NGC 5236 - Messier 83

Object: NGC 5236 The Southern Pinwheel Galaxy in the constellation Hydra at a distance of approximately 4.8 Mpc (15.6 Mly). It is a weakly barred spiral galaxy similar to our own, but about half as small, being only ~55 kly in diameter. Click image for full resolution.

Subimages L: 11 x 900 sec (2.75 hrs), Combined FWHM=1.9", Deconvolved FWHM=1.3"
Subimages RGB: 9/11/11 x 900 sec (2.25/2.75/2.75 hrs)
Scope: Planewave CDK20, EFL = 3420 mm
Mount: Software Bisque Paramount ME
Camera: Apogee U16M-D09F set to -30C
Guiding: Lodestar on MMOAG, ExpTime=0.1s, dithered
Other: Clement 3.5" Bellerophon focuser, Optec Pyxis 3" rotator, Apogee AFW50-10S filter wheel, Astrodon filters.
Acquisition and processing: MaxIm DL/CCD v5
Imaged during: March-May 2012
Imaged from: Arkaroola Remote Observatory in the Northern Flinders Ranges of South Australia

Blend of optical data recorded from ARO and far UV data recorded from the GALEX satellite. The purple blotches outside of the spiral arms reveal massive star formation regions beyond the optical disk. Some have optical counterparts visible in the ground based image. These are unlike the better known HII pink knots embedded in the spiral arms. There still is debate over the mechanism driving the extended UV disks.