Detecting low-mass haloes with strong gravitational lensing I: the effect of data quality and lensing configuration

Abstract

This paper aims to quantify how the lowest halo mass that can be detected with galaxy-galaxy strong gravitational lensing depends on the quality of the observations and the characteristics of the observed lens systems. Using simulated data, we measure the lowest detectable NFW mass at each location of the lens plane, in the form of detailed \emph{sensitivity maps}. In summary, we find that: (i) the lowest detectable mass $M_{\mathrm{low}}$ decreases linearly as the signal-to-noise ratio (SNR) increases and the sensitive area is larger when we decrease the noise; (ii) a moderate increase in angular resolution (0.07" vs 0.09") and pixel scale (0.01" vs 0.04") improves the sensitivity by on average 0.25 dex in halo mass, with more significant improvement around the most sensitive regions; (iii) the sensitivity to low-mass objects is largest for bright and complex lensed galaxies located inside the caustic curves and lensed into larger Einstein rings (i.e $r_E\ge 1.0"$). We find that for the sensitive mock images considered in this work, the minimum mass that we can detect at the redshift of the lens lies between $1.5\times 10^8$ and $3\times 10^9{M}_{\odot }$. We derive analytic relations between $M_{\mathrm{low}}$, the SNR and resolution and discuss the impact of the lensing configuration and source structure. Our results start to fill the gap between approximate predictions and real data and demonstrate the challenging nature of calculating precise forecasts for gravitational imaging. In light of our findings, we discuss possible strategies for designing strong lensing surveys and the prospects for HST, Keck, ALMA, Euclid and other future observations.

arXiv comment17 pages, 11 figures, accepted for publication in MNRAS. Comments welcome

References in corpus (51)

• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The Structure of Cold Dark Matter Halos
• The Aquarius Project: the subhalos of galactic halos
• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• Euclid Definition Study Report
• Subhaloes in Self-Interacting Galactic Dark Matter Haloes
• New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-$\alpha$ forest data
• The Sloan Lens ACS Survey. I. A Large Spectroscopically Selected Sample of Massive Early-Type Lens Galaxies
• The properties of warm dark matter haloes
• The Detection of a Population of Submillimeter-Bright, Strongly-Lensed Galaxies
• The haloes of bright satellite galaxies in a warm dark matter universe
• Gravitational detection of a low-mass dark satellite at cosmological distance
• Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81
• Detection of a Dark Substructure through Gravitational Imaging
• Bayesian Strong Gravitational-Lens Modeling on Adaptive Grids: Objective Detection of Mass Substructure in Galaxies
• Nonlinear Evolution of Cosmological Structures in Warm Dark Matter Models
• Warm dark matter chills out: constraints on the halo mass function and the free-streaming length of dark matter with 8 quadruple-image strong gravitational lenses
• ETHOS - An Effective Theory of Structure Formation: Dark matter physics as a possible explanation of the small-scale CDM problems
• Inference of the Cold Dark Matter substructure mass function at z=0.2 using strong gravitational lenses
• SHARP -- VII. New constraints on the dark matter free-streaming properties and substructure abundance from gravitationally lensed quasars
• A Magellanic Origin of the DES Dwarfs
• Detection of substructure with adaptive optics integral field spectroscopy of the gravitational lens B1422+231
• ALMA Observations of SPT-Discovered, Strongly Lensed, Dusty, Star-Forming Galaxies
• How well can cold-dark-matter substructures account for the observed radio flux-ratio anomalies?
• Modelling the line-of-sight contribution in substructure lensing
• Joint constraints on thermal relic dark matter from strong gravitational lensing, the Lyman-$\alpha$ forest, and Milky Way satellites
• Low-mass halo perturbations in strong gravitational lenses at redshift z$\sim$0.5 are consistent with CDM
• Dark Matter Constraints from a Unified Analysis of Strong Gravitational Lenses and Milky Way Satellite Galaxies
• Lensing substructure quantification in RXJ1131-1231: A 2 keV lower bound on dark matter thermal relic mass
• Constraining sterile neutrino cosmologies with strong gravitational lensing observations at redshift z~0.2
• Constraints on the properties of warm dark matter using the satellite galaxies of the Milky Way
• SIDM on FIRE: Hydrodynamical Self-Interacting Dark Matter simulations of low-mass dwarf galaxies
• Novel constraints on non-cold (non-thermal) Dark Matter from Lyman-$\alpha$ forest data
• The Importance of Intergalactic Structure to Gravitationally Lensed Quasars
• An unexpected high concentration for the dark substructure in the gravitational lens SDSSJ0946+1006
• The BOSS Emission-Line Lens Survey. III. : Strong Lensing of Ly$\alpha$ Emitters by Individual Galaxies
• Quantifying dwarf satellites through gravitational imaging: the case of SDSS J120602.09+514229.5
• Projection effects in the strong lensing study of subhaloes
• Probing the nature of dark matter by forward modeling flux ratios in strong gravitational lenses
• The interplay of Self-Interacting Dark Matter and baryons in shaping the halo evolution
• A novel 3D technique to study the kinematics of lensed galaxies
• A novel approach to visibility-space modelling of interferometric gravitational lens observations at high angular resolution
• SHARP - I. A high-resolution multi-band view of the infra-red Einstein ring of JVAS B1938+666
• Resolving on 100 pc scales the UV-continuum in Lyman-$\alpha$ emitters between redshift 2 to 3 with gravitational lensing
• Strong Gravitational Lensing with SKA
• Inferring the concentration of dark matter subhalos perturbing strongly lensed images
• The Effect of Particle Noise in N-body Simulations of Gravitational Lensing
• Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses
• Galaxy-galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes