Gravitationally Lensed Quasar SDSS J1442+4055: Redshifts of Lensing Galaxies, Time Delay, Microlensing Variability, and Intervening Metal System at z ~ 2

Abstract

We present an $r$--band photometric monitoring of the two images A and B of the gravitationally lensed quasar SDSS J1442+4055 using the Liverpool Telescope (LT). From the LT light curves between 2015 December and 2018 August, we derive at once a time delay of 25.0 $\pm$ 1.5 days (1$\sigma$ confidence interval; A is leading) and microlensing magnification gradients below 10${}^{-4}$ mag day${}^{-1}$. The delay interval is not expected to be affected by an appreciable microlensing--induced bias, so it can be used to estimate cosmological parameters. This paper also focuses on new Gran Telescopio Canarias (GTC) and LT spectroscopic observations of the lens system. We determine the redshift of two bright galaxies around the doubly imaged quasar using LT spectroscopy, while GTC data lead to low--noise individual spectra of A, B, and the main lensing galaxy G1. The G1 spectral shape is accurately matched to an early--type galaxy template at $z$ = 0.284, and it has potential for further relevant studies. Additionally, the quasar spectra show absorption by metal--rich gas at $z\sim$ 2. This dusty absorber is responsible for an extinction bump at a rest--frame wavelength of 2209 $\pm$ 2 Å, which has strengths of $\sim$ 0.47 and 0.76 mag $\mu$m${}^{-1}$ for A and B, respectively. In such intervening system, the dust--to--gas ratio, gas--phase metallicity indicator [Zn/H], and dust depletion level [Fe/Zn] are relatively high.

21 pages, 9 figures, 9 tables. The long Tables 1-4 are available at https://grupos.unican.es/glendama/q1442.htm

References in corpus (17)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• H0LiCOW V. New COSMOGRAIL time delays of HE0435-1223: $H_0$ to 3.8% precision from strong lensing in a flat $\Lambda$CDM model
• Microlensing Makes Lensed Quasar Time Delays Significantly Time Variable
• Multi-wavelength study of the gravitational lens system RXS J1131-1231: III. Long slit spectroscopy: micro-lensing probes the QSO structure
• On the HI content, dust-to-gas ratio and nature of MgII absorbers
• Disentangling microlensing and differential extinction in the double QSO HE0512-3329
• Extinction Curves of Lensing Galaxies out to z=1
• The color excess of quasars with intervening DLA systems- Analysis of the SDSS data release five
• Differential X-ray Absorption and Dust-To-Gas Ratios of the Lens Galaxies SBS0909+523, FBQS0951+2635, and B1152+199
• Time delay of SBS 0909+532
• Gravitational lens system SDSS J1339+1310: microlensing factory and time delay
• Extinction properties of lensing galaxies
• Quasar 2175 Å dust absorbers I: metallicity, depletion pattern, and kinematics
• Doubly imaged quasar SDSS J1515+1511: time delay and lensing galaxies
• Quasar 2175 Å dust absorbers II: Correlation analysis and relationship with other absorption line systems
• Resolving the Internal Structure of Circum-Galactic Medium using Gravitationally Lensed Quasars

Cited by in corpus (5)

• COSMOGRAIL XIX: Time delays in 18 strongly lensed quasars from 15 years of optical monitoring
• TDCOSMO II: 6 new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2m telescope
• A 4% measurement of $H_0$ using the cumulative distribution of strong-lensing time delays in doubly-imaged quasars
• TDCOSMO XVII. New time delays in 22 lensed quasars from optical monitoring with the ESO-VST 2.6m and MPG 2.2m telescopes
• Model selection using time-delay lenses