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Title: Intrinsic alignments of galaxies in the MassiveBlack-II simulation: Analysis of two-point statistics

Journal Article · · Monthly Notices of the Royal Astronomical Society
DOI:https://doi.org/10.1093/mnras/stv272· OSTI ID:1183854
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); National Institute of Science Education and Research, Odisha (India)
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The intrinsic alignment of galaxies with the large-scale density field in an important astrophysical contaminant in upcoming weak lensing surveys. We present detailed measurements of the galaxy intrinsic alignments and associated ellipticity-direction (ED) and projected shape (wg₊) correlation functions for galaxies in the cosmological hydrodynamic MassiveBlack-II (MB-II) simulation. We carefully assess the effects on galaxy shapes, misalignment of the stellar component with the dark matter shape and two-point statistics of iterative weighted (by mass and luminosity) definitions of the (reduced and unreduced) inertia tensor. We find that iterative procedures must be adopted for a reliable measurement of the reduced tensor but that luminosity versus mass weighting has only negligible effects. Both ED and wg₊ correlations increase in amplitude with subhalo mass (in the range of 10¹⁰ – 6.0 X 10¹⁴h⁻¹ M⊙), with a weak redshift dependence (from z = 1 to z = 0.06) at fixed mass. At z ~ 0.3, we predict a wg₊ that is in reasonable agreement with SDSS LRG measurements and that decreases in amplitude by a factor of ~ 5–18 for galaxies in the LSST survey. We also compared the intrinsic alignment of centrals and satellites, with clear detection of satellite radial alignments within the host halos. Finally, we show that wg₊ (using subhalos as tracers of density and wδ (using dark matter density) predictions from the simulations agree with that of non-linear alignment models (NLA) at scales where the 2-halo term dominates in the correlations (and tabulate associated NLA fitting parameters). The 1-halo term induces a scale dependent bias at small scales which is not modeled in the NLA model.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC00112704
OSTI ID:
1183854
Report Number(s):
BNL-107972-2015-JA; KA2301020
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 448, Issue 4; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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Cited By (11)

The impact of AGN feedback on galaxy intrinsic alignments in the Horizon simulations journal January 2020
The impact of intrinsic alignment on current and future cosmic shear surveys journal December 2015
cosmolike – cosmological likelihood analyses for photometric galaxy surveys journal May 2017
Galaxy orientation with the cosmic web across cosmic time journal September 2018
The shape alignment of satellite galaxies in Local Group-like pairs from the SDSS journal January 2019
The impact of intrinsic alignment on current and future cosmic shear surveys text January 2015
The impact of AGN feedback on galaxy intrinsic alignments in the Horizon simulations text January 2019
Power spectrum of intrinsic alignments of galaxies in IllustrisTNG journal March 2021
Multitracing anisotropic non-Gaussianity with galaxy shapes journal December 2016
Nuisance parameters for large galaxy surveys preprint January 2016
Realistic systematic biases induced by residual intrinsic alignments in cosmic shear surveys preprint January 2019

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmology
theory - methods
numerical - hydrodynamics - gravitational lensing
weak - galaxies
star formation