Photometric monitoring of the doubly imaged quasar UM673: possible evidence for chromatic microlensing

Details Photometric monitoring of the doubly imaged quasar UM673: possible evidence for chromatic microlensing Photometric monitoring of the doubly imaged quasar UM673: possible evidence for chromatic microlensing

2005-07-07

arxiv.org/abs/astro-ph/0507164v1

Astron.Astrophys.441:443-450,2005

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomy & Astrophysics; 8 pages, 7 figures

Scientific paper

10.1051/0004-6361:20052877

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 magnitude 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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