Monitoring of the Einstein Cross with the Nordic Optical Telscope

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dc.creatorOestensen, R.
dc.creatorRefsdal, S.
dc.creatorStabell, R.
dc.creatorTeuber, J.
dc.creatorEmanuelsen, P. I.
dc.creatorFestin, L.
dc.creatorFlorentin-Nielsen, R.
dc.creatorGahm, G.
dc.creatorGullbring, E.
dc.creatorHjorth, J.
dc.creatorJablonski, M.
dc.creatorJaunsen, A. O.
dc.creatorKaas, A. A.
dc.creatorKarttunen, H.
dc.creatorKotilainen, J.
dc.creatorLaurikainen, E.
dc.creatorLindgren, H.
dc.creatorMaehoenen, P.
dc.creatorNilsson, K.
dc.creatorOlofsson, G.
dc.creatorOlsen, Oe.
dc.creatorPettersen, B. R.
dc.creatorPiirola, V.
dc.creatorSoerensen, A. N.
dc.creatorTakalo, L.
dc.creatorThomsen, B.
dc.creatorValtaoja, E.
dc.creatorVestergaard, M.
dc.creatorVianborg, T. av
dc.date1995-12-15
dc.date.accessioned2026-07-07T11:29:46Z
dc.date.available2026-07-07T11:29:46Z
dc.descriptionWe report results from five years of monitoring of the Einstein Cross (Q 2237+0305) with the Nordic Optical Telescope. The photometry, mainly in the R and I bands, has been performed by a PSF fitting and `cleaning' procedure, in which the four image components as well as the lens galaxy and its nucleus are iteratively removed. The resulting lightcurves exhibit several microlensing features; one event may have a timescale as short as 14 days. Variations of timescales of several years are found in all four images. This becomes even more convincing when our data are combined with data published for 1986-89. No clear high amplification event was observed during the period. A brightening of all four components during 1994 is interpreted as intrinsic variation.
dc.description7 pages. To appear in A&A 1996
dc.identifierhttps://arxiv.org/abs/astro-ph/9512103
dc.identifierhttp://arxiv.org/abs/astro-ph/9512103
dc.identifierAstron.Astrophys.309:59-64,1996
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196819
dc.subjectAstrophysics
dc.titleMonitoring of the Einstein Cross with the Nordic Optical Telscope
dc.typetext

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