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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We analyze all publicly available long-term optical observations of thegravitationally lensed quasar PG1115+080 for the purpose of estimating timedelays between its four components. In particular, the light curves ofPG1115+080 components obtained in 2001-2006 at Maidanak observatory(Uzbekistan) (Tsvetkova et al 2010} are considered. We find that the lineartrend is observed in 2006 in light curves of all four components with fastvariations only in the A1 and C components that can be due to microlensing andobservational errors. Application of the MCCF method (Oknyansky 1993) to thephotometric data obtained in 2004-2005 gives values of time delays $\tau_{BC} =22^{+2}_{-3}$, $\tau_{AC} = 12^{+2}_{-1}$ and $\tau_{BA} = 10^{+2}_{-3}$ days,which are in agreement with the results received earlier by Schechter andBarkana for 1995-1996 light curves with two different methods of statisticanalysis. However, our estimates of $\tau_{BA}$ and $\tau_{BC}$ differ from thevalues received by the group of Vakulik based on the same Maidanak data(Vakulik et al 2009). The ratio $\tau_{AC}/\tau_{BA}$ is equal to $\sim 1.2$that is close to the value, received by Barkana ($\sim 1.13$) and predicted bylens models ($\sim1.4$), unlike the values received by Schechter ($\sim 0.7$)and Vakulik ($\sim 2.7$).

New Estimates of Time Delays in the Gravitationally Lensed System PG1115+080