Identifying Lensed Quasars and Measuring Their Time Delays from Unresolved Light Curves

Bag, Satadru; Shafieloo, Arman; Liao, Kai; Treu, Tommaso

doi:10.3847/1538-4357/ac51cb

Cited by 16 publications

(33 citation statements)

References 55 publications

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“…The posterior distributions for the six time-delay distances (denoted 6D ∆t for simplicity) and four angular diameter distances to the lenses (denoted 4D d ) are available at the H0LiCOW website 1 . For more works in cosmology by using strong lensing time delays, we refer the reader to the literature (Ding et al 2021;Bag et al 2022;Sonnenfeld 2021;Liao 2021;Rathna Kumar et al 2015).…”

Section: Observational Quasar Data and Methodologymentioning

confidence: 99%

Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars

Liu

Cao

et al. 2022

A&A

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In this paper we use a newly compiled sample of ultra-compact structure in radio quasars and strong gravitational lensing systems with quasars acting as background sources to constrain six spatially flat and non-flat cosmological models (ΛCDM, PEDE, and DGP). These two sets of quasar data (time-delay measurements of six strong lensing systems and 120 intermediate-luminosity quasars calibrated as standard rulers) could break the degeneracy between the cosmological parameters (H 0 , Ω m , and Ω k ), and therefore provide more stringent cosmological constraints for the six cosmological models we study. A joint analysis of the quasar sample provides model-independent measurements of the Hubble constant H 0 , which are strongly consistent with that derived from the local distance ladder by the SH0ES collaboration in the ΛCDM and PEDE model. However, in the framework of the DGP cosmology (especially for a flat universe), the measured Hubble constant is in good agreement with that derived from the recent Planck 2018 results. In addition, our results show that zero spatial curvature is supported by the current lensed and unlensed quasar observations and that there is no significant deviation from a flat universe. For most of the cosmological models we study (flat ΛCDM, non-flat ΛCDM, flat PEDE, and non-flat PEDE), the derived matter density parameter is completely consistent with Ω m ∼ 0.30 in all the data sets, as expected based on the latest cosmological observations. Finally, according to the statistical deviance information criterion (DIC), the joint constraints provide substantial observational support to the flat PEDE model; however, they do not rule out dark energy being a cosmological constant and non-flat spatial hypersurfaces.

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Section: Observational Quasar Data and Methodologymentioning

confidence: 99%

Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars

Liu

Cao

et al. 2022

A&A

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show abstract

“…The distances posterior distributions for six time delay distances (denoted as "6D ∆t " for simplicity) and four angular diameter distances to the lenses (denoted as "4D d " for simplicity) are available on the website of H0LiCOW 1 . For more works in cosmology by using strong lensing time delays, we refer the reader to see the literature (Ding et al 2021;Bag et al 2022;Sonnenfeld 2021;Liao 2021;Rathna Kumar et al 2015).…”

Section: Observational Quasar Data and Methodologymentioning

confidence: 99%

Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars

Liu¹,

Cao²,

Li³

et al. 2022

Preprint

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In this paper, we use a newly compiled sample of ultra-compact structure in radio quasars and strong gravitational lensing systems with quasars acting as background sources to constrain six spatially flat and non-flat cosmological models (ΛCDM, PEDE and DGP). These two sets of quasar data (the time-delay measurements of six strong lensing systems and 120 intermediate-luminosity quasars calibrated as standard rulers) could break the degeneracy between cosmological parameters (H 0 , Ω m and Ω k ) and therefore provide more stringent cosmological constraints for the six cosmological models we study. A joint analysis of the quasar sample provides model-independent estimations of the Hubble constant H 0 , which is strongly consistent with that derived from the local distance ladder by SH0ES collaboration in the ΛCDM and PEDE model. However, in the framework of a DGP cosmology (especially for the flat universe), the measured Hubble constant is in good agreement with that derived from the the recent Planck 2018 results. In addition, our results show that zero spatial curvature is supported by the current lensed and unlensed quasar observations and there is no significant deviation from a flat universe. For most of cosmological model we study (the flat ΛCDM, non-flat ΛCDM, flat PEDE, and non-flat PEDE models), the derived matter density parameter is completely consistent with Ω m ∼ 0.30 in all the data sets, as expected by the latest cosmological observations. Finally, according to the the statistical criteria DIC, although the joint constraints provide substantial observational support to the flat PEDE model, they do not rule out dark energy being a cosmological constant and non-flat spatial hypersurfaces.

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“…Very recently, variability-based methods, which are particularly useful for discovering strongly lensed variable sources, have gained momentum and will undoubtedly play a crucial role in the ongoing and upcoming time-domain surveys (e.g. Kostrzewa-Rutkowska et al 2018;Chao et al 2020Chao et al , 2021Shu et al 2021;Bag et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Holismokes

Shu

Cañameras

Schuldt

et al. 2022

A&A

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We carry out a search for strong-lens systems containing high-redshift lens galaxies with the goal of extending strong-lensing-assisted galaxy evolutionary studies to earlier cosmic time. Two strong-lens classifiers are constructed from a deep residual network and trained with datasets of different lens-redshift and brightness distributions. We classify a sample of 5 356 628 pre-selected objects from the Wide-layer fields in the second public data release of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) by applying the two classifiers to their HSC gri-filter cutouts. Cutting off at thresholds that correspond to a false positive rate of 10−3 on our test set, the two classifiers identify 5468 and 6119 strong-lens candidates. Visually inspecting the cutouts of those candidates results in 735 grade-A or B strong-lens candidates in total, of which 277 candidates are discovered for the first time. This is the single largest set of galaxy-scale strong-lens candidates discovered with HSC data to date, and nearly half of it (331/735) contains lens galaxies with photometric redshifts above 0.6. Our discoveries will serve as a valuable target list for ongoing and scheduled spectroscopic surveys such as the Dark Energy Spectroscopic Instrument, the Subaru Prime Focus Spectrograph project, and the Maunakea Spectroscopic Explorer.

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Identifying Lensed Quasars and Measuring Their Time Delays from Unresolved Light Curves

Cited by 16 publications

References 55 publications

Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars

Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars

Revising the Hubble constant, spatial curvature and dark energy dynamics with the latest observations of quasars

Holismokes

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