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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Gravitational microlensing is a powerful tool for probing the inner structureof distant quasars. In this context, we have obtained spectropolarimetricobservations of the two images of the broad absorption line (BAL) quasarSDSSJ081830.46+060138.0 (J0818+0601) at redshift $z \simeq$ 2.35. We first showthat J0818+0601 is actually gravitationally lensed, and not a binary quasar. Astrong absorption system detected at $z$ = 1.0065$\pm$0.0002 is possibly due tothe lensing galaxy. Microlensing is observed in one image and it magnifies theemission lines, the continuum, and the BALs differently. By disentangling thepart of the spectrum that is microlensed from the part that is not microlensed,we unveil two sources of continuum that must be spatially separated: a compactone, which is microlensed, and an extended one, which is not microlensed andcontributes to two thirds of the total continuum emission. J0818+0601 is thesecond BAL quasar in which an extended source of rest-frame ultravioletcontinuum is found. We also find that the images are differently polarized,suggesting that the two continua might be differently polarized. Our analysisprovides constraints on the BAL flow. In particular, we find that the outflowis seen with a nonzero onset velocity, and stratified according to ionization.

Spatially separated continuum sources revealed by microlensing in the gravitationally lensed broad absorption line quasar SDSSJ081830.46+060138.0