The case for gravitational millilensing in the multiply--imaged quasar B1152+199
arXiv:1811.06053 · doi:10.1093/mnras/stz3450
Abstract
Previous Very Long Baseline Interferometry (VLBI) observations of the quasar B1152+199 at 5GHz has revealed two images of a strongly lensed jet with seemingly discordant morphologies. Whereas the jet appears straight in one of the images, the other exhibits slight curvature on milliarcsecond scales. This is unexpected from the lensing solution and has been interpreted as possible evidence for secondary, small-scale lensing (millilensing) by a compact object with a mass of - located close to the curved image. The probability for such a superposition is extremely low unless the millilens population has very high surface number density. Here, we revisit the case for millilensing in B1152+199 by combining new global-VLBI data at 8.4GHz with two datasets from the European VLBI Network (EVN) at 5GHz (archival) and at 22GHz (new dataset), and the previously published 5GHz Very Long Baseline Array (VLBA) data. We find that the new data with a more circular synthesized beam, exhibits no apparent milliarcsecond-scale curvature in image B. Various observations of the object spanning 15 years apart enable us to improve the constraints on lens system (thanks also to the improved astrometry resulting from 22GHz observations) to the point that the only plausible explanation left for the apparent curvature is the artifact due to the shape of the synthesized beam.
arXiv comment9 pages, 4 figures, submitted to MNRAS
References in corpus (24)
- Gravitational detection of a low-mass dark satellite at cosmological distance
- The Mass Distribution of SDSS J1004+4112 Revisited
- Detection of lensing substructure using ALMA observations of the dusty galaxy SDP.81
- The number and size of subhalo-induced gaps in stellar streams
- Limits on the cosmological abundance of supermassive compact objects from a search for multiple imaging in compact radio sources
- Detection of substructure with adaptive optics integral field spectroscopy of the gravitational lens B1422+231
- Constraints on the identity of the dark matter from strong gravitational lenses
- Substructure and galaxy formation in the Copernicus Complexio warm dark matter simulations
- CLASS B1152+199 and B1359+154: Two New Gravitational Lens Systems Discovered in the Cosmic Lens All-Sky Survey
- Quantifying dwarf satellites through gravitational imaging: the case of SDSS J120602.09+514229.5
- High resolution observations and mass modelling of the CLASS gravitational lens B1152+199
- 3FGL Demographics Outside the Galactic Plane using Supervised Machine Learning: Pulsar and Dark Matter Subhalo Interpretations
- Detecting Dark Matter Substructures around the Milky Way with Gaia
- Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
- Detection of Substructure in the Gravitationally Lensed Quasar MG0414+0534 using Mid-Infrared and Radio VLBI Observations
- Gravitational lensing as a probe of cold dark matter subhalos
- The Detection of Pure Dark Matter Objects with Bent Multiply Imaged Radio Jets
- ALMA Imprint of Intergalactic Dark Structures in the Gravitational Lens SDP.81
- Tidal Imprints of a Dark Sub-Halo on the Outskirts of the Milky Way II. Perturber Azimuth
- Dark matter subhalos and unidentified sources in the Fermi 3FGL source catalog
- High-Angular-Resolution and High-Sensitivity Science Enabled by Beamformed ALMA
- Modeling GD-1 Gaps in a Milky-Way Potential
- The Arecibo Galaxy Environment Survey X: The Structure of Halo Gas Around M33
- Hunting for dark halo substructure using submilliarcsecond-scale observations of macrolensed radio jets