English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Binary and dual active galactic nuclei (AGN) are an important observationaltool for studying the formation and dynamical evolution of galaxies andsupermassive black holes (SMBHs). An entirely new method for identifyingpossible AGN pairs makes use of the exquisite positional accuracy of Gaia todetect astrometrically-variable quasars, in tandem with the high spatialresolution of the Karl G. Jansky Very Large Array (VLA). We present a new pilotstudy of radio observations of 18 quasars (0.8 < z < 2.9), selected from theSDSS DR16Q and matched with the Gaia DR3. All 18 targets are identified bytheir excess astrometric noise in Gaia. We targeted these 18 quasars with theVLA at 2-4 GHz (S-band) and 8-12 GHz (X-band), providing resolutions of 0.65"and 0.2", respectively, in order to constrain the origin of this variability.We combine these data with ancillary radio survey data and perform radiospectral modeling. The new observations are used to constrain the driver of theexcess astrometric noise. We find that ~39% of the target sample is likely tobe either candidate dual AGN or gravitationally lensed quasars. Ultimately, weuse this new strategy to help identify and understand this sample ofastrometrically-variable quasars, demonstrate the potential of this method forsystematically identifying kpc-scale dual quasars.

VaDAR: Varstrometry for Dual AGN using Radio interferometry