Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

R. W. Schmidt, T. Kundic, U. L. Pen, E. L. Turner, J. Wambsganss, L. E. Bergeron, W. N. Colley, C. Corson, N. C. Hastings, T. Hoyes, D. C. Long, K. A. Loomis, S. Malhotra, J. E. Rhoads, K. Z. Stanek

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

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. 2000a).

Original languageEnglish (US)
Pages (from-to)773-779
Number of pages7
JournalAstronomy and Astrophysics
Volume392
Issue number3
DOIs
StatePublished - Sep 2002

Keywords

  • Cosmology: observations
  • Dark matter
  • Gravitational lensing
  • Quasars: individual: Q2237+0305

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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