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Climbing halo merger trees with TreeFrog

Published online by Cambridge University Press:  05 August 2019

Pascal J. Elahi Open the ORCID record for Pascal J. Elahi [Opens in a new window] ,
Rhys J. J. Poulton Open the ORCID record for Rhys J. J. Poulton [Opens in a new window] ,
Rodrigo J. Tobar ,
Rodrigo Cañas ,
Claudia del P. Lagos ,
Chris Power Open the ORCID record for Chris Power [Opens in a new window]  and
Aaron S. G. Robotham
Pascal J. Elahi*
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), UWA Node, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Rhys J. J. Poulton
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), UWA Node, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Rodrigo J. Tobar
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Rodrigo Cañas
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), UWA Node, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Claudia del P. Lagos
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), UWA Node, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Chris Power
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), UWA Node, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Aaron S. G. Robotham
Affiliation:
International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
*
Author for correspondence: Pascal J. Elahi, E-mail: pascal.elahi@icrar.org
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Abstract

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We present TreeFrog, a massively parallel halo merger tree builder that is capable comparing different halo catalogues and producing halo merger trees. The code is written in c++11, use the MPI and OpenMP API’s for parallelisation, and includes python tools to read/manipulate the data products produced. The code correlates binding energy sorted particle ID lists between halo catalogues, determining optimal descendant/progenitor matches using multiple snapshots, a merit function that maximises the number of shared particles using pseudo-radial moments, and a scheme for correcting halo merger tree pathologies. Focusing on VELOCIraptor catalogues for this work, we demonstrate how searching multiple snapshots spanning a dynamical time significantly reduces the number of stranded halos, those lacking a descendant or a progenitor, critically correcting poorly resolved halos. We present a new merit function that improves the distinction between primary and secondary progenitors, reducing tree pathologies. We find FOF accretion rates and merger rates show similar mass ratio dependence. The model merger rates from Poole, et al. [2017, 472, 3659] agree with the measured net growth of halos through mergers.

Keywords

dark mattermethods: numericalgalaxies: evolutiongalaxies: halos
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 36 , 2019 , e028
Copyright
Copyright © Astronomical Society of Australia 2019 

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