New strong lensing modelling of SDSS J2222+2745 enhanced with VLT/MUSE spectroscopy

Abstract

SDSS J2222+2745, at z = 0.489, is one of the few currently known lens clusters with multiple images of a background (z = 2.801) quasar with measured time delays. We combine imaging from the Hubble Space Telescope (HST) with recent Multi Unit Spectroscopic Explorer (MUSE) spectroscopic data to securely identify 34 cluster members and 12 multiple images from 3 background sources. We measure the stellar velocity dispersions of 13 cluster galaxies, enabling an independent estimate of the contribution of the sub-halo mass component to the lens total mass. The projected total mass distribution of the lens cluster is best modelled with a single large-scale mass component, a galaxy-scale component, anchored by the MUSE kinematic information, and an external shear. The best-fit strong lensing model yields a root mean square separation between the model-predicted and observed positions of the multiple images of 0".29. When analysing the impact of systematic uncertainties, stemming from modelling assumptions and used observables, we find that the projected total mass profile, relative weight of the sub-halo mass component, and critical lines are consistent, within the statistical uncertainties. The predicted magnification and time delay values are, instead, more sensitive to the local details of the lens total mass distribution, and vary significantly among lens models that are similarly good at reproducing the observed multiple image positions. Due to its complex morphology, the low number of point-like multiple images, and current model degeneracies, it becomes clear that additional information (from the observed surface brightness distribution of lensed sources and the measured time delays) needs to be included in the modelling of SDSS J2222+2745 for accurate and precise cosmological measurements. The full MUSE secure spectroscopic catalogue presented in this work is made publicly available.

17 pages, 9 Figures, 5 Tables. Accepted for publication in Astronomy & Astrophysics. The full MUSE spectroscopic catalogue presented in this work is made publicly available at www.fe.infn.it/astro/lensing

References in corpus (16)

• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• A Bayesian approach to strong lensing modelling of galaxy clusters
• The Data Processing Pipeline for the MUSE Instrument
• CLASH-VLT: Insights on the mass substructures in the Frontier Fields Cluster MACS J0416.1-2403 through accurate strong lens modeling
• A New Survey for Giant Arcs
• The systematics of strong lens modeling quantified: the effects of constraint selection and redshift information on magnification, mass, and multiple image predictability
• Mass distribution in the core of MACS J1206: robust modeling from an exceptionally large sample of central multiple images
• A new high-precision strong lensing model of the galaxy cluster MACS J0416.1-2403
• The Redshift Distribution of Giant Arcs in the Sloan Giant Arcs Survey
• CLASH-VLT: Abell~S1063. Cluster assembly history and spectroscopic catalogue
• MUSE observations of the lensing cluster SMACSJ2031.8-4036: new constraints on the mass distribution in the cluster core
• Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745
• Improved strong lensing modelling of galaxy clusters using the Fundamental Plane: Detailed mapping of the baryonic and dark matter mass distribution of Abell S1063
• VLT/MUSE observations of SDSS J1029+2623: towards a high-precision strong lensing model
• Pilot-WINGS: An extended MUSE view of the structure of Abell 370
• Constraining the multi-scale dark-matter distribution in CASSOWARY 31 with strong gravitational lensing and stellar dynamics

Cited by in corpus (11)

• JWST UNCOVER: Extremely red and compact object at$z_{\mathrm{phot}}\simeq 7.6$ triply imaged by Abell 2744
• Cosmography with Supernova Refsdal through time-delay cluster lensing: independent measurements of the Hubble constant and geometry of the Universe
• COOL-LAMPS III: Discovery of a 25".9 Separation Quasar Lensed by a Merging Galaxy Cluster
• Exploring the low-mass regime of galaxy-scale strong lensing: Insights into the mass structure of cluster galaxies
• Revealing the structure of the lensed quasar Q 0957+561 III. Constraints on the size of the broad-line region
• HOLISMOKES XIII: Strong-lens candidates at all mass scales and their environments from the Hyper-Suprime Cam and deep learning
• A variable active galactic nucleus at $z=2.06$ triply-imaged by the galaxy cluster MACS J0035.4-2015
• The powerful lens galaxy cluster PLCK G287.0+32.9 (${\theta }_E\sim 43^{\prime \prime }$)
• Cosmography from accurate mass modeling of the lens group SDSS J0100+1818: five sources at three different redshifts
• HOLISMOKES XVI: Lens search in HSC-PDR3 with a neural network committee and post-processing for false-positive removal
• Cosmic chronometers with galaxy clusters: a new avenue for multi-probe cosmology