Microlensing makes lensed quasar time delays significantly time variable

Tie, Suk Sien; Kochanek, C. S.

doi:10.1093/mnras/stx2348

Cited by 90 publications

(59 citation statements)

References 56 publications

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“…While V08 were not able to measure the A1-A2 delay, they did constrain the expected range of that delay to −1 > ∆t A1A2:model > −3 days using a series of lens galaxy mass models. While significantly coarser than our measurement of the B-A and B-C delays, the A1-A2 measurement is consistent with the V08 lens models, although this pair will have the largest fractional uncertainties from microlensing-induced variability (Tie & Kochanek 2018). In the present paper, we generate a series of lens galaxy models in which the expected A1-A2 delay is −1.6 > ∆t A1A2(model) > −3.3 days, also consistent with our A1-A2 measurement.…”

Section: Time Delayssupporting

confidence: 65%

Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033–4723

Morgan

Hyer

Bonvin

et al. 2018

ApJ

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We present 13 seasons of R-band photometry of the quadruply-lensed quasar WFI 2033-4723 from the 1.3m SMARTS telescope at CTIO and the 1.2m Euler Swiss Telescope at La Silla, in which we detect microlensing variability of ∼ 0.2 mags on a timescale of ∼6 years. Using a Bayesian Monte Carlo technique, we analyze the microlensing signal to obtain a measurement of the size of this system's accretion disk of log(r s /cm) = 15.86 +0.25 −0.27 at λ rest = 2481Å, assuming a 60 • inclination angle. We confirm previous measurements of the BC and AB time delays, and we obtain a tentative measurement of the delay between the closely spaced A1 and A2 images of ∆t A1A2 = t A1 − t A2 = −3.9 +3.4 −2.2 days. We conclude with an update to the Quasar Accretion Disk Size -Black Hole Mass Relation, in which we confirm that the accretion disk size predictions from simple thin disk theory are too small.Using the polynomial light curve fitting technique of Kochanek et al. (2006), we measured the time delays between the combined image A = A1 + A2, image B and image C.

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Section: Time Delayssupporting

confidence: 65%

Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033–4723

Morgan

Hyer

Bonvin

et al. 2018

ApJ

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“…Even when including dynamical and simulation information, the MSD dominates the uncertainty in strong-lensing measurements of H 0 , as the observed time delays ∆t obs ij are usually well measured (see, however, Ref. [68]).…”

Section: B the Mass-sheet Degeneracymentioning

confidence: 99%

Cosmic time slip: Testing gravity on supergalactic scales with strong-lensing time delays

et al. 2019

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We devise a test of nonlinear departures from general relativity (GR) using time delays in strong gravitational lenses. We use a phenomenological model of gravitational screening as a step discontinuity in the measure of curvature per unit mass, at a radius Λ. The resulting slip between two scalar gravitational potentials leads to a shift in the apparent positions and time delays of lensed sources, relative to the GR predictions, of size γPN − 1. As a proof of principle, we use measurements of two lenses, RXJ1121-1231 and B1608+656, to constrain deviations from GR to be below |γPN − 1| ≤ 0.2 × (Λ/100 kpc). These constraints are complementary to other current probes, and are the tightest in the range Λ = 10 − 200 kpc, showing that future measurements of strong-lensing time delays have great promise to seek departures from general relativity on kpc-Mpc scales.

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“…As the distance scale of the BLR is much greater than the accretion disk, the resultant differential time delay effects are substantially larger than those considered in previous literature (e.g. Yonehara 1999;Goicoechea 2002;Tie & Kochanek 2018).…”

Section: Broad Line Region Reverberation Mappingmentioning

confidence: 82%

“…Computing δτ X to first order in δ ì β, δl s and δ ì θ X , as shown by Tie & Kochanek (2018), gives:…”

Section: Differential Time Delaysmentioning

confidence: 99%

A geometric probe of cosmology – I. Gravitational lensing time delays and quasar reverberation mapping

Lewis

2019

Monthly Notices of the Royal Astronomical Society

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We present a novel, purely geometric probe of cosmology based on measurements of differential time delays between images of strongly lensed quasars due to finite source effects. Our approach is solely dependent on cosmology via a ratio of angular diameter distances, the image separation, and the source size. It thereby entirely avoids the challenges of lens modelling that conventionally limit time delay cosmography, and instead entails the lensed reverberation mapping of the quasar Broad Line Region. We demonstrate that differential time delays are measurable with short cadence spectroscopic monitoring of lensed quasars, through the timing of kinematically identified features within the broad emission lines. This provides a geometric determination of an angular diameter distance ratio complementary to standard probes, and as a result is a potentially powerful new method of constraining cosmology.

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Microlensing makes lensed quasar time delays significantly time variable

Cited by 90 publications

References 56 publications

Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033–4723

Accretion Disk Size Measurement and Time Delays in the Lensed Quasar WFI 2033–4723

Cosmic time slip: Testing gravity on supergalactic scales with strong-lensing time delays

A geometric probe of cosmology – I. Gravitational lensing time delays and quasar reverberation mapping

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