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

We 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 an...

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Bibliographic Details
Published in:arXiv.org 2002-10
Main Authors: Colley, Wesley N, Schild, Rudolph E, Abajas, Cristina, Alcalde, David, Aslan, Zeki, Bikmaev, Ilfan, Chavushyan, Vahram, Chinarro, Luis, Cournoyer, Jean-Philippe, Crowe, Richard, Dudinov, Vladimir, Kathinka, Anna, Evans, Dalland, Young-Beom Jeon, Goicoechea, Luis J, Golbasi, Orhan, Khamitov, Irek, Kjernsmo, Kjetil, Lee, Hyun Ju, Lee, Jonghwan, Lee, Ki Won, Lee, Myung Gyoon, Lopez-Cruz, Omar, Mediavilla, Evencio, Moffatt, Anthony F J, Mujica, Raul, Ullan, Aurora M, Oscoz, Alexander, Park, Myeong-Gu, Purves, Norman, Nail Sakhibullin, Sinelnikov, Igor, Stabell, Rolf, Stockton, Alan, Teuber, Jan, Thompson, Roy, Hwa-Sung Woo, Zheleznyak, Alexander
Format: Article
Language:English
Subjects:
Brightness
Observatories
Quasars
Response time
Time lag
Variation
Online Access:Get full text
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Summary:We 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.
ISSN:2331-8422
DOI:10.48550/arxiv.0210400