[en] 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 Gunn i-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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nakos, Theodoros; European Southern Observatory, Casilla 19001, Santiago, Chile ; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium ; Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
Poels, Joël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Libbrecht, C.; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, Sart Tilman, Bât. B5C, 4000 Liège, Belgium ; Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium
Magain, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Manfroid, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Burud, I.; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Hjorth, J.; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark
Germany, L.; European Southern Observatory, Casilla 19001, Santiago, Chile
Lidman, C.; European Southern Observatory, Casilla 19001, Santiago, Chile
Pompei, E.; European Southern Observatory, Casilla 19001, Santiago, Chile
Pritchard, J.; Mount John University Observatory and Department of Physics & Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand ; Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, København Ø, Denmark ; European Southern Observatory, Casilla 19001, Santiago, Chile
Saviane, I.; European Southern Observatory, Casilla 19001, Santiago, Chile
Daulie, G., Hainaut, O., Hutsemékers, D., et al. 1993, Gravitational lenses in the universe, in 31st Liège International Astrophysical Colloquium, ed. J. Surdej et al., 181
Eigenbrod, A., Courbin, F., Vuissoz, C., et al. 2005, A&A, 436, 25
Lehár, J., Falco, E. E., Kochanek, C. S., et al. 2000, ApJ, 536, 584
Nakos, Th., Ofek, E. O., Boumis, P., et al. 2003, A&A, 402, 1157
Østensen, R., Remy, M., Lindblad, P. O., et al. 1997, A&AS, 126, 393
Phillips, A. C., & Davis, L. E. 1995, Astronomical Data Analysis Software and Systems IV, ed. R. A. Shaw, H. E. Payne, & J. J. E. Hayes, ASP Conf. Ser., 77, 297
Remy, M. 1996, Ph.D. Thesis, Liège University
Sinachopoulos, D., Nakos, Th., Boumis, P., et al. 2001, AJ, 122, 1692
Smette, A., Surdej, J., Shaver, P. A., et al. 1992, ApJ, 389, 39
