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Title:
Hunting for galaxies and halos in simulations with VELOCIraptor
Authors:
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.
Affiliation:
AA(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia 0000-0002-6154-7224), AB(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia), AC(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia 0000-0003-2049-520X), AD(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia), AF(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia), AG(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia 0000-0002-4003-0904), AH(International Centre for Radio Astronomy Research, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia)
Publication:
Publications of the Astronomical Society of Australia, Volume 36, id. e021 (PASA Homepage)
Publication Date:
05/2019
Origin:
CUP
Astronomy Keywords:
dark matter, galaxies: evolution, galaxies: halos, methods: numerical
Abstract Copyright:
2019: Astronomical Society of Australia
DOI:
10.1017/pasa.2019.12
Bibliographic Code:
2019PASA...36...21E

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.
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