Hi Reju, For the peculiar velocity plots, you'll have to use the constituent information calculated about each individual halo and construct your own plot; while we do have methods for creating plots with halo circles overlaid, the specific item you're noting isn't yet included. (It would be a *very* nice addition, however!) For finding the velocity, etc, that's all part of the standard halo output and halo profiler output: http://yt-project.org/docs/2.5/analysis_modules/running_halofinder.html bulk_velocity, total_mass, etc. The HaloProfiler would be a nice place to put the peculiar velocity plot, and note that the halo finding by itself does not filter based on virial parameter or radius, while the HaloProfiler does. http://yt-project.org/docs/2.5/analysis_modules/halo_profiling.html -Matt On Mon, Jul 8, 2013 at 2:01 AM, Reju Sam John <rejusamjohn@gmail.com> wrote:

Dear All,

Is there any methods to make peculiar velocity plots in yt? or any methods to plot or calculate mean (and mass weighted among all constituents) velocity of a halo, averaged within the virial radius?

Thank you for any help you can provide and for considering my request.. -- Reju Sam John

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