[yt-users] HaloMassFunction

[Nathan Goldbaum]

On Mon, May 23, 2016 at 3:43 PM, Io Odderskov <io.odderskov at gmail.com>
wrote:

> Dear Yt-users.
>
> I have just started used Yt, which I find to be very useful. However, I am
> having trouble converting the units of the output of the
> HaloMassFcn-function to match other data sets.
>
> I have tried comparing the Tinker 2008 fitting function produced by
> HaloMassFcn to the halo mass function from the Halo Finder Comparison
> Project (https://arxiv.org/pdf/1104.0949v1.pdf) and to a halo catalogue
> from the DEUS consortium (http://www.deus-consortium.org/deuvo/#download).
> In these cases, the halo masses are given in Msun/h, and the cumulative
> halo number density in h^3/Mpc^3. According to the Yt-documentation, the
> masses output by the HaloMassFcn-function should be in Msun, and the number
> densities in 1/Mpc^3. To convert to Msun/h and h^3/Mpc^3, I multiply the
> masses by h, and divide the number densities with h^3. In the attached
> figure, this corresponds to the line labelled "Tinker2008 - masses
> multiplied by h", which does not match the other data sets very well. If I
> instead divide the masses by h, I get the line labelled Tinker2008 - masses
> divided by h", which looks much better. But I really can't see how to
> justify this conversion.
>

To convert to Msun/h, you're trying to multiply by h? I don't think that's
right --- dividing by h is the correct thing to do.


>
> I hope you can help me figure out what I'm doing wrong :-)
> Thanks in advance!
>
> Best regards, Io.
>
> script: http://paste.yt-project.org/show/6530/
> image http://imgur.com/otWW3QJ
>
> version:
>
>   Version = 3.2.3
>   Changeset = bdea84d95099 (stable) @
>
> P.S. When I tried to do "yt upload_image", I got a 404 error. Perhaps
> imgur changed their API?
>

Yeah, imgur changed their API. This is fixed in the development branch of
yt but hasn't been backported to the stable branch. Perhaps we should do a
3.2.4 release given than 3.3 is taking a bit longer than anticipated to
release.


>
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>
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