We present precise measurements of the assembly bias of dark matter halos, i.e. the dependence of halo bias on other properties than the mass, using curved "separate universe" N-body simulations which effectively incorporate an infinite-wavelength matter overdensity into the background density. This method measures the LIMD (local-in-matter-density) bias parameters bn in the large-scale limit. We focus on the dependence of the first two Eulerian biases bE1 and bE2 on four halo properties: the concentration, spin, mass accretion rate, and ellipticity. We quantitatively compare our results with previous works in which assembly bias was measured on fairly small scales. Despite this difference, our findings are in good agreement with previous results. We also look at the joint dependence of bias on two halo properties in addition to the mass. Finally, using the excursion set peaks model, we attempt to shed new insights on how assembly bias arises in this analytical model.

Lazeyras, T., Musso, M., Schmidt, F. (2017). Large-scale assembly bias of dark matter halos. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2017(3) [10.1088/1475-7516/2017/03/059].

Large-scale assembly bias of dark matter halos

Lazeyras T.
;
2017

Abstract

We present precise measurements of the assembly bias of dark matter halos, i.e. the dependence of halo bias on other properties than the mass, using curved "separate universe" N-body simulations which effectively incorporate an infinite-wavelength matter overdensity into the background density. This method measures the LIMD (local-in-matter-density) bias parameters bn in the large-scale limit. We focus on the dependence of the first two Eulerian biases bE1 and bE2 on four halo properties: the concentration, spin, mass accretion rate, and ellipticity. We quantitatively compare our results with previous works in which assembly bias was measured on fairly small scales. Despite this difference, our findings are in good agreement with previous results. We also look at the joint dependence of bias on two halo properties in addition to the mass. Finally, using the excursion set peaks model, we attempt to shed new insights on how assembly bias arises in this analytical model.
Articolo in rivista - Articolo scientifico
cluster counts; dark matter simulations; galaxy clustering;
English
2017
2017
3
059
open
Lazeyras, T., Musso, M., Schmidt, F. (2017). Large-scale assembly bias of dark matter halos. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2017(3) [10.1088/1475-7516/2017/03/059].
File in questo prodotto:
File Dimensione Formato  
Lazeyras-2017-JCAP-VoR.pdf

accesso aperto

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Licenza: Creative Commons
Dimensione 2.28 MB
Formato Adobe PDF
2.28 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/480843
Citazioni
  • Scopus 33
  • ???jsp.display-item.citation.isi??? 48
Social impact