Viewing angle effects in quasar application to cosmology
arXiv:2101.01244 · doi:10.3847/1538-4357/abd775
Abstract
The symmetry axes of active galactic nuclei (AGN) are randomly distributed in space but highly inclined sources are heavily obscured and are not seen as quasars with broad emission lines. The obscuring torus geometry determines the average viewing angle, and if the torus geometry changes with the redshift, this average viewing angle will also change. Thus the ratio between the isotropic luminosity and observed luminosity may change systematically with redshift. Therefore, if we use quasars to measure the luminosity distance by evaluating the isotropic absolute luminosity and measuring the observed flux, we can have a redshift-dependent bias which can propagate to cosmological parameters. We propose a toy model for testing the effect of viewing angle uncertainty on measurement of the luminosity distance. The model is based on analytical description of the obscuring torus applied to one-parameter observational data. It illustrates the possible change of the torus covering factor between the two chosen redshift ranges. We have estimated the possible error on specific cosmological parameters (H0,Omega_m) for the flat Lambda-CDM cosmology if a method is calibrated at low redshift and applied to the higher redshift. The errors on cosmological parameters due to potential dependence of viewing angle on redshift are found to be potentially significant, and the effect will have to be accommodated in the future in all quasar-based cosmological methods. A careful systematic study of AGN mean viewing angle across redshift is necessary, with the use of appropriate samples and models which uniquely determine the inclination of each source.
arXiv comment15 pages, 10 figures, Accepted for publication in ApJ
References in corpus (62)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- Unified Schemes for Radio-Loud Active Galactic Nuclei
- LSST: from Science Drivers to Reference Design and Anticipated Data Products
- The UKIRT Infrared Deep Sky Survey (UKIDSS)
- The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
- Advection-Dominated Accretion: A Self-Similar Solution
- Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
- The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
- A luminous quasar at a redshift of z = 7.085
- Spectral Energy Distributions and Multiwavelength Selection of Type 1 Quasars
- Tensions between the Early and the Late Universe
- H0LiCOW XIII. A 2.4% measurement of from lensed quasars: tension between early and late-Universe probes
- An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
- The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
- Revisiting the Unified Model of Active Galactic Nuclei
- AGN Dusty Tori: II. Observational Implications of Clumpiness
- The Supermassive Black Hole at the Galactic Center
- An X-ray Spectral Model for Compton-Thick Toroidal Reprocessors
- The Expansion of the Universe is Faster than Expected
- Ubiquitous variability of X-ray absorbing column densities in Seyfert 2 Galaxies
- Three years Swift-BAT Survey of AGN: reconciling theory and observations?
- An XMM-Newton spectral survey of 12 micron selected galaxies. I. X-ray data
- Testing thermal reprocessing in AGN accretion discs
- The Sloan Digital Sky Survey quasar catalog: ninth data release
- The origin of the Broad Line Region in Active Galactic Nuclei
- A physical model of the broadband continuum of AGN and its implications for the UV/X relation and optical variability
- A Hubble Diagram for Quasars
- First X-ray-Based Statistical Tests for Clumpy-Torus Models: Eclipse Events from 230 Years of Monitoring of Seyfert AGN
- Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H Time Lags and Implications for Super-Eddington Accretion
- The Sloan Digital Sky Survey Reverberation Mapping Project: H and H Reverberation Measurements From First-year Spectroscopy and Photometry
- New Spectral Model for Constraining Torus Covering Factors from Broadband X-ray Spectra of Active Galactic Nuclei
- Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IX 10 New Observations of Reverberation Mapping and Shortened H Lags
- Tension with the flat ΛCDM model from a high redshift Hubble Diagram of supernovae, quasars and gamma-ray bursts
- A new cosmological distance measure using AGN
- An X-shooter composite of bright 1 < z < 2 quasars from UV to infrared
- Gamma-Ray Burst Hubble Diagram to z=4.5
- The Toroidal Obscuration of Active Galactic Nuclei
- A new direct method for measuring the Hubble constant from reverberating accretion discs in active galaxies
- The Sloan Digital Sky Survey Reverberation Mapping Project: Initial CIV Lag Results from Four Years of Data
- Cosmography and flat CDM tensions at high redshift
- Using quasar X-ray and UV flux measurements to constrain cosmological model parameters
- Photometric AGN reverberation mapping - an efficient tool for BLR sizes, black hole masses and host-subtracted AGN luminosities
- Radiation spectra of warm and optically thick coronae in AGN
- Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
- X-ray spectral and eclipsing model of the clumpy obscurer in active galactic nuclei
- The Sloan Digital Sky Survey Reverberation Mapping Project: MgII Lag Results from Four Years of Monitoring
- The existence of warm and optically thick dissipative coronae above accretion disks
- Is the expansion of the universe accelerating? All signs point to yes
- A new cosmological distance measure using AGN X-ray variability
- Highly accreting quasars: The SDSS low-redshift catalog
- Towards equation of state of dark energy from quasar monitoring: Reverberation strategy
- The Accuracy of the Hubble Constant Measurement Verified through Cepheid Amplitudes
- Cosmological test using the Hubble diagram of high-z quasars
- Astronomical Distance Determination in the Space Age. Secondary distance indicators
- Baryon acoustic oscillations signature in the three-point angular correlation function from the SDSS-DR12 quasar survey
- Cosmological test with the QSO Hubble diagram
- Quasars and their emission lines as cosmological probes
- Nature of Compton-thick Active Galactic Nuclei in "Non-merging'' Luminous Infrared Galaxies UGC 2608 and NGC 5135 Revealed with Broadband X-ray Spectroscopy
- The evolution of dusty torus covering factor in quasars
- Orientation effects on the near-infrared broad band emission of quasars