiar type, rather large at 11 arcminutes in size. Look at the dark arm gap that winds nearly 180 degrees in the faint outer arm. That's why this galaxy is classed as peculiar, along with the plume structure.

As an added bonus, and one I was pleasantly surprised upon seeing is NGC4712 in the upper right corner. This 13.3 magnitude SA spiral shows some very interesting details in the arms including a well resolved spiral nature and OB associations. The HII regions are obviously sub arcsecond in size and not seen.

Several other galaxies litter the field. MAC 1250+2525 is actually inside the lower left arm as a white diffuse patch. It is 17th magnitude but a diminutive .3 arcminutes in size.

Instrument: 12.5" f/5 Home made Newtonian Platform: Astrophysics 1200 QMD CCD Camera: SBIG 10XME NABG with Enhanced Cooling Guider: SBIG ST4 Exposure: LRGB = 80:20:20:20 (RGB Binned 2x2) RGB Combine Ratio: 1: 1.05: 1.11 (G2V Calibrated) Filters: AstroDon RGB Tricolor Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing FWHM = 6.3 arcsec (Maxim DL - 10min subframe), Transparency 8/10 Outside Temperature: 15 C CCD Temperature: -20 C Processing Tools: Maxim DL, Photoshop, PixInsight, RW Debloomer. HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS


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