Pascal J. Elahi
Hunting for galaxies and halos in simulations with VELOCIraptor
Elahi, Pascal J.; Cañas, Rodrigo; Poulton, Rhys J.J.; Tobar, Rodrigo J.; Willis, James S.; Lagos, Claudia del P.; Power, Chris; Robotham, Aaron S.G.
Authors
Rodrigo Cañas
Rhys J.J. Poulton
Rodrigo J. Tobar
James S. Willis
Claudia del P. Lagos
Chris Power
Aaron S.G. Robotham
Abstract
We present VELOCIraptor, a massively parallel galaxy/(sub)halo finder that is also capable of robustly identifying tidally disrupted objects and separate stellar halos from galaxies. The code is written in C++11, use the Message Passing Interface (MPI) and OpenMP Application Programming Interface (API) for parallelisation, and includes python tools to read/manipulate the data products produced. We demonstrate the power of the VELOCIraptor (sub)halo finder, showing how it can identify subhalos deep within the host that have negligible density contrasts to their parent halo. We find a subhalo mass-radial distance dependence: large subhalos with mass ratios of ≳10−2 are more common in the central regions than smaller subhalos, a result of dynamical friction and low tidal mass loss rates. This dependence is completely absent in (sub)halo finders in common use, which generally search for substructure in configuration space, yet is present in codes that track particles belonging to halos as they fall into other halos, such as hbt+. VELOCIraptor largely reproduces the dependence seen without tracking, finding a similar radial dependence to hbt+ in well-resolved halos from our limited resolution fiducial simulation.
Citation
Elahi, P. J., Cañas, R., Poulton, R. J., Tobar, R. J., Willis, J. S., Lagos, C. D. P., …Robotham, A. S. (2019). Hunting for galaxies and halos in simulations with VELOCIraptor. Publications of the Astronomical Society of Australia, 36, Article e021. https://doi.org/10.1017/pasa.2019.12
Journal Article Type | Article |
---|---|
Online Publication Date | Jan 1, 2019 |
Publication Date | Jan 30, 2019 |
Deposit Date | Aug 2, 2019 |
Publicly Available Date | Mar 28, 2024 |
Journal | Publications of the Astronomical Society of Australia |
Print ISSN | 1323-3580 |
Electronic ISSN | 1448-6083 |
Publisher | Cambridge University Press |
Peer Reviewed | Peer Reviewed |
Volume | 36 |
Article Number | e021 |
DOI | https://doi.org/10.1017/pasa.2019.12 |
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Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
This article has been published in a revised form in Publications of the Astronomical Society of Australia [http://doi.org/10.1017/pasa.2019.12]. This version is published under a Creative Commons CC-BY-NC-ND. No commercial re-distribution or re-use allowed. Derivative works cannot be distributed. © Astronomical Society of Australia 2019.
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