New near-infrared observations and lens-model constraints for UM673

Koptelova, E.; Chiueh, Tzihong; Chen, W. P.; Chan, H. H.

doi:10.1051/0004-6361/201322230

Cited by 5 publications

(7 citation statements)

References 65 publications

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“…Lagattuta, Auger, & Fassnacht (2010) analysed the quad B0128+437 by iteratively fitting a PSF modelled as three Gaussian components, together with the lensing galaxy modelled with a Sersic profile. Koptelova et al (2014) modelled the PSF for a lensed double by using a hybrid composed of the observed brightness distribution of the bright image at the centre, and analytical wings.…”

Section: Techniques Used In the Literaturementioning

confidence: 99%

“…There is enough information (e.g., Marshall et al 2007) in the multiple images of a lensed system to reconstruct the PSF. In this paper, we combined the approach of Lagattuta, Auger, & Fassnacht (2010) and Koptelova et al (2014) into a new technique, by adopting an analytical PSF model and simultaneously optimising for the global PSF parameters as well as the individual objects comprising the system: multiple point sources, and the lensing galaxy modelled as a Sersic profile convolved with the PSF. Where possible, we take an additional step where we refine this fit by using a hybrid PSF (Section 3.4).…”

Section: Modelling With An Analytical Psfmentioning

confidence: 99%

“…This is due to large noise in the wing of the "actual PSF". Therefore, we used another approach, previously employed by Koptelova et al (2014). This consists in using the observed brightness distribution of the bright image only in its central regions, and replacing the wings after a certain cut radius with analytical wings from the 2 Moffat fit (panels h-i in Figure 5).…”

Section: Hybrid Psfmentioning

confidence: 99%

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Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey

Rusu

Oguri

Minowa

et al. 2016

Mon. Not. R. Astron. Soc.

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We present the results of an imaging observation campaign conducted with the Subaru Telescope adaptive optics system (IRCS+AO188) on 28 gravitationally lensed quasars and candidates (23 doubles, 1 quad, 1 possible triple and 3 candidates) from the SDSS Quasar Lens Search. We develop a novel modelling technique that fits analytical and hybrid point spread functions (PSFs), while simultaneously measuring the relative astrometry, photometry, as well as the lens galaxy morphology. We account for systematics by simulating the observed systems using separately observed PSF stars. The measured relative astrometry is comparable with that typically achieved with the Hubble Space Telescope, even after marginalizing over the PSF uncertainty. We model for the first time the quasar host galaxies in 5 systems, without a-priory knowledge of the PSF, and show that their luminosities follow the known correlation with the mass of the supermassive black hole. For each system, we obtain mass models far more accurate than those previously published from low-resolution data, and we show that in our sample of lensing galaxies the observed light profile is more elliptical than the mass, for ellipticity 0.25. We also identify eight doubles for which the sources of external and internal shear are more reliably separated, and should therefore be prioritized in monitoring campaigns aimed at measuring time-delays in order to infer the Hubble constant.

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Section: Techniques Used In the Literaturementioning

confidence: 99%

Section: Modelling With An Analytical Psfmentioning

confidence: 99%

Section: Hybrid Psfmentioning

confidence: 99%

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Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey

Rusu

Oguri

Minowa

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Adaptive optics observations may also improve the information about the structure of the lens system, and deep NIR images are valuable diagnostic tools. In particular, a new deep image in the H band could reveal details about the brightness profile of G and the galaxy field around SDSS J1339+1310 (e.g., Koptelova et al 2014, and references therein). These H-band data may be used to look for galaxies in the vicinity of G, adequately study the galaxy clustering, and estimate its associated convergence/shear.…”

Section: Discussionmentioning

confidence: 99%

“…A discussion on the origin of the external shear requires accurate data of the galaxy field around SDSS J1339+1310 (see recent papers by Anguita et al 2009;MacLeod et al 2009;Goicoechea & Shalyapin 2010;Wong et al 2011;Koptelova et al 2014). There are no SDSS galaxies within a 20 radius circle around the lens system (≤130 kpc at z ∼ 0.6).…”

Section: Lens Modelsmentioning

confidence: 99%

Deep optical imaging and spectroscopy of the lens system SDSS J1339+1310

Shalyapin

Goicoechea

2014

A&A

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We present deep I-band imaging (NOT-ALFOSC) and spectroscopic (GTC-OSIRIS) observations of the gravitational lens system SDSS J1339+1310. This consists of two images of a lensed quasar, A and B, and a lensing galaxy G between the two quasar images. Our observations led to the following main results: (1) We obtained new accurate positions for B and G (relative to A), as well as structure parameters for the light distribution of G. The new position angle for G is separated by ∼50 • from the previously determined value. (2) The spectrum of G is typical for early-type galaxies, and we measured its redshift (0.609 ± 0.001) for the first time. (3) We determined the flux ratio B/A for the cores of the emission lines in the two quasar spectra. They were used to constrain the macrolens flux ratio M BA and dust extinction parameters. (4) The continuum flux ratio was appropriately corrected to obtain the microlensing magnification ratio of the continuum μ BA . This μ BA indicates that B is amplified (relative to A) by a factor of about 3−5, with larger amplifications at shorter wavelengths. The observed microlensing chromaticity coincides with a sharp drop in the r-band flux of B.(5) We reconstructed the lensing mass from the new observational constraints on the relative astrometry, M BA and the luminous structure of G. We also used the redshift of G to predict the time delay between quasar images (43 ± 5 d, A is leading).

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Probing the small-scale structure of the intergalactic medium with ESPRESSO: spectroscopy of the lensed QSO UM673

Cristiani,

Cupani,

Trost

et al. 2024

Monthly Notices of the Royal Astronomical Society

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The gravitationally lensed quasar J014516.6-094517 at z = 2.719 has been observed with the ESPRESSO instrument at the ESO VLT to obtain high-fidelity spectra of the two images A and B with a resolving power R = 70000. At the redshifts under investigation ($2.1\,\,\lesssim \,\,z\,\,\lesssim \,\,2.7$), the Lyman forests along the two sightlines are separated by sub-kiloparsec physical distances and exhibit a strong correlation. We find that the two forests are indistinguishable at the present level of signal-to-noise ratio and do not show any global velocity shift, with the cross-correlation peaking at Δv = 12 ± 48 $\rm m\,\,s^{-1}$. The distribution of the difference in velocity of individual Lyman-α features is compatible with a null average and a mean absolute deviation of 930 $\rm m\,\,s^{-1}$. Significant differences in NHI column density are not detected, putting a limit to the RMS fluctuation in the baryon density on $\,\,\lesssim \,\,1$ proper kpc scales of $\Delta \rho / \rho\,\,\lesssim \,\,3$%. On the other hand, metal lines show significant differences both in velocity structure and in column density. A toy model shows that the difference in velocity of the metal features between the two sightlines is compatible with the the motions of the baryonic component associated to dark matter halos of typical mass M ≃ 2 × 1010M⊙, also compatible with the observed incidence of the metal systems. The present observations confirm the feasibility of the Sandage test of the cosmic redshift drift with high-fidelity spectroscopy of the Lyman forest of distant, bright quasars, but also provide an element of caution about the intrinsic noise associated to the usage of metal features for the same purpose.

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New near-infrared observations and lens-model constraints for UM673

Cited by 5 publications

References 65 publications

Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey

Subaru Telescope adaptive optics observations of gravitationally lensed quasars in the Sloan Digital Sky Survey

Deep optical imaging and spectroscopy of the lens system SDSS J1339+1310

Probing the small-scale structure of the intergalactic medium with ESPRESSO: spectroscopy of the lensed QSO UM673

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