A New Member of the Fast and Furious Family: A Relativistic and Time-Variable UV Outflow in a Luminous Quasar

Abstract

We report the fastest quasar outflow first detected in the ultraviolet, via variable C IV and Si IV absorption at outflow velocities $-77,000$ km s${}^{-1}$ to at least $-90,000$ km s${}^{-1}$, in the radio-quiet quasar SDSS J231854.31+243954.2 (J2318). J2318 is a weak-lined quasar in the rest-frame ultraviolet, but Gemini GNIRS spectroscopy reveals an H$\alpha$ redshift of $z=2.6781\pm 0.0004$. A twenty-year photometric time series shows peak-to-peak variability of 0.5 mag in the $g$ band. The C IV outflow strengthened monotonically over three epochs spanning $\sim$2.2 rest-frame years. The existence of such a high-velocity outflow implies that models of quasar outflows must be able to either accelerate gas to $0.3c$ while still preserving C IV and Si IV ions, or enable the formation of C IV and Si IV ions in gas which has been accelerated to $0.3c$. Virial estimates reveal a black-hole mass of $1.65\times 10^9{M}_{\odot }$, which leads to an Eddington luminosity and Eddington ratio of $2.4\times 10^{47}$ erg s${}^{-1}$ and $0.45$, respectively. Using very conservative assumptions, the UV-absorbing outflow alone has an estimated mass loss of $>0.82M_{\odot }{\mathrm{yr}}^{-1}$ and a kinetic luminosity ratio $L_{kin}/L_{bol}\ge 0.75$%. The lower limit is just above the threshold usually cited for significant feedback on the host galaxy. Comparison to PDS 456, the only other known quasar with a UV-absorbing outflow at $0.3c$, suggests that the true $\dot{M}$ and $L_{kin}/L_{bol}$ could be up to two orders of magnitude larger.

40 pages, 12 figures, 10 tables, published in the Astrophysical Journal

References in corpus (50)

• Gaia Data Release 3: Summary of the content and survey properties
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Initial Performance of the NEOWISE Reactivation Mission
• The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
• A Luminous Quasar at Redshift 7.642
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• Black hole feedback in the luminous quasar PDS 456
• The Sloan Digital Sky Survey Reverberation Mapping Project: Technical Overview
• A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 16
• Mean Spectral Energy Distributions and Bolometric Corrections for Luminous Quasars
• The Many Routes to AGN Feedback
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• The UKIRT Hemisphere Survey: Definition and J-band Data Release
• Active galactic nuclei at z ~ 1.5: I. Spectral energy distribution and accretion discs
• The UV Continuum of Quasars: Models and SDSS Spectral Slopes
• The NewAthena mission concept in the context of the next decade of X-ray astronomy
• The Sloan Digital Sky Survey Reverberation Mapping Project: Rapid CIV Broad Absorption Line Variability
• Spectral Properties From Lyman-alpha to H-alpha For An Essentially Complete Sample of Quasars I: Data
• Detection of Rest-frame Optical Lines from X-shooter Spectroscopy of Weak Emission Line Quasars
• Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
• IPAC Image Processing and Data Archiving for the Palomar Transient Factory
• Supermassive Black Hole Winds in X-rays -- SUBWAYS. I. Ultra-fast outflows in QSOs beyond the local Universe
• The Dependence of C IV Broad Absorption Line Properties on Accompanying Si IV and Al III Absorption: Relating Quasar-Wind Ionization Levels, Kinematics, and Column Densities
• Radiation pressure confinement - IV. Application to broad absorption line outflows
• Structured ionized winds shooting out from a quasar at relativistic speeds
• Line-driven radiative outflows in luminous quasars
• HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame: I. The Most Energetic Outflows in the Universe and Other Discoveries
• On the importance of special relativistic effects in modelling ultra-fast outflows
• The flux ratio of the [N II]$\lambda \lambda$ 6548, 6583 Å lines in sample of Active Galactic Nuclei Type 2
• Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs
• Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
• The SPHEREx Satellite Mission
• Shock-multicloud interactions in galactic outflows -- I. Cloud layers with log-normal density distributions
• The fraction and kinematics of broad absorption line quasars across cosmic time
• Survey of Extremely High-velocity Outflows in Sloan Digital Sky Survey Quasars
• Multi-phase black-hole feedback and a bright [CII] halo in a Lo-BAL quasar at $z\sim 6.6$
• Dynamical thermal instability in highly supersonic outflows
• On the origins of C IV absorption profile diversity in broad absorption line quasars
• The Contribution of Quasar Absorption Outflows to AGN Feedback
• HST/COS Observations of Quasar Outflows in the 500 -- 1050 Å Rest Frame: II The Most Energetic Quasar Outflow Measured to Date
• The evolution of the low-density HI intergalactic medium from z=3.6 to 0: Data, transmitted flux and HI column density
• Shedding New Light on Weak Emission-Line Quasars in the C${}_{\mathrm{IV}}$-H$\beta$ Parameter Space
• Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
• Connection between Emission and Absorption Outflows through the Study of Quasars with Extremely-High Velocity Outflows
• Discovery and characterization of 25 new quasars at 4.6 < z < 6.9 from wide-field multi-band surveys
• Characterising SMSS J2157--3602, the most luminous known quasar, with accretion disc models
• BALQSO Spectra Explained by Shock Disruption of Galactic Clouds