Статья

Photometric monitoring of the doubly imaged quasar UM 673: possible evidence for chromatic microlensing

Th. NakosEuropean Southern Observatory, Casilla 19001, Santiago, ChileF. CourbinLaboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Sauverny, Switzerland e-mail: [email protected]J. PoelsInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium e-mail: [email protected]C. LibbrechtInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium e-mail: [email protected]Pierre MagainInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium e-mail: [email protected]J. SurdejInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium e-mail: [email protected]Jean ManfroidInstitut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium e-mail: [email protected]I. BurudSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAJ. HjorthNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, DenmarkL. GermanyEuropean Southern Observatory, Casilla 19001, Santiago, ChileC. LidmanEuropean Southern Observatory, Casilla 19001, Santiago, ChileG. MeylanLaboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Sauverny, Switzerland e-mail: [email protected]E. PompeiEuropean Southern Observatory, Casilla 19001, Santiago, ChileJ. D. PritchardEuropean Southern Observatory, Casilla 19001, Santiago, ChileI. SavianeEuropean Southern Observatory, Casilla 19001, Santiago, Chile

2005en

ABI

Аннотация

We present the results of two-band CCD photometric monitoring of the gravitationally lensed quasar Q 0142-100 (UM 673). The data, obtained at ESO-La Silla with the 1.54 m Danish telescope in the -band (October 1998-September 1999) and in the Johnson V-band (October 1998 to December 2001), were analyzed using three different photometric methods. The light-curves obtained with all methods show variations, with a peak-to-peak amplitude of 0.14 mag in V. Although it was not possible to measure the time delay between the two lensed QSO images, the brighter component displays possible evidence for microlensing: it becomes bluer as it gets brighter, as expected under the assumption of differential magnification of a quasar accretion disk.

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Идентификаторы

DOI: 10.1051/0004-6361:20052877

Цитирования и источники

Цитирований: 3Использованных источников: 0

Показатели — AkademScholar