Spectroscopy and polarimetry of the gravitationally lensed quasar Q0957+561

Abstract

We present new spectroscopic and polarimetric observations of the first discovered gravitational lens Q0957+561 obtained with the 6m telescope of the Special Astrophysical Observatory (SAO, Russia). We explore spectropolarimetric parameters of Q0957+561 A,B components to investigate the innermost structure of the quasar, and explore the nature of polarization in lensed quasars. Additionally, we compare their present-day spectral characteristics with previous observations in order to study long-term spectral changes. We analyze spectral characteristics of lensed quasar comparing spectra of A and B images, as well as comparing previously observed image spectra with present-day ones. The polarization parameters of A-B images are compared. We also model the macro-lens influence on the polarization of the images representing the gravitational lens with a singular isothermal elliptical potential. We find that the brightness and SED ratio of components A and B changed during a long period. Polarization in broad lines of components A and B showed that the equatorial scattering cannot be detected in this quasar. We find wavelength-dependent polarization that may be explained as a combination of the polarization from the disc and outflowing material. There is a significant difference between polarization parameters of the A and B images: the B component shows a higher polarization degree and polarization angle. However, both polarization vectors are nearly perpendicular to the observed radio jet projection. It indicates that the polarization in the continuum is coming from the accretion disc. Our simple lensing model of a polarized source showed that macro-lens can cause the observed differences in polarization parameters of Q0957+561 A,B images. Using Mg II broad line and luminosity of component A we estimated that the Q0957+561 black hole mass is M~(4.8-6.1) $10^8$ M$\odot$

arXiv commentaccepted in AA

References in corpus (60)

• MILES: A Medium resolution INT Library of Empirical Spectra
• Supermassive Black Holes in Active Galactic Nuclei. II. Calibration of the M-sigma Relationship for AGNs
• A Robust Determination of the Time Delay in 0957+561A,B and a Measurement of the Global Value of Hubble's Constant
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• Black Hole Mass Estimates Based on CIV are Consistent with Those Based on the Balmer Lines
• Gravitational Lensing By Spiral Galaxies
• Seyferts on the edge: polar scattering and orientation-dependent polarization in Seyfert 1 nuclei
• Microlensing of the broad line region in 17 lensed quasars
• The Influence of Gravitational Microlensing on the Broad Emission Lines of Quasars
• Multi-wavelength study of the gravitational lens system RXS J1131-1231: III. Long slit spectroscopy: micro-lensing probes the QSO structure
• Microlensing of Quasar Broad Emission Lines: Constraints on Broad Line Region Size
• The Average Size and Temperature Profile of Quasar Accretion Disks
• The Host Galaxy of the Lensed Quasar Q 0957+561
• Improved Constraints on the Gravitational Lens Q0957+561. II. Strong Lensing
• Technique of Polarimetric Observations of Faint Objects at the 6-m BTA Telescope
• Spectropolarimetry of Seyfert 1 galaxies with equatorial scattering: Black hole masses and Broad Line Region characteristics
• The structure of the Mg II broad line emitting region in Type 1 AGNs
• Time delay measurement of Mg II line in CTS C30.10 with SALT
• Polarization change due to fast winds from accretion disks
• Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
• AGN Black hole mass estimates using polarization in broad emission Lines
• Variability in Spectropolarimetric properties of Sy 1.5 galaxy Mrk 6
• Microlensing of a Biconical Broad Line Region
• Around the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar II: Results for the second observing season
• Quasar Microlensing Variability Studies Favor Shallow Accretion Disk Temperature Profiles
• Polarization in lines - a new method for measuring black hole masses in active galaxies
• New two-colour light curves of Q0957+561: time delays and the origin of intrinsic variations
• Time delay in QSO 0957+561 from 1984-99 optical data
• Microlensing and Intrinsic Variability of the Broad Emission Lines of Lensed Quasars
• The 6 cm Light Curves of B0957+561, 1979-1994: New Features and Implications for the Time Delay
• Microlensing of the X-ray, UV and optical emission regions of quasars: Simulations of the time-scales and amplitude variations of microlensing events
• New aperture photometry of QSO 0957+561; application to time delay and microlensing
• A reassessment of the data and models of the gravitational lens Q0957+561
• The buried Balmer-edge signatures from quasars
• A New Microlensing Event in the Doubly-Imaged Quasar Q0957+561
• Size of the accretion disk in the gravitationally lensed quasar SDSS J1004+4112 from the statistics of microlensing magnifications
• New database for a sample of optically bright lensed quasars in the northern hemisphere
• Improved Constraints on the Gravitational Lens Q0957+561. I. Weak Lensing
• Systematic Redshift of the Fe III UV Lines in Quasars. Measuring Supermassive Black Hole Masses under the Gravitational Redshift Hypothesis
• A First Close Look at the Balmer-edge Behavior of the Quasar Big Blue Bump
• The influence of gravitational lensing on the spectra of lensed QSOs
• Spectroscopy and polarimetry of the gravitationally lensed quasar SDSS J1004+4112 with the 6m SAO RAS telescope
• Constraining the geometry and kinematics of the quasar broad emission line region using gravitational microlensing. I. Models and simulations
• Microlensing of Broad Absorption Line Quasars: Polarization Variability
• Spectropolarimetric monitoring of active galaxy 3C390.3 with 6m telescope SAO RAS in the period 2009-2014
• The intraday variations of polarization vector direction in radio source S5 0716+714
• VLBI Observations of the Gravitational Lens System 0957+561
• Accretion Disc Structure and Orientation in the Lensed and Microlensed Q0957+561 Quasar
• Polarization microlensing in the quadruply imaged broad absorption line quasar H1413+117
• Estimating supermassive black hole masses in AGNs using polarization of broad MgII, H$\alpha$ and H$\beta$ lines
• Measuring Supermassive Black Hole Masses: Correlation between the Redshifts of the Fe III UV Lines and the Widths of Broad Emission Lines
• A 5.5-year robotic optical monitoring of Q0957+561: substructure in a non-local cD galaxy
• Revealing the nonlinear behaviour of the lensed quasar Q0957+561
• Q0957+561 revised: CO emission from a disk at z=1.4
• 'Round the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar
• Resolving the Structure at the Heart of BAL Quasars Through Microlensing Induced Polarisation Variability
• Structure function of the UV variability of Q0957+561
• New constraints on quasar broad absorption and emission line regions from gravitational microlensing
• Spectroscopy of the Lens Galaxy of Q0957+561A,B. Implications of a possible central massive dark object
• The Central Component of Gravitational Lens Q0957+561

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