[yt-users] Velocity dispersion profile
Jun-Hwan Choi
jhchoi at pa.uky.edu
Wed Feb 29 08:00:50 PST 2012
Hi YT users,
I would like to make a (spherical and/or cylindrical) profile of the
velocity dispersion.
In order to do so, I need to compute the mean velocity (BulkVelocity)
for a given shell (or ring), and pass this value to newly defined
velocity dispersion field, and then make a profile for the velocity
dispersion field.
Is there a particular way in yt to handle this?
Junhwan
P.S.: A few weeks ago I posted a similar question and Matt gave me a
following hint.
@derived_field(name = "deltaLocalCircularVelocity")
def delta_LocalCircularVelocity(field, data):
fn, x, cv = data.get_field_parameter("local_circular_velocity")
cv0 = na.interp(data[fn].ravel(), x, cv)
cv0 = cv0.reshape(data[fn].shape)
delta_cv = cv0 - data["LocalCircularVelocity"]
return delta_cv
You'll need to do something like this on the data object from which
you are getting your data:
sp.set_field_parameter("local_circular_velocity",
(fn, prof[fn], prof["LocalCircularVelocity"]))
However, it does not work for me and it is also complicate to understand
and modify it.
--
--------------------------------------------------------------
Jun-Hwan Choi, Ph.D.
Department of Physics and Astronomy, University of Kentucky
Tel: (859) 897-6737 Fax: (859) 323-2846
Email: jhchoi at pa.uky.edu URL: http://www.pa.uky.edu/~jhchoi
--------------------------------------------------------------
More information about the yt-users
mailing list