SHARP - V. Modelling gravitationally-lensed radio arcs imaged with global VLBI observations

Abstract

We present milliarcsecond (mas) angular resolution observations of the gravitationally lensed radio source MG J0751+2716 (at z=3.2) obtained with global Very Long Baseline Interferometry (VLBI) at 1.65 GHz. The background object is highly resolved in the tangential and radial directions, showing evidence of both compact and extended structure across several gravitational arcs that are 200 to 600~mas in size. By identifying compact sub-components in the multiple images, we constrain the mass distribution of the foreground z=0.35 gravitational lens using analytic models for the main deflector [power-law elliptical mass model; $\rho (r)\propto r^{-\gamma }$, where $\gamma =2$ corresponds to isothermal] and for the members of the galaxy group. Moreover, our mass models with and without the group find an inner mass-density slope steeper than isothermal for the main lensing galaxy, with ${\gamma }_1=2.08\pm 0.02$ and ${\gamma }_2=2.16\pm 0.02$ at the 4.2$\sigma$ level and 6.8$\sigma$ level, respectively, at the Einstein radius ($b_1=0.4025\pm 0.0008$ and $b_2=0.307\pm 0.002$ arcsec, respectively). We find randomly distributed image position residuals of about 3 mas, which are much larger that the measurement errors ($40$ $\mu$as on average). This suggests that at the mas level, the assumption of a smooth mass distribution fails, requiring additional structure in the model. However, given the environment of the lensing galaxy, it is not clear whether this extra mass is in the form of sub-haloes within the lens or along the line of sight, or from a more complex halo for the galaxy group.

15 pages, 8 figures; published by MNRAS

References in corpus (21)

• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• Multi-Scale CLEAN deconvolution of radio synthesis images
• The Structure & Dynamics of Massive Early-type Galaxies: On Homology, Isothermality and Isotropy inside one Effective Radius
• Bayesian Strong Gravitational-Lens Modeling on Adaptive Grids: Objective Detection of Mass Substructure in Galaxies
• Galaxy growth in the concordance $\Lambda$CDM cosmology
• Inference of the Cold Dark Matter substructure mass function at z=0.2 using strong gravitational lenses
• The SL2S Galaxy-scale Lens Sample. V. Dark Matter Halos and Stellar IMF of Massive Early-type Galaxies out to Redshift 0.8
• Modelling the line-of-sight contribution in substructure lensing
• High resolution imaging of the anomalous flux-ratio gravitational lens system CLASS B2045+265: Dark or luminous satellites?
• The role of luminous substructure in the gravitational lens system MG 2016+112
• Multi-Scale CLEAN: A comparison of its performance against classical CLEAN in galaxies using THINGS
• Radio, optical and infrared observations of CLASS B0128+437
• Systematic variations of central mass density slopes in early-type galaxies
• The Gravitational Lens -- Galaxy Group Connection. II. Groups Associated with B2319+051 and B1600+434
• Red nuggets grow inside-out: evidence from gravitational lensing
• Lens Galaxy Properties of SBS1520+530: Insights from Keck Spectroscopy and AO Imaging
• The Environments of SLACS Gravitational Lenses
• Probing a massive radio galaxy with gravitational lensing
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Group Catalog
• Steepened inner density profiles of group galaxies via interactions: An N-body analysis
• The X-ray Properties of Moderate-redshift Galaxy Groups Selected by Association with Gravitational Lenses

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