2009/03/05 by D. Paraficz, Danuta Paraficz, J. Hjorth +3 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Stellar, planetary, and galactic studies #astro-ph.CO
paper · pdf · doi:10.1051/0004-6361/200811387
published as Astron.Astrophys. 499 (2009) 395-408 · 16 pages, 30 figures
arxiv created 2009/03/05 · openalex publication_date 2009/03/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present optical <i>R<i/>-band light curves of five SDSS double QSOs (SDSS J0903+5028, SDSS J1001+5027, SDSS J1206+4332, SDSS J1353+1138, SDSS J1335+0118) obtained from monitoring at the Nordic Optical Telescope (NOT) between September 2005 and September 2007. We also present analytical and pixelated modeling of the observed systems. For SDSS J1206+4332, we measured the time delay to be days, which, for a singular isothermal ellipsoid model, corresponds to a Hubble constant of km s<sup>-1<sup/> Mpc<sup>-1<sup/>. Simultaneous pixelated modeling of five other systems for which a time delay has now been previously measured at the NOT leads to <i>H<i/><sub>0<sub/> = km s<sup>-1<sup/> Mpc<sup>-1<sup/>. Finally, by comparing light curves of the two images of each system, suitably shifted by the predicted or observed time-delays, we found no evidence of microlensing variability over the course of the monitoring period.