Статья

TIME DELAY BETWEEN IMAGES OF THE LENSED QUASAR UM673

E. KoptelovaAstronomical observatory of Odessa National University, Odessa, UkraineWen-Ping ChenGraduate Institute of Astronomy, National Central University, Jhongli City, Taoyuan County 320, TaiwanTzihong ChiuehDepartment of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., 106 Taipei, TaiwanБ. П. АртамоновSternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Universitetskii pr. 13, 119992 Moscow, RussiaV. L. OknyanskijSternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Universitetskii pr. 13, 119992 Moscow, RussiaС. Н. НуритдиновUlugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, UzbekistanО. БурхоновUlugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, UzbekistanTalat AkhunovInstitut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, B5c, 4000 Liège, BelgiumВ. В. БруевичSternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Universitetskii pr. 13, 119992 Moscow, RussiaO. V. EzhkovaSternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Universitetskii pr. 13, 119992 Moscow, RussiaА. С. ГусевSternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Universitetskii pr. 13, 119992 Moscow, RussiaA. V. SergeyevInstitute of Radio Astronomy, Krasnoznamennaya 4, 61002 Kharkov, UkraineSh. A. EhgamberdievUlugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, UzbekistanМ. А. ИбрагимовUlugh Beg Astronomical Institute of the Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, Uzbekistan

DOAJ (DOAJ: Directory of Open Access Journals)repository2012en

ABI

Аннотация

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.

Темы

Galaxies: Formation, Evolution, Phenomena Statistical and numerical algorithms Astronomy and Astrophysical Research

Идентификаторы

DOI: 10.18524/1810-4215.2012.25.83310

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