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

We present discovery images, together with follow‐up imaging and spectroscopy, of two large‐separation gravitational lenses found by our survey for wide arcs [the CAmbridge Sloan Survey Of Wide ARcs in the skY (CASSOWARY)]. The survey exploits the multicolour photometry of the Sloan Digital Sky Survey to find multiple blue components around red galaxies. CASSOWARY 2 (or ‘the Cheshire Cat’) is composed of two massive early‐type galaxies at   z = 0.426  and 0.432, respectively, lensing two background sources, the first a star‐forming galaxy at   z = 0.97  and the second a high ‐redshift galaxy  ( z  &gt; 1.4) . There are at least three images of the former source and probably four or more of the latter, arranged in two giant arcs. The mass enclosed within the larger arc of radius ∼11 arcsec is  ∼33 × 10 12  M ⊙  . CASSOWARY 3 comprises an arc of three bright images of a   z = 0.725  source, lensed by a foreground elliptical at   z = 0.274 . The radius of the arc is ∼4 arcsec and the enclosed mass is  ∼2.5 × 10 12  M ⊙  . Together with earlier discoveries like the Cosmic Horseshoe and the 8 o'clock Arc, these new systems, with separations intermediate between the arcsecond‐separation lenses of typical strong galaxy lensing and arcminute‐separation cluster lenses, probe the very high end of the galaxy mass function.

Two new large‐separation gravitational lenses from SDSS