Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-17
Astrophys.J.587:71-79,2003
Astronomy and Astrophysics
Astrophysics
AAS LaTeX, 5 PostScript figures
Scientific paper
10.1086/368076
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.
Abajas Cristina
Alcalde David
Aslan Zeki
Bikmaev Ilfan
Chavushyan Vahram
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