[yt-users] comoving distance a_box

[Huanqing]

Hi all,

I’m using yt to generate halo catalog. However, when I check the halos created by HaloCatalog function, I found the corresponding comoving unit uses the expansion factor of the universe rather than a_box. 

For example, My boxsize is 20cMpc/h, but if I use .in_units(‘Mpccm/h’), the halos are offset by some amount (see attached). I wonder if this is a bug in converting physical unit to comoving unit?

Thanks,
Huanqing

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