Angular momentum evolution in dark matter haloes: a study of the Bolshoi and Millennium simulations

Sergio Contreras, N. Padilla, C. D. P. Lagos

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We use three different cosmological dark matter simulations to study how the orientation of the angular momentum (AM) vector in dark matter haloes evolve with time. We find that haloes in this kind of simulations are constantly affected by a spurious change of mass, which translates into an artificial change in the orientation of the AM. After removing the haloes affected by artificial mass change, we found that the change in the orientation of the AM vector is correlated with time. The change in its angle and direction (i.e. the angle subtended by the AM vector in two consecutive time-steps) that affect the AM vector has a dependence on the change of mass that affects a halo, the time elapsed in which the change of mass occurs and the halo mass. We create a Monte Carlo simulation that reproduces the change of angle and direction of the AM vector. We reproduce the angular separation of the AM vector since a lookback time of 8.5 Gyr to today (alpha) with an accuracy of approximately 0.05 in cos(alpha). We are releasing this Monte Carlo simulation together with this publication. We also create a Monte Carlo simulation that reproduces the change of the AM modulus. We find that haloes in denser environments display the most dramatic evolution in their AM direction, as well as haloes with a lower specific AM modulus. These relations could be used to improve the way we follow the AM vector in low-resolution simulations.

Original languageEnglish
Pages (from-to)4992-5003
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue number4
DOIs
Publication statusPublished - Dec 2017

Cite this

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title = "Angular momentum evolution in dark matter haloes: a study of the Bolshoi and Millennium simulations",
abstract = "We use three different cosmological dark matter simulations to study how the orientation of the angular momentum (AM) vector in dark matter haloes evolve with time. We find that haloes in this kind of simulations are constantly affected by a spurious change of mass, which translates into an artificial change in the orientation of the AM. After removing the haloes affected by artificial mass change, we found that the change in the orientation of the AM vector is correlated with time. The change in its angle and direction (i.e. the angle subtended by the AM vector in two consecutive time-steps) that affect the AM vector has a dependence on the change of mass that affects a halo, the time elapsed in which the change of mass occurs and the halo mass. We create a Monte Carlo simulation that reproduces the change of angle and direction of the AM vector. We reproduce the angular separation of the AM vector since a lookback time of 8.5 Gyr to today (alpha) with an accuracy of approximately 0.05 in cos(alpha). We are releasing this Monte Carlo simulation together with this publication. We also create a Monte Carlo simulation that reproduces the change of the AM modulus. We find that haloes in denser environments display the most dramatic evolution in their AM direction, as well as haloes with a lower specific AM modulus. These relations could be used to improve the way we follow the AM vector in low-resolution simulations.",
keywords = "methods: data analysis, methods: statistical, large-scale structure of Universe, HIERARCHICAL GALAXY FORMATION, MOLECULAR GAS CONTENTS, COSMOLOGICAL SIMULATIONS, COSMIC WEB, DISCS, CLASSIFICATION, PARAMETERS, LUMINOSITY, FEEDBACK, MODELS",
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Angular momentum evolution in dark matter haloes : a study of the Bolshoi and Millennium simulations. / Contreras, Sergio; Padilla, N.; Lagos, C. D. P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 472, No. 4, 12.2017, p. 4992-5003.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Angular momentum evolution in dark matter haloes

T2 - a study of the Bolshoi and Millennium simulations

AU - Contreras, Sergio

AU - Padilla, N.

AU - Lagos, C. D. P.

PY - 2017/12

Y1 - 2017/12

N2 - We use three different cosmological dark matter simulations to study how the orientation of the angular momentum (AM) vector in dark matter haloes evolve with time. We find that haloes in this kind of simulations are constantly affected by a spurious change of mass, which translates into an artificial change in the orientation of the AM. After removing the haloes affected by artificial mass change, we found that the change in the orientation of the AM vector is correlated with time. The change in its angle and direction (i.e. the angle subtended by the AM vector in two consecutive time-steps) that affect the AM vector has a dependence on the change of mass that affects a halo, the time elapsed in which the change of mass occurs and the halo mass. We create a Monte Carlo simulation that reproduces the change of angle and direction of the AM vector. We reproduce the angular separation of the AM vector since a lookback time of 8.5 Gyr to today (alpha) with an accuracy of approximately 0.05 in cos(alpha). We are releasing this Monte Carlo simulation together with this publication. We also create a Monte Carlo simulation that reproduces the change of the AM modulus. We find that haloes in denser environments display the most dramatic evolution in their AM direction, as well as haloes with a lower specific AM modulus. These relations could be used to improve the way we follow the AM vector in low-resolution simulations.

AB - We use three different cosmological dark matter simulations to study how the orientation of the angular momentum (AM) vector in dark matter haloes evolve with time. We find that haloes in this kind of simulations are constantly affected by a spurious change of mass, which translates into an artificial change in the orientation of the AM. After removing the haloes affected by artificial mass change, we found that the change in the orientation of the AM vector is correlated with time. The change in its angle and direction (i.e. the angle subtended by the AM vector in two consecutive time-steps) that affect the AM vector has a dependence on the change of mass that affects a halo, the time elapsed in which the change of mass occurs and the halo mass. We create a Monte Carlo simulation that reproduces the change of angle and direction of the AM vector. We reproduce the angular separation of the AM vector since a lookback time of 8.5 Gyr to today (alpha) with an accuracy of approximately 0.05 in cos(alpha). We are releasing this Monte Carlo simulation together with this publication. We also create a Monte Carlo simulation that reproduces the change of the AM modulus. We find that haloes in denser environments display the most dramatic evolution in their AM direction, as well as haloes with a lower specific AM modulus. These relations could be used to improve the way we follow the AM vector in low-resolution simulations.

KW - methods: data analysis

KW - methods: statistical

KW - large-scale structure of Universe

KW - HIERARCHICAL GALAXY FORMATION

KW - MOLECULAR GAS CONTENTS

KW - COSMOLOGICAL SIMULATIONS

KW - COSMIC WEB

KW - DISCS

KW - CLASSIFICATION

KW - PARAMETERS

KW - LUMINOSITY

KW - FEEDBACK

KW - MODELS

U2 - 10.1093/mnras/stx2410

DO - 10.1093/mnras/stx2410

M3 - Article

VL - 472

SP - 4992

EP - 5003

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -