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J/A+A/391/481      R-band photometry of SBS1520+530          (Burud+, 2002)

Time delay and lens redshift for the doubly imaged BAL quasar SBS1520+530 Burud I., Hjorth J., Courbin F., Cohen J.G., Magain P., Jaunsen A.O., Kaas A.A., Faure C., Letawe G. <Astron. Astrophys. 391, 481 (2002)> =2002A&A...391..481B
ADC_Keywords: Gravitational lensing; QSOs; Photometry Keywords: Gravitational lensing - quasars: individual: SBS 1520+530 - cosmological parameters Abstract: We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope, from February 1999 to May 2001. A time delay of 130±3days (1σ) is determined from the light curves. In addition, spectra of SBS 1520+530 obtained at the Keck Observatory are spatially deconvolved in order to extract the spectrum of the faint lensing galaxy, free of any contamination by the light from the bright quasar images. This spectrum indicates a lens redshift z=0.717, in agreement with one of the absorption systems found in the quasar spectra. The best mass model of the system includes a second nearby galaxy and a cluster of galaxies in addition to the main lensing galaxy. Adopting this model and an Ω=0.3, Λ=0.7 cosmology, our time-delay measurement yields a Hubble constant of H0=51±9km/s/Mpc (1σ error). Description: The table lists the data points obtained at the Nordic Optical Telescope used to derive the time delay for the lensed quasar QSO1520+530. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 15 21 44.8 +52 54 49 SBS 1520+530 = SBSG 1520+530 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 48 58 R-band photometry of SBS 1520+530
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 F8.4 mag magA Relative magnitude for image A to the reference star S3 (see Fig. 2 of the paper) 9- 16 F8.4 mag e_magA Error on A mag 17- 25 F9.4 mag magB Relative magnitude for image B to the reference star S3 (see Fig. 2 of the paper) 26- 33 F8.4 mag e_magB Error on B mag 34- 46 F13.2 d JD Julian Date
Acknowledgements: Ingunn Burud
(End) Ingunn Burud [STScI], Patricia Bauer [CDS] 08-Aug-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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