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

Very deep ESO/VLT FORS1 and ISAAC images, as well as HST NICMOS2 data areused to infer the nature of the quasar pair LBQS 1429-0053 A and B, either abinary quasar or a doubly-imaged lensed quasar. Direct search of a putativelensing galaxy is unsuccessful . Moreover, no galaxy overdensity close to thequasar pair is found. A weak shear analysis of the field also fails atdetecting any concentration of dark matter and weakens the hypothesis of a darklens. The only sign of a possible lens consists in a group of 5 objects at z~1,within a radius of 5'', from the quasar pair. Considering this group as thelensing potential does not allow to reproduce the image position and flux ratioof the quasars. Our deep R-band image shows a blue, extended object at theposition of quasar A, which is consistent with either being the lensed quasar Ahost, or being an intervening galaxy at lower redshift. Unless future very deepoptical images demonstrate that this object is actually the lensed host of LBQS1429-0053, we conclude that there is very little evidence for this quasar beinglensed. Therefore, we are led to declare LBQS 1429-0053 A and B a genuinebinary quasar.Comment: 9 pages, 6 jpg images, accepted for publication in A&

LBQS 1429-0053: A binary quasar rather than a lensed quasar