Open AccessImage reconstruction technique and optical monitoring of the QSO2237+0305 from Maidanak Observatory in 2002–2003
Author(s) -
Koptelova E.,
Shimanovskaya E.,
Artamonov B.,
Sazhin M.,
Yagola A.,
Bruevich V.,
Burkhonov O.
Publication year - 2005
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.08451.x
Subject(s) - physics , gravitational microlensing , gravitational lens , photometry (optics) , brightness , quasar , astrophysics , observatory , astronomy , light curve , stars , galaxy , redshift
We have observed the gravitational lens system Q2237+0305 from the Maidanak Observatory over the period from 2002 August to 2003 November. Here we report the results of our observations. We implemented a two‐stage technique that has been developed specifically for the purpose of gravitational lens image reconstruction. The technique is based on the Tikhonov regularization approach and allows one to obtain astrometric and photometric characteristics of the gravitational lens system. Light curves with 78 data points for the four quasar components are obtained. Slow brightness variations over the observational period are found in all components. Images A, C and D have a tendency to decrease in brightness. Image B does not vary more than 0.05 mag. The observations did not reveal evidence for large variations in brightness of the components due to microlensing effects. To provide an overall picture of the photometry behaviour, our data are combined with the Maidanak observations published for 1995–2000.