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

With the aim of characterizing the flux and color variations of the multiplecomponents of the gravitationally lensed quasar UM673 as a function of time, wehave performed multi-epoch and multi-band photometric observations with theDanish 1.54m telescope at the La Silla Observatory.  The observations were carried out in the VRi spectral bands during fourseasons (2008--2011). We reduced the data using the PSF (Point Spread Function)photometric technique as well as aperture photometry.  Our results show for the brightest lensed component some significant decreasein flux between the first two seasons (+0.09/+0.11/+0.05 mag) and a subsequentincrease during the following ones (-0.11/-0.11/-0.10 mag) in the V/R/ispectral bands, respectively. Comparing our results with previous studies, wefind smaller color variations between these seasons as compared with previousones. We also separate the contribution of the lensing galaxy from that of thefainter and close lensed component.

Flux and color variations of the doubly imaged quasar UM673