Hi Ari Good point. I was originally running DM only though and am using my individual star SF routine for the full runs so would have to toy around with a different SF routine to make that reasonable. But ya that’s potentially easier than messing around with the merger trees. Thanks for the suggestion. Best Andrew On Fri, Jul 17, 2020 at 9:17 AM Ari Maller wrote:

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 Subject: [yt-users] Building Merger Trees with treefarm To: Discussion of the yt analysis package Message-ID: Content-Type: multipart/alternative; boundary="0000000000008a765305aa9b9d49"

--0000000000008a765305aa9b9d49 Content-Type: text/plain; charset="UTF-8"

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

--0000000000008a765305aa9b9d49 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

...

<br></div><div>Anyway, I've been following the docs for yt_astro_analy= sis to build halo catalogs for a series of datasets and just tried the exam=

Hi all,<div><br></div><div>This is my first foray into doi= ng halo finding / merger tree analysis so forgive me if I'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'm assuming merger trees are the= only / best way to identify the halo across snapshots for this).</div>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>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

iv><div><div>

<div>

---</div>

Pasadena Fellow in Theoretical Astrophysics</div>

Carnegie Observatories</div>

California Institute of Technology</div></div></div></div></div><= /div></div></div></div></div></div></div></div></div>

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