[yt-users] TotalMass

[Yong Zheng]

Hi,

I am trying to calculate the total mass of an object, but found the result
slightly different when I use different methods. To explain the question, I
use the test data set in $YT_DEST/src/yt-hg/tests:

pf = load("DD0010/moving7_0010")

dd = pf.h.all_data()


then dd["TotalMassMsun"].sum() returns 1.25198e12 Msun, but
dd.quantities["TotalMass"]() returns 1.22517e12 Msun

The document says that the first method returns the total mass of baryon
and dark matter, while the second returns the total mass of baryon and
particles. I wonder what is the difference here? In this data, there is
only type of particle (particle_type = 1), so supposedly particle mass
should represent the dark matter mass, right?

Thanks for your help!
Yong
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