Time delay and lens redshift for the doubly  imaged BAL 
quasar SBS 1520+530

Burud, I.; Hjorth, J.; Courbin, F.; Cohen, Judith G.; Magain, Pierre; Jaunsen, A. O.; Kaas, A. A.; Fauré, C.; Letawe, Géraldine

doi:10.1051/0004-6361:20020856

Cited by 84 publications

(83 citation statements)

References 12 publications

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“…Figure 22 shows the result of the simultaneous modeling of 5 systems with time delays obtained at the NOT. These are RX J0911+055 (Hjorth et al 2002), SBS B1520+530, (Burud et al 2002b), B1600+434 (Burud et al 2000) and J0951+263 (Jakobsson et al 2005) and the time delay of SDSS J1206+4332 reported in this paper. On the histogram the results of our simultaneous modeling of the 5 QSOs are presented.…”

Section: Simultanous Modelingsupporting

confidence: 54%

Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope

Paraficz¹,

Hjorth²,

Elíasdóttir

2009

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We present optical R-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 Δτ = 116 +4 −5 days, which, for a singular isothermal ellipsoid model, corresponds to a Hubble constant of 73 +3 −4 km s −1 Mpc −1 . Simultaneous pixelated modeling of five other systems for which a time delay has now been previously measured at the NOT leads to H 0 = 61.5 +8 −4 km s −1 Mpc −1 . 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.

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Section: Simultanous Modelingsupporting

confidence: 54%

Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope

Paraficz¹,

Hjorth²,

Elíasdóttir

2009

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“…-SBS 1520+530: two data sets exist for this doubly lensed quasar: the set made available by Burud et al (2002b) and the one published by Gaynullina et al (2005a). Burud et al (2002c) were the first to publish a time delay for this system Δt AB = 128 ± 3 days, where A is the leading image, or Δt AB = 130 ± 3 days when using the iterative version of the method . Gaynullina et al (2005b) used an independent data set and found four possible time delays, of which the one with the largest statistical weight, Δt AB = 130.5 ± 2.9, is perfectly consistent with the previously published time delays.…”

Section: Application To 11 Lensed Quasarsmentioning

confidence: 99%

Time delays for eleven gravitationally lensed quasars revisited

Eulaers

Magain

2011

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Aims. We test the robustness of published time delays for 11 lensed quasars by using two techniques to measure time shifts in their light curves. Methods. We chose to use two fundamentally different techniques to determine time delays in gravitationally lensed quasars: a method based on fitting a numerical model and another one derived from the minimum dispersion method introduced by Pelt and collaborators. To analyse our sample in a homogeneous way and avoid bias caused by the choice of the method used, we apply both methods to 11 different lensed systems for which delays have been published: JVAS B0218+357, SBS 0909+523, RX J0911+0551, FBQS J0951+2635, HE 1104-1805, PG 1115+080, JVAS B1422+231, SBS 1520+530, CLASS B1600+434, CLASS B1608+656, and HE 2149-2745 Results. Time delays for three double lenses, JVAS B0218+357, HE 1104-1805, and CLASS B1600+434, as well as the quadruply lensed quasar CLASS B1608+656 are confirmed within the error bars. We correct the delay for SBS 1520+530. For PG 1115+080 and RX J0911+0551, the existence of a second solution on top of the published delay is revealed. The time delays in four systems, SBS 0909+523, FBQS J0951+2635, JVAS B1422+231, and HE 2149-2745 prove to be less reliable than previously claimed. Conclusions. If we wish to derive an estimate of H 0 based on time delays in gravitationally lensed quasars, we need to obtain more robust light curves for most of these systems in order to achieve a higher accuracy and robustness on the time delays.

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“…∆t BD ? ∆t CD 28.6 ± 9.4 JVAS B1422+231 (Patnaik & Narasimha 2001) 15 GHz ∆t AB −1.5 ± 1.4 1.1 ± 2.1 ∆t AC 7.6 ± 2.5 −0.4 ± 3.0 ∆t BC 8.2 ± 2.0 −0.4 ± 3.2 SBS 1520+530 (Burud et al 2002b) R ∆t AB 130 ± 3 124.2 ± 8.1 CLASS B1600+434 (Burud et al 2000) I ∆t AB 51 ± 4 (95% CI) ? CLASS B1600+434 (Koopmans et al 2000) 8.5 GHz ∆t AB 47 +5 77.6 ± 3.5 ∆t CD 41.3 ± 1.6 SDSS J1650+4251 (Vuissoz et al 2007) R ∆t AB 49.5 ± 1.9 59.2 ± 15.9 PKS 1830−211 (Lovell et al 1998) 8.6 GHz ∆t AB 26 +4…”

Section: H 0 From Pixellated Modeling Of Ten Gravitational Lensesmentioning

confidence: 99%

H₀from ten well-measured time delay lenses

Kumar

Stalin

Prabhu

2015

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In this work, we present a homogeneous curve-shifting analysis using the difference-smoothing technique of the publicly available light curves of 24 gravitationally lensed quasars, for which time delays have been reported in the literature. The uncertainty of each measured time delay was estimated using realistic simulated light curves. The recipe for generating such simulated light curves with known time delays in a plausible range around the measured time delay is introduced here. We identified 14 gravitationally lensed quasars that have light curves of sufficiently good quality to enable the measurement of at least one time delay between the images, adjacent to each other in terms of arrival-time order, to a precision of better than 20% (including systematic errors). We modeled the mass distribution of ten of those systems that have known lens redshifts, accurate astrometric data, and sufficiently simple mass distribution, using the publicly available PixeLens code to infer a value of H 0 of 68.1 ± 5.9 km s −1 Mpc −1 (1σ uncertainty, 8.7% precision) for a spatially flat universe having Ω m = 0.3 and Ω Λ = 0.7. We note here that the lens modeling approach followed in this work is a relatively simple one and does not account for subtle systematics such as those resulting from line-of-sight effects and hence our H 0 estimate should be considered as indicative.

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Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530

Cited by 84 publications

References 12 publications

Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope

Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope

Time delays for eleven gravitationally lensed quasars revisited

H₀from ten well-measured time delay lenses

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Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530

Cited by 84 publications

References 12 publications

Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope

Results of optical monitoring of 5 SDSS double QSOs with the Nordic Optical Telescope

Time delays for eleven gravitationally lensed quasars revisited

H0from ten well-measured time delay lenses

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Product

Resources

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H₀from ten well-measured time delay lenses