Photometric monitoring of the doubly imaged quasar UM673: possible evidence for chromatic microlensing
arXiv:astro-ph/0507164 · doi:10.1051/0004-6361:20052877
Abstract
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 . 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
arXiv commentAccepted for publication in Astronomy & Astrophysics; 8 pages, 7 figures
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- Time delay between images of the lensed quasar UM673
- I. Flux and color variations of the quadruply imaged quasar HE 0435-1223
- Flux and color variations of the doubly imaged quasar UM673
- Long-term monitoring, time delay and microlensing in the gravitational lens system Q0142-100
- New near-infrared observations and lens-model constraints for UM673