TIME DELAY BETWEEN IMAGES OF THE LENSED QUASAR UM673

Автор(и)

  • E. Koptelova Astronomical observatory of Odessa National University, Odessa, Ukraine, Taiwan
  • W. P. Chen Graduate Institute of Astronomy, National Central University, Jhongli City, Taiwan, Taiwan
  • T. Chiueh Department of Physics, National Taiwan University, Taipei, Taiwan, Taiwan
  • B. P. Artamonov Sternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Moscow, Russia, Russian Federation
  • V. L. Oknyanskij Sternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Moscow, Russia, Russian Federation
  • S. N. Nuritdinov Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Tashkent, Uzbekistan, Uzbekistan
  • O. Burkhonov Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Tashkent, Uzbekistan, Uzbekistan
  • T. Akhunov Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Tashkent, Uzbekistan; Institut d'Astrophysique et de Geophysique, Universite de Liege, Allee du 6 Aout 17, Sart Tilman, B5c, 4000 Liege, Belgium, Uzbekistan
  • V. V. Bruevich Sternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Moscow, Russia, Russian Federation
  • O. V. Ezhkova Sternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Moscow, Russia, Russian Federation
  • A. S. Gusev Sternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Moscow, Russia, Russian Federation
  • A. V. Sergeyev Institute of Radio Astronomy, Krasnoznamennaya 4, 61002 Kharkov, Ukraine, Ukraine
  • Sh. A. Ehgamberdiev Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Tashkent, Uzbekistan, Uzbekistan
  • M. A. Ibragimov Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Tashkent, Uzbekistan, Uzbekistan

DOI:

https://doi.org/10.18524/1810-4215.2012.25.83310

Анотація

We study brightness variations in the double lensed quasar UM673 (Q0142-100) with the aim of measuring the time delay between its two images. Methods.. We analyzed the V, R and I-band light curves of the A and B images of UM673, which cover ten observational seasons from August 2001 to November 2010. We also analyzed the time evolution of the difference in magnitudes (flux ratio) between images A and B of UM673 over more than ten years. We find that the quasar exhibits both short-term (with an amplitude of ~ 0.1 mag in the R band) and long-term (with an amplitude of ~ 0.3 mag) variability on timescales of about several months and several years, respectively. These brightness variations are used to constrain the time delay between the images of UM673. From a cross-correlation analysis of the A and B quasar light curves and an error analysis we measure a mean time delay of 89 days with an rms error of 11 days.

Посилання

Dudinov V., Bliokh P., Paczynski B. et al.: 2000, Kinematika i fizika nebesnyh tel, 3, 170.

Koptelova, E., Shimanovskaya E., Artamonov B.: 2005, MNRAS, 356, 323.

Koptelova E. et al.: 2012, A&A, 544, A51 (Paper II). Koptelova E.A., Oknyanskij V.L., Shimanovskaya E.V.: 2006, A&A, 452, 37.

Koptelova E.A., Artamonov B.P., Shimanovskaya E.V. et al.: 2007, Astron. Rep., 51, 797.

Koptelova E., Artamonov B.P., Bruevich V.V., Burkhonov O.A., Sergeev A.V.: 2008, Astron. Rep., 52, 270.

Koptelova E., Oknyanskij V.L., Artamonov B.P., Burkhonov O.: 2010, MNRAS, 401, 2805 (Paper I).

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Опубліковано

2012-11-15

Номер

Том 25 № 2 (2012)

Розділ

Статті

Ліцензія

Авторське право (c) 2012 Odessa Astronomical Publications

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Відповідно Закону України про авторське право і суміжні права N 3792-XII від 23 грудня 1993 року