Dear yt:
I have one simple question, but it bothers me these days.
I used the yt to analysis the "hdf5" files, which generated by
Gadget-2. These files have basic fields, like: ("PartType0", "*"),
("PartType1", "*") and ("all", "*"). Then I want to plot the density
map and temperature map, it seems need some derived fields, like:
("gas", "density") and ("gas", "temperature").
I'm curious about how the ("gas","temperature") was derived, so I
browsed a lots of documents on the Web, but found nothing. Please
see
http://yt-project.org/doc/reference/field_list.html?highlight=field%20list About the field of ('gas','temperature'), there is "No source
available" in "Field Source"!
In my data, the field ("PartType0","InternalEnergy") is provided by
me, and I think the temperature should calculated by Internal Energy
"E" with the function: k*T = (Gamma -1)*µ*mp*E, where k = 1.38E-16
erg/K is Boltzmann constant, Gamma = 5/3 for adiabat particles, μ =
0.6 is the corresponding mean molecular weight, and mp = 1.67E-24 g
is proton mass. But this result is about half of the value of
("gas","temperature").
So what you may know is why, which one is right? I need your help!
Thank you a lot, and happy new year!
Regard,
Dan
--
Dan Hu
=======================================
Department of Physics, Shanghai Jiao Tong
University
800 Dongchuan Road, Minhang, Shanghai 200240, PRC
E-mail :
hudan_bazhaoyu@163.com hudan_bazhaoyu@sjtu.edu.cn =======================================