Reference : Photometric monitoring of the doubly imaged quasar UM 673: possible evidence for chro...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/18756
Photometric monitoring of the doubly imaged quasar UM 673: possible evidence for chromatic microlensing
English
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]
Courbin, F. [Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Sauverny, Switzerland]
Poels, Joël [Université de Liège - ULg > 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 mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Manfroid, Jean mailto [Université de Liège - ULg > 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]
Meylan, G. [Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, 1290 Sauverny, Switzerland]
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]
1-Oct-2005
Astronomy and Astrophysics
EDP Sciences
441
443-450
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] gravitational lensing ; quasars: individual: Q 0142-100 (UM 673)
[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.
http://hdl.handle.net/2268/18756
10.1051/0004-6361:20052877
http://adsabs.harvard.edu/abs/2005A%26A...441..443N
http://de.arxiv.org/abs/astro-ph/0507164
The authors thank EDP Sciences for their deposit authorization

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