Probing Dark Matter with Strong Gravitational Lensing through an Effective Density Slope

Abstract

Many dark matter (DM) models that are consistent with current cosmological data show differences in the predicted (sub)halo mass function, especially at sub-galactic scales, where observations are challenging due to the inefficiency of star formation. Strong gravitational lensing has been shown to be a useful tool for detecting dark low-mass (sub)halos through perturbations in lensing arcs, therefore allowing the testing of different DM scenarios. However, measuring the total mass of a perturber from strong lensing data is challenging. Over or underestimating perturber masses can lead to incorrect inferences about the nature of DM. In this paper, we argue that inferring an effective slope of the dark matter density profile, which is the power-law slope of perturbers at intermediate radii, where we expect the perturber to have the largest observable effect, is a promising way to circumvent these challenges. Using N-body simulations, we show that (sub)halo populations under different DM scenarios differ in their effective density slope distributions. Using realistic mocks of Hubble Space Telescope observations of strong lensing images, we show that the effective density slope of perturbers can be robustly measured with high enough accuracy to discern between different models. We also present our measurement of the effective density slope $\gamma =1.96\begin{array}{c}+0.12\\ -0.12\end{array}$ for the perturber in JVAS B1938+666, which we find to be a $2\sigma$ outlier of the cold dark matter scenario. More measurements of this kind are needed to be able to draw robust conclusions about the nature of dark matter.

arXiv comment23 pages, 18 figures, Matches MNRAS published version

References in corpus (97)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Dark Matter Substructure in Galactic Halos
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Observational evidence for self-interacting cold dark matter
• Cold and Fuzzy Dark Matter
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Halo Formation in Warm Dark Matter Models
• Dark Matter Self-interactions and Small Scale Structure
• Cold dark matter haloes in the Planck era: evolution of structural parameters for Einasto and NFW profiles
• How supernova feedback turns dark matter cusps into cores
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• The Core-Cusp Problem
• The large-scale structure of the Universe
• Cosmological Simulations with Self-Interacting Dark Matter I: Constant Density Cores and Substructure
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
• Cuspy No More: How Outflows Affect the Central Dark Matter and Baryon Distribution in Lambda CDM Galaxies
• The Cores of Dwarf Galaxy Halos
• Direct Detection of CDM Substructure
• The cored distribution of dark matter in spiral galaxies
• Subhaloes in Self-Interacting Galactic Dark Matter Haloes
• Dark Matter Halos as Particle Colliders: A Unified Solution to Small-Scale Structure Puzzles from Dwarfs to Clusters
• Mass Density Profiles of LSB Galaxies
• Evidence for substructure in lens galaxies?
• The properties of warm dark matter haloes
• The unexpected diversity of dwarf galaxy rotation curves
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• Mass loss from dwarf spheroidal galaxies: the origins of shallow dark matter cores and exponential surface brightness profiles
• The haloes of bright satellite galaxies in a warm dark matter universe
• Gravitational detection of a low-mass dark satellite at cosmological distance
• Fluid Dark Matter
• Compound gravitational lensing as a probe of dark matter substructure within galaxy halos
• The Impact of Baryonic Physics on the Structure of Dark Matter Halos: the View from the FIRE Cosmological Simulations
• H0LiCOW - IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant
• The population of galaxy-galaxy strong lenses in forthcoming optical imaging surveys
• Shapelets: I. A Method for Image Analysis
• Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81
• Core Formation in Dwarf Halos with Self Interacting Dark Matter: No Fine-Tuning Necessary
• Detection of a Dark Substructure through Gravitational Imaging
• Cosmological puzzle resolved by stellar feedback in high redshift galaxies
• How the Self-Interacting Dark Matter Model Explains the Diverse Galactic Rotation Curves
• The impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies
• Universal structure of dark matter haloes over a mass range of 20 orders of magnitude
• ETHOS - An Effective Theory of Structure Formation: Dark matter physics as a possible explanation of the small-scale CDM problems
• ETHOS - An Effective Theory of Structure Formation: From dark particle physics to the matter distribution of the Universe
• FIRE in the Field: Simulating the Threshold of Galaxy Formation
• STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354
• The power spectrum of SUSY-CDM on sub-galactic scales
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: RSD measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies
• The stellar mass-halo mass relation of isolated field dwarfs: a critical test of $\Lambda$CDM at the edge of galaxy formation
• Inference of the Cold Dark Matter substructure mass function at z=0.2 using strong gravitational lenses
• Maximum Feedback and Dark Matter Profiles of Dwarf Galaxies
• lenstronomy II: A gravitational lensing software ecosystem
• Analytic models of plausible gravitational lens potentials
• Dark Matter from Early Decays
• MaGICC Disks: Matching Observed Galaxy Relationships Over a Wide Stellar Mass Range
• Gravitational probes of dark matter physics
• Gravitational lens modeling with basis sets
• The Warm DM halo mass function below the cut-off scale
• Non-circular motions and the diversity of dwarf galaxy rotation curves
• Detection of substructure with adaptive optics integral field spectroscopy of the gravitational lens B1422+231
• Probing dark matter structure down to $10^7$ solar masses: flux ratio statistics in gravitational lenses with line of sight halos
• Detecting dark matter substructure spectroscopically in strong gravitational lenses
• All about baryons: revisiting SIDM predictions at small halo masses
• Low-mass halo perturbations in strong gravitational lenses at redshift z$\sim$0.5 are consistent with CDM
• Lensing substructure quantification in RXJ1131-1231: A 2 keV lower bound on dark matter thermal relic mass
• Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves
• Hints on the Nature of Dark Matter from the Properties of Milky Way Satellites
• Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism
• Measuring the power spectrum of dark matter substructure using strong gravitational lensing
• Discovering New Strong Gravitational Lenses in the DESI Legacy Imaging Surveys
• Dark Matter Cores and Cusps in Spiral Galaxies and their Explanations
• Mining for Dark Matter Substructure: Inferring subhalo population properties from strong lenses with machine learning
• An unexpected high concentration for the dark substructure in the gravitational lens SDSSJ0946+1006
• On the Effects of Line-of-Sight Structures on Lensing Flux-ratio Anomalies in a LCDM Universe
• Simulations of Strong Gravitational Lensing with Substructure
• Substructure in the lens HE 0435-1223
• Molecular Gas in Lensed z>2 Quasar Host Galaxies and the Star Formation Law for Galaxies with Luminous Active Galactic Nuclei
• DASH: a library of dynamical subhalo evolution
• Detection of Substructure in the Gravitationally Lensed Quasar MG0414+0534 using Mid-Infrared and Radio VLBI Observations
• Redshifts of the Gravitational Lenses MG1131+0456 and B1938+666
• On the Power Spectrum of Dark Matter Substructure in Strong Gravitational Lenses
• Gravitational Lensing and the Power Spectrum of Dark Matter Substructure: Insights from the ETHOS N-body Simulations
• Substructure Detection Reanalyzed: Dark Perturber shown to be a Line-of-Sight Halo
• On the density profile of dark matter substructure in gravitational lens galaxies
• SHARP - I. A high-resolution multi-band view of the infra-red Einstein ring of JVAS B1938+666
• A Dark Census: Statistically Detecting the Satellite Populations of Distant Galaxies
• Probing the small-scale structure in strongly lensed systems via transdimensional inference
• Beyond subhalos: Probing the collective effect of the Universe's small-scale structure with gravitational lensing
• A robust mass estimator for dark matter subhalo perturbations in strong gravitational lenses
• Quantifying the Line-of-Sight Halo Contribution to the Dark Matter Convergence Power Spectrum from Strong Gravitational Lenses
• Inferring the concentration of dark matter subhalos perturbing strongly lensed images
• Extracting the Subhalo Mass Function from Strong Lens Images with Image Segmentation
• Image segmentation for analyzing galaxy-galaxy strong lensing systems
• Bars in dark matter-dominated dwarf galaxy discs
• Quantifying the power spectrum of small-scale structure in semi-analytic galaxies