Precision cosmology with time delay lenses: high resolution imaging requirements

Abstract

Lens time delays are a powerful probe of cosmology, provided that the gravitational potential of the main deflector can be modeled with sufficient precision. Recent work has shown that this can be achieved by detailed modeling of the host galaxies of lensed quasars, which appear as "Einstein Rings" in high resolution images. We carry out a systematic exploration of the high resolution imaging required to exploit the thousands of lensed quasars that will be discovered by current and upcoming surveys with the next decade. Specifically, we simulate realistic lens systems as imaged by the Hubble Space Telescope (HST), James Webb Space Telescope (JWST), and ground based adaptive optics images taken with Keck or the Thirty Meter Telescope (TMT). We compare the performance of these pointed observations with that of images taken by the Euclid (VIS), Wide-Field Infrared Survey Telescope (WFIRST) and Large Synoptic Survey Telescope (LSST) surveys. We use as our metric the precision with which the slope ${\gamma }^{\prime }$ of the total mass density profile ${\rho }_{tot}\propto r^{-{\gamma }^{\prime }}$ for the main deflector can be measured. Ideally, we require that the statistical error on ${\gamma }^{\prime }$ be less than 0.02, such that it is subdominant to other sources of random and systematic uncertainties. We find that survey data will likely have sufficient depth and resolution to meet the target only for the brighter gravitational lens systems, comparable to those discovered by the SDSS survey. For fainter systems, that will be discovered by current and future surveys, targeted follow-up will be required. However, the exposure time required with upcoming facilitites such as JWST, the Keck Next Generation Adaptive Optics System, and TMT, will only be of order a few minutes per system, thus making the follow-up of hundreds of systems a practical and efficient cosmological probe.

29 pages, 10 figures, JCAP (in press). A full resolution, continuously updated version can be viewed at https://github.com/tommasotreu/HIGHRESOLUTIONIMAGING/blob/master/paper/High_resolution_imaging_requirements.pdf We invite comments and questions at https://github.com/tommasotreu/HIGHRESOLUTIONIMAGING/issues

References in corpus (20)

• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• The Sloan Lens ACS Survey. V. The Full ACS Strong-Lens Sample
• The Sloan Lens ACS Survey. VI: Discovery and analysis of a double Einstein ring
• The Sloan Digital Sky Survey Quasar Lens Search. I. Candidate Selection Algorithm
• The SL2S Galaxy-scale Lens Sample. V. Dark Matter Halos and Stellar IMF of Massive Early-type Galaxies out to Redshift 0.8
• Strong Lens Time Delay Challenge: II. Results of TDC1
• The SL2S Galaxy-scale Lens Sample. II. Cosmic evolution of dark and luminous mass in early-type galaxies
• The Sloan Lens ACS Survey. XII. Extending Strong Lensing to Lower Masses
• Lens galaxies in the Illustris simulation: power-law models and the bias of the Hubble constant from time-delays
• COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VI. Redshift of the lensing galaxy in seven gravitationally lensed quasars
• Cosmological Constraints from Gravitational Lens Time Delays
• VIS: the visible imager for Euclid
• NFIRAOS First Facility AO System for the Thirty Meter Telescope
• The Infrared Imaging Spectrograph (IRIS) for TMT: Instrument Overview
• Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey
• The Infrared Imaging Spectrograph (IRIS) for TMT: Instrument Overview
• Strong Lensing by Galaxies
• Tailoring Strong Lensing Cosmographic Observations
• Strong Gravitational Lensing as a Probe of Gravity, Dark-Matter and Super-Massive Black Holes
• High resolution imaging and spectroscopy of the gravitational lens SDSSJ1206+4332: a natural coronagraph at $z=1.789$ and a standard ruler at $z=0.745$

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