Fig. 1.
Light curves of SDSS J1339+1310AB from its discovery to 2019. These r-band brightness records of the two quasar images are based on observations from four different facilities that are labelled as LT, MT, ST, and PS1 (see main text). Magnitudes of a field star are offset by +2.0 (triangles) to facilitate comparison with strong quasar variations. Dates of spectroscopic observations are marked by vertical dotted lines.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.