Effects of galaxy-halo alignment and adiabatic contraction on gravitational lens statistics

Abstract

We study the strong gravitational lens statistics of triaxial cold dark matter (CDM) halos occupied by central early-type galaxies. We calculate the image separation distribution for double, cusp and quad configurations. The ratios of image multiplicities at large separations are consistent with the triaxial NFW model, and at small separations are consistent with the singular isothermal ellipsoid (SIE) model. At all separations, the total lensing probability is enhanced by adiabatic contraction. If no adiabatic contraction is assumed, naked cusp configurations become dominant at approximately 2.5'', which is inconsistent with the data. We also show that at small-to-moderate separations, the image multiplicities depend sensitively on the alignment of the shapes of the luminous and dark matter projected density profiles. In constrast to other properties that affect these ratios, the degree of alignment does not have a significant effect on the total lensing probability. These correlations may therefore be constrained by comparing the theoretical image separation distribution to a sufficiently large lens sample from future wide and deep sky surveys such as Pan-Starrs, LSST and JDEM. Understanding the correlations in the shapes of galaxies and their dark matter halo is important for future weak lensing surveys.

arXiv comment10 pages, 7 figures

References in corpus (53)

• Profiles of dark haloes: evolution, scatter, and environment
• An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
• Response of dark matter halos to condensation of baryons: cosmological simulations and improved adiabatic contraction model
• Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations
• Linking halo mass to galaxy luminosity
• The Shape of Dark Matter Halos: Dependence on Mass, Redshift, Radius, and Formation
• Intrinsic and Extrinsic Galaxy Alignment
• A discriminating probe of gravity at cosmological scales
• The Cosmic Lens All-Sky Survey: I. Source selection and observations
• The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up
• The Effect of Gas Cooling on the Shapes of Dark Matter Halos
• Spin induced galaxy alignments and their implications for weak lensing measurements
• Early-type galaxies in the SDSS. II. Correlations between observables
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• Shear and Ellipticity in Gravitational Lenses
• Weak lensing surveys and the intrinsic correlation of galaxy ellipticities
• The Effect of Dissipation on the Shapes of Dark halos
• The Angular Momentum of Gas in Proto-Galaxies I. Implications for the Formation of Disk Galaxies
• Tests for Substructure in Gravitational Lenses
• A Gravitationally Lensed Quasar with Quadruple Images Separated by 14.62 Arcseconds
• On the Growth of Perturbations as a Test of Dark Energy
• Internal Alignment of the Halos of Disk Galaxies in Cosmological Hydrodynamic Simulations
• Intrinsic correlation of halo ellipticity and its implications for large-scale weak lensing surveys
• CDM and Strong Lensing: Concord or Conflict?
• Gravitational Lens Statistics for Generalized NFW Profiles: Parameter Degeneracy and Implications for Self-Interacting Cold Dark Matter
• The Cosmic Lens All-Sky Survey: statistical strong lensing, cosmological parameters, and global properties of galaxy populations
• Arc Statistics in Triaxial Dark Matter Halos: Testing the Collisionless Cold Dark Matter Paradigm
• Global Probes of the Impact of Baryons on Dark Matter Halos
• Constraints on the Inner Mass Profiles of Lensing Galaxies from Missing Odd Images
• What is L*?: Anatomy of the Galaxy Luminosity Function
• Lensing Constraints on the Cores of Massive Dark Matter Halos
• Effects of Triaxiality on the Statistics of Large-Separation Gravitational Lenses
• The image separation distribution of strong lenses: Halo versus subhalo populations
• Constraint on the Post-Newtonian Parameter gamma on Galactic Size Scales
• Why is the Fraction of Four-Image Radio Lens Systems So High?
• Isophotal Shapes of Elliptical/S0 Galaxies from the Sloan Digital Sky Survey
• Strong Gravitational Lensing and Dark Energy
• Strong Gravitational Lensing Time Delay Statistics and the Density Profile of Dark Halos
• Effects of Ellipticity and Shear on Gravitational Lens Statistics
• Gravitational Lensing Statistics in Universes Dominated by Dark Energy
• A Simple Method To Find All Lensed Quasars
• The Effects of Massive Substructures on Image Multiplicities in Gravitati onal Lenses
• Gravitational Lens Statistics and The Density Profile of Dark Halos
• Strong lensing statistics in large, z~<0.2 surveys: bias in the lens galaxy population
• Shapes of Stellar Systems and Dark Halos from Simulations of Galaxy Major Mergers
• Analytic expressions for mean magnification by a quadrupole gravitational lens
• Constraints on the Inner Cluster Mass Profile and the Power Spectrum Normalization from Strong Lensing Statistics
• Schechter vs. Schechter: Sub-Arcsecond Gravitational Lensing and Inner Halo Profiles
• Mass Follows Light
• Constraints on the Baryonic Compression and Implications for the Fraction of Dark Halo Lenses
• Lensing effects of misaligned disks in dark matter halos
• Statistics of Magnification Perturbations by Substructure in the Cold Dark Matter Cosmological Model
• The Multi-Band Magnification Bias for Gravitational Lenses

Cited by in corpus (13)

• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• The dark matter of gravitational lensing
• Strong gravitational lensing of explosive transients
• What is the largest Einstein radius in the universe?
• Halo Shapes From Weak Lensing: The Impact of Galaxy--Halo Misalignment
• Constraints on the shapes of galaxy dark matter haloes from weak gravitational lensing
• SDSSJ2222+2745 A Gravitationally Lensed Sextuple Quasar with Maximum Image Separation of 15.1" Discovered in the Sloan Giant Arcs Survey
• The Hidden Fortress: Structure and substructure of the complex strong lensing cluster SDSS J1029+2623
• The effects of baryonic cooling on the concentration-mass relation
• SDSS J0909$+$4449: A Large-separation Strongly Lensed Quasar at $z\sim 2.8$ with Three Images
• Systematic or Signal? How dark matter misalignments can bias strong lensing models of galaxy clusters
• X-ray and strong lensing mass estimate of MS2137.3-2353
• The Chandra view of the Largest Quasar Lens SDSS J1029+2623