could this be a rotating disk that is reddish one side and blue-ish the opposing side due to the doppler effect ??
by Budgieye moderator
Redshift / Blueshift can be detected in rotating galaxies, but it takes more sensitive equipment than this to do a good job for such distant galaxies.. See these Galaxy Zoo Forum posts for descriptions of nearby galaxies.
http://www.galaxyzooforum.org/index.php?topic=277867.0 Saturday, 12 June 2010: Hydrogen on the radio by EigenState
Can the z's indicate galactic spin? by nerthus and NGC3314 http://www.galaxyzooforum.org/index.php?topic=9436.msg95553;topicseen#msg95553 a good try in SDSS, though the images are now removed.
Re: Wednesday, 12th October, 2011: Kinematically Confirmed Polar Ring Galaxies by Jean Tate http://www.galaxyzooforum.org/index.php?topic=279519.msg563848#msg563848
All galaxies rotate. Some rotate in an organized way, such as spirals. Some in a more chaotic way, such as ellipticals and irregulars.
The blue in the center is due to the bluer light coming from an active nucleus.