Time delay in QSO 0957+561 from 1984-99 optical data

Details Time delay in QSO 0957+561 from 1984-99 optical data Time delay in QSO 0957+561 from 1984-99 optical data

2001-02-07

arxiv.org/abs/astro-ph/0102112v1

Astronomy and Astrophysics

Astrophysics

27 pages including 10 tables and 5 color figures. Accepted for publication in ApJ

Scientific paper

10.1086/320462

Photometric optical data of QSO 0957+561 covering the period 1984-99 are analyzed to discern between the two values of the time delay (417 and 424 days) mostly accepted in the recent literature. The observations, performed by groups from three different institutions-Princeton University, Harvard-Smithsonian Center for Astrophysics, and Instituto de Astrofisica de Canarias-and including new unpublished 1998-9 data from the IAC80 Telescope, were obtained in five filters (V, R, I, g, and r). The different light curves have been divided into observational seasons and two restriction have been applied to better calculate the time delay: (i) points with a strange photometric behavior have been removed; and (ii) data sets without large gaps have been selected. Simulated data were generated to test several numerical methods intended to compute the time delay. The methods giving the best results-the discrete correlation function, delta-square, z-transformed discrete correlation function, and linear interpolation-were then applied to real data. A first analysis of the 23 different time delays derived from each technique shows that the time delay must be into the interval 420-424 days. From our statistical study, a most probable value of 422.6 +/- 0.6 days is inferred.

Affiliated with

Also associated with

No associations

Rating

Time delay in QSO 0957+561 from 1984-99 optical data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Time delay in QSO 0957+561 from 1984-99 optical data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time delay in QSO 0957+561 from 1984-99 optical data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-461306