Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745*

Sharon, Keren; Bayliss, M.; Dahle, H.; Florian, Michael; Gladders, Michael D.; Johnson, Traci L.; Paterno-Mahler, Rachel; Rigby, J. Keith; Whitaker, Katherine E.; Wuyts, Eva

doi:10.3847/1538-4357/835/1/5

Cited by 33 publications

(46 citation statements)

References 38 publications

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“…We measure a systemic redshift of =  z 2.8054 0.0004, consistent with our previous measurement fromR 1000 spectra (Sharon et al 2017). Recent studies show that many quasar emission lines have velocities that are biased relative to systemic as measured from stellar features (Shen et al 2016), suggesting that our systemic redshift estimate uncertainty is dominated by systematics on the order of d  z 0.002.…”

Section: Systemic Redshiftsupporting

confidence: 72%

“…Previous papers described the discovery and initial follow-up (Dahle et al 2013), time delay measurements of the three brightest quasar images (Dahle et al 2015), and detailed strong lens modeling (Sharon et al 2017) of SDSSJ2222+2745. Here, we build on previous studies of this source using the lens model from Sharon et al (2017). SDSSJ2222+2745 is at z=2.8, with a luminosity that has recently varied between -L 2 5 10 UV 44 erg s −1 (Dahle et al 2015).…”

Section: Sdssj2222+2745mentioning

confidence: 99%

“…We use HST imaging data from Cycle 21 program GO-13337 (PI: Sharon), described in detail in Sharon et al (2017). Briefly, these data include WFC3/IR imaging in F110W and F160W, and ACS imaging in F435W, F606W, and F814W.…”

Section: Hst Imagingmentioning

confidence: 99%

“…We use the strong-lensing models and methodology described in Sharon et al (2017) to recover lensing-corrected source plane images of the quasar host galaxy using the most highly magnified quasar image (A). We also map the ESI slit into the source plane-shown in Figure 3-which reveals the location from which the extracted host galaxy Lyα emission originates.…”

Section: Source Plane Reconstructionmentioning

confidence: 99%

“…The large separation minimizes the confounding effects of the foreground lens light, and these systems also tend to have high magnifications over a larger area in the source plane, such that the host galaxy is highly magnified out to physical projected radii of several kiloparsecs. Currently, there are only three large separation lensed quasars known: SDSSJ1004 +4112 (Inada et al 2003;Oguri et al 2004;Sharon et al 2005;Fian et al 2016), SDSSJ1029+2623 (Inada et al 2006;Oguri et al 2008Oguri et al , 2013, and SDSSJ2222+2745 (Dahle et al 2013(Dahle et al , 2015Sharon et al 2017). While strong-lensing studies of these systems using HST can provide uniquely high spatial resolution, the technique has been relatively underutilized.…”

Section: Introductionmentioning

confidence: 99%

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Spatially Resolved Patchy Lyα Emission within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8

Bayliss¹,

Sharon²,

Acharyya³

et al. 2017

ApJL

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We report the detection of extended Lyα emission from the host galaxy of SDSSJ2222+2745, a strongly lensed quasar at z=2.8. Spectroscopic follow-up clearly reveals extended Lyα in emission between two images of the central active galactic nucleus (AGN). We reconstruct the lensed quasar host galaxy in the source plane by applying a strong lens model to HST imaging and resolve spatial scales as small as ∼200 pc. In the source plane, we recover the host galaxy morphology to within a few hundred parsecs of the central AGN and map the extended Lyα emission to its physical origin on one side of the host galaxy at radii ∼0.5-2 kpc from the central AGN. There are clear morphological differences between the Lyα and rest-frame ultraviolet stellar continuum emission from the quasar host galaxy. Furthermore, the relative velocity profiles of quasar Lyα, host galaxy Lyα, and metal lines in outflowing gas reveal differences in the absorbing material affecting the AGN and host galaxy. These data indicate the presence of patchy local intervening gas in front of the central quasar and its host galaxy. This interpretation is consistent with the central luminous quasar being obscured across a substantial fraction of its surrounding solid angle, resulting in strong anisotropy in the exposure of the host galaxy to ionizing radiation from the AGN. This work demonstrates the power of strong-lensing-assisted studies to probe spatial scales that are currently inaccessible by other means.

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Section: Systemic Redshiftsupporting

confidence: 72%

Section: Sdssj2222+2745mentioning

confidence: 99%

Section: Hst Imagingmentioning

confidence: 99%

Section: Source Plane Reconstructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatially Resolved Patchy Lyα Emission within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8

Bayliss¹,

Sharon²,

Acharyya³

et al. 2017

ApJL

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Strong-lensing of Gravitational Waves by Galaxy Clusters

et al. 2017

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Discovery of strongly-lensed gravitational wave (GW) sources will unveil binary compact objects at higher redshifts and lower intrinsic luminosities than is possible without lensing. Such systems will yield unprecedented constraints on the mass distribution in galaxy clusters, measurements of the polarization of GWs, tests of General Relativity, and constraints on the Hubble parameter. Excited by these prospects, and intrigued by the presence of socalled "heavy black holes" in the early detections by LIGO-Virgo, we commenced a search for strongly-lensed GWs and possible electromagnetic counterparts in the latter stages of the second LIGO observing run (O2). Here, we summarise our calculation of the detection rate of stronglylensed GWs, describe our review of BBH detections from O1, outline our observing strategy in O2, summarize our follow-up observations of GW170814, and discuss the future prospects of detection.

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New strong lensing modelling of SDSS J2222+2745 enhanced with VLT/MUSE spectroscopy

Acebrón

Grillo

Bergamini

et al. 2022

A&A

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Context. SDSS J2222+2745, at z = 0.489, is one of the few currently known lens clusters with multiple images (six) of a background (z = 2.801) quasar with measured time delays between two image pairs (with a sub-percent relative error for the longer time delay). Systems of this kind can be exploited as alternative cosmological probes through high-precision and accurate strong lensing models. Aims. We present recent observations from the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT) and new total mass models of the core of the galaxy cluster SDSS J2222+2745. Methods. We combine archival multi-band, high-resolution imaging from the Hubble Space Telescope (HST) with our VLT/MUSE spectroscopic data to securely identify 34 cluster members and 12 multiple images from 3 background sources. We also measure the stellar velocity dispersions of 13 cluster galaxies, down to HST F160W = 21 mag, enabling an independent estimate of the contribution of the sub-halo mass component to the lens total mass. By leveraging the new spectroscopic dataset, we build improved strong lensing models. Results. The projected total mass distribution of the lens cluster is best modelled with a single large-scale mass component, a galaxyscale component, anchored by the VLT/MUSE kinematic information, and an external shear component. The best-fit strong lensing model yields a root mean square separation between the model-predicted and observed positions of the multiple images of 0 ′′ .29. When analysing the impact of systematic uncertainties, stemming from modelling assumptions and used observables, we find that the resulting projected total mass profile, the relative weight of the sub-halo mass component, and the critical lines are consistent, within the statistical uncertainties. The predicted magnification and time-delay values are, instead, more sensitive to the local details of the lens total mass distribution, and vary significantly among lens models that are similarly good at reproducing the observed multiple image positions. In particular, the model-predicted time delays can differ by a factor of up to ∼ 1.5. Conclusions. SDSS J2222+2745 is a promising lens cluster for cosmological applications. However, due to its complex morphology, the relatively low number of secure 'point-like' multiple images, and current model degeneracies, it becomes clear that additional information (from the observed surface brightness distribution of lensed sources and the measured time delays) needs to be included in the modelling for accurate and precise cosmological measurements. The full VLT/MUSE secure spectroscopic catalogue presented in this work is made publicly available.

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Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745*

Cited by 33 publications

References 38 publications

Spatially Resolved Patchy Lyα Emission within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8

Spatially Resolved Patchy Lyα Emission within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8

Strong-lensing of Gravitational Waves by Galaxy Clusters

New strong lensing modelling of SDSS J2222+2745 enhanced with VLT/MUSE spectroscopy

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