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

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dc.creatorNakos, Th.
dc.creatorCourbin, F.
dc.creatorPoels, J.
dc.creatorLibbrecht, C.
dc.creatorMagain, P.
dc.creatorSurdej, J.
dc.creatorManfroid, J.
dc.creatorBurud, I.
dc.creatorHjorth, J.
dc.creatorGermany, L.
dc.creatorLidman, C.
dc.creatorMeylan, G.
dc.creatorPompei, E.
dc.creatorPritchard, J.
dc.creatorSaviane, I.
dc.date2005-07-07
dc.date.accessioned2026-07-07T11:57:13Z
dc.date.available2026-07-07T11:57:13Z
dc.descriptionWe 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
dc.descriptionAccepted for publication in Astronomy & Astrophysics; 8 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0507164
dc.identifierhttp://arxiv.org/abs/astro-ph/0507164
dc.identifierAstron.Astrophys.441:443-450,2005
dc.identifierdoi:10.1051/0004-6361:20052877
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205807
dc.subjectAstrophysics
dc.titlePhotometric monitoring of the doubly imaged quasar UM673: possible evidence for chromatic microlensing
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