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Optical monitoring of the gravitationally lensed quasarQ2237+0305 from APO between June 1995 and January 1998

R. W. SchmidtInstitute of Astronomy, Madingley Road, Cambridge CB3 0HA, UKTomislav KundićUe‐Li PenCanadian Institute of Theoretical Astrophysics, 60 St. George St., Toronto, M5S 3H8, CanadaEdwin L. TurnerPrinceton University Observatory, Peyton Hall, Princeton, NJ 08544, USAJ. WambsganßUniversität Potsdam, Institut für Physik, Am Neuen Palais 10, 14469 Potsdam, GermanyL. E. BergeronSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAWesley N. ColleyLincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, MA 02420, USACharles CorsonNational Optical Astronomy Observatory, PO Box 26732, Tucson, AZ 85726, USAN. C. HastingsT. HoyesMesa Community College, 1833 West Southern Ave., Mesa, Arizona 85202-4866, USADaniel C. LongKaren LoomisSangeeta MalhotraJohns Hopkins University, Charles and 34th Street, Bloomberg Center, Baltimore, MD 21210, USAJames E. RhoadsSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAK. Z. StanekHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

2002en

ABI

Annotatsiya

We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Woźniak et al. [CITE]).

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DOI: 10.1051/0004-6361:20020957

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