[Mentor's Note: Post moved to its own thread from here: https://www.physicsforums.com/threads/find-radial-velocity-of-galaxies.813006/] [Broken] I suppose this thread might be an appropriate place for me to add my request for assistance on the question of rotating galactic systems. I am interested in the problem of the observed asymmetry in left side/right side rotational velocity of curves of spirals and barred galaxies, but I cannot seem to find any thing that provides a general/comprehensive treatment of the subject, or even an introductory report on the nature and scope of the analytical issues involved. The advanced papers I have read on the subject are highly focused and, it appears to me, do not fully explicate the underlying issues involved in interpretating the "data". For example, I have canvassed probably 75 papers dealing with the kinematics and asymmetric velocity curves of these systems and not one of them identifies the adjustments required for interpreting the rotational velocity data on account of the Hubble shift. I have ordered Binney and Merrifield as it appears to be the go to resource in the field, but, I find it very hard to believe that there isnt a generally available resource that is addressed to the specific problem of sorting out the data evidencing the asymmetry in the rotational velocities of these systems. At this point, I am specifically interested in the modeling of the effects of the Hubble Flow on the interpretation of the Left/Right rotation curves of these galaxies across the scale of low to high z systems. Any assistance in pointing me to helpful sources/resources addressing this subject or the broader subject of asymmetric kinematics (exclusive of "lopsided" systems--spatial asymmetry of mass distribution), of these systems would be much appreciated.