Around the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar II: Results for the second observing season

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dc.creatorColley, Wesley N.
dc.creatorSchild, Rudolph E.
dc.creatorAbajas, Cristina
dc.creatorAlcalde, David
dc.creatorAslan, Zeki
dc.creatorBikmaev, Ilfan
dc.creatorChavushyan, Vahram
dc.creatorChinarro, Luis
dc.creatorCournoyer, Jean-Philippe
dc.creatorCrowe, Richard
dc.creatorDudinov, Vladimir
dc.creatorKathinka, Anna
dc.creatorEvans, Dalland
dc.creatorJeon, Young-Beom
dc.creatorGoicoechea, Luis J.
dc.creatorGolbasi, Orhan
dc.creatorKhamitov, Irek
dc.creatorKjernsmo, Kjetil
dc.creatorLee, Hyun Ju
dc.creatorLee, Jonghwan
dc.creatorLee, Ki Won
dc.creatorLee, Myung Gyoon
dc.creatorLopez-Cruz, Omar
dc.creatorMediavilla, Evencio
dc.creatorMoffatt, Anthony F. J.
dc.creatorMujica, Raul
dc.creatorUllan, Aurora M.
dc.creatorOscoz, Alexander
dc.creatorPark, Myeong-Gu
dc.creatorPurves, Norman
dc.creatorSakhibullin, Nail
dc.creatorSinelnikov, Igor
dc.creatorStabell, Rolf
dc.creatorStockton, Alan
dc.creatorTeuber, Jan
dc.creatorThompson, Roy
dc.creatorWoo, Hwa-Sung
dc.creatorZheleznyak, Alexander
dc.date2002-10-17
dc.date.accessioned2026-07-07T11:08:08Z
dc.date.available2026-07-07T11:08:08Z
dc.descriptionWe report on an observing campaign in March 2001 to monitor the brightness of the later arriving Q0957+561 B image in order to compare with the previously published brightness observations of the (first arriving) A image. The 12 participating observatories provided 3543 image frames which we have analyzed for brightness fluctuations. From our classical methods for time delay determination, we find a 417.09 +/- 0.07 day time delay which should be free of effects due to incomplete sampling. During the campaign period, the quasar brightness was relatively constant and only small fluctuations were found; we compare the structure function for the new data with structure function estimates for the 1995--6 epoch, and show that the structure function is statistically non-stationary. We also examine the data for any evidence of correlated fluctuations at zero lag. We discuss the limits to our ability to measure the cosmological time delay if the quasar's emitting surface is time resolved, as seems likely.
dc.descriptionAAS LaTeX, 5 PostScript figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0210400
dc.identifierhttp://arxiv.org/abs/astro-ph/0210400
dc.identifierAstrophys.J.587:71-79,2003
dc.identifierdoi:10.1086/368076
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190035
dc.subjectAstrophysics
dc.titleAround the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar II: Results for the second observing season
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