Hi Andrew,

I can’t answer your yt question, but for your particular need, I would just identify the halo you want at higher z, get some ids for some of the star particles and then see where those star particles are at lower z. They will almost certainly all be in the same halo. You really don’t need the extra complexity of merger trees for what you want to do.

Ari


On July 17, 2020 at 12:01:28 PM, yt-users-request@python.org (yt-users-request@python.org) wrote:

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Today's Topics:

1. Building Merger Trees with treefarm (Andrew Emerick)


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Date: Thu, 16 Jul 2020 21:30:12 -0700
From: Andrew Emerick <aemerick11@gmail.com>
Subject: [yt-users] Building Merger Trees with treefarm
To: Discussion of the yt analysis package <yt-users@python.org>
Message-ID:
<CAOo4WKK5Sidb=U6Q2p==LWQKBKQWKw++_cUsM1HkgjbD_tBrPw@mail.gmail.com>
Content-Type: multipart/alternative;
boundary="0000000000008a765305aa9b9d49"

--0000000000008a765305aa9b9d49
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Hi all,

This is my first foray into doing halo finding / merger tree analysis so
forgive me if I'm just missing something simple. My goal is to be able to
identify a halo at lower-z that had specific properties at higher-z so I
can get its lagrangian volume at lower-z to build a nested zoom. (And I'm
assuming merger trees are the only / best way to identify the halo across
snapshots for this).

Anyway, I've been following the docs for yt_astro_analysis to build halo
catalogs for a series of datasets and just tried the example in treefarm to
build a merger tree, but I get an error. I'm using the last_yt3 changeset
of yt, am on the master branch of treefarm, and halos were generated using
rockstar-galaxies via master branch of yt_astro_analysis. And the datasets
are DM-only Enzo runs.

I get this error: https://urldefense.proofpoint.com/v2/url?u=http-3A__paste.yt-2Dproject.org_show_256_&d=DwICAg&c=pRW6ZPn_LDv0DnDIAK65Ad0CA4hBS-2mAmNa2_oHfF0&r=Iz-a3pUetj3nlisatROdXEcoPEMbDfdQOMwCX2NLxNY&m=v33IDUcsnoUWrkiEWlE28GD4qz-4NWOrP-yNWqol_9U&s=dQPxFMdHO6rrn3bSwHkHYwgt3HsDR7cmJT9Ns2raNno&e=

When running this (slightly modified from the example code):

https://urldefense.proofpoint.com/v2/url?u=http-3A__paste.yt-2Dproject.org_show_257_&d=DwICAg&c=pRW6ZPn_LDv0DnDIAK65Ad0CA4hBS-2mAmNa2_oHfF0&r=Iz-a3pUetj3nlisatROdXEcoPEMbDfdQOMwCX2NLxNY&m=v33IDUcsnoUWrkiEWlE28GD4qz-4NWOrP-yNWqol_9U&s=3_7kX-5wZoFwH59eHcIT44gE5UP5r54Oqz1TxnIKnm4&e=

Thanks for the help!!



Best,
Andrew
---
Pasadena Fellow in Theoretical Astrophysics
Carnegie Observatories
California Institute of Technology

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi all,<div><br></div><div>This is my first foray into doi=
ng halo finding / merger tree analysis so forgive me if I&#39;m just missin=
g something simple. My goal is to be able to identify a halo at lower-z tha=
t had specific properties at higher-z so I can get its lagrangian volume at=
lower-z to build a nested zoom. (And I&#39;m assuming merger trees are the=
only / best way to identify the halo across snapshots for this).</div><div=
><br></div><div>Anyway, I&#39;ve been following the docs for yt_astro_analy=
sis to build halo catalogs for a series of datasets and just tried the exam=
ple in treefarm to build a merger tree, but I get an error. I&#39;m using t=
he last_yt3 changeset of yt, am on the master branch of treefarm, and halos=
were generated using rockstar-galaxies via master branch of yt_astro_analy=
sis. And the datasets are DM-only Enzo runs.</div><div><br></div><div>I get=
this error:=C2=A0<a href=3D"https://urldefense.proofpoint.com/v2/url?u=http-3A__paste.yt-2Dproject.org_show_256_&d=DwICAg&c=pRW6ZPn_LDv0DnDIAK65Ad0CA4hBS-2mAmNa2_oHfF0&r=Iz-a3pUetj3nlisatROdXEcoPEMbDfdQOMwCX2NLxNY&m=v33IDUcsnoUWrkiEWlE28GD4qz-4NWOrP-yNWqol_9U&s=dQPxFMdHO6rrn3bSwHkHYwgt3HsDR7cmJT9Ns2raNno&e= ">https://urldefense.proofpoint.com/v2/url?u=http-3A__-3D&d=DwICAg&c=pRW6ZPn_LDv0DnDIAK65Ad0CA4hBS-2mAmNa2_oHfF0&r=Iz-a3pUetj3nlisatROdXEcoPEMbDfdQOMwCX2NLxNY&m=v33IDUcsnoUWrkiEWlE28GD4qz-4NWOrP-yNWqol_9U&s=wTrVt7_c99mOq-Nwl6-0Xe60vX4vWM6lN4QMfXi7cks&e=
paste.yt-project.org/show/256/</a></div><div><br></div><div>When running th=
is (slightly modified from the example code):=C2=A0</div><div><br></div><di=
v><a href=3D"https://urldefense.proofpoint.com/v2/url?u=http-3A__paste.yt-2Dproject.org_show_257_&d=DwICAg&c=pRW6ZPn_LDv0DnDIAK65Ad0CA4hBS-2mAmNa2_oHfF0&r=Iz-a3pUetj3nlisatROdXEcoPEMbDfdQOMwCX2NLxNY&m=v33IDUcsnoUWrkiEWlE28GD4qz-4NWOrP-yNWqol_9U&s=3_7kX-5wZoFwH59eHcIT44gE5UP5r54Oqz1TxnIKnm4&e= ">https://urldefense.proofpoint.com/v2/url?u=http-3A__paste.yt-2Dproject-3D&d=DwICAg&c=pRW6ZPn_LDv0DnDIAK65Ad0CA4hBS-2mAmNa2_oHfF0&r=Iz-a3pUetj3nlisatROdXEcoPEMbDfdQOMwCX2NLxNY&m=v33IDUcsnoUWrkiEWlE28GD4qz-4NWOrP-yNWqol_9U&s=bnGBuoTfdaLKJezmz92aZuwMcOvOrxSZZRERAWmTGOk&e=
.org/show/257/</a><br></div><div><br></div><div>Thanks for the help!!</div>=
<div><br></div><div><br></div><div><br></div><div>Best,</div><div>Andrew</d=
iv><div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"g=
mail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"ltr"><di=
v style=3D"font-size:small;font-family:arial">---</div><div style=3D"font-s=
ize:small;font-family:arial"><div style=3D"font-family:Arial,Helvetica,sans=
-serif"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div style=3D"fo=
nt-family:arial">Pasadena Fellow in Theoretical Astrophysics</div><div styl=
e=3D"font-family:arial">Carnegie Observatories</div><div style=3D"font-fami=
ly:arial">California Institute of Technology</div></div></div></div></div><=
/div></div></div></div></div></div></div></div></div>

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