Multi-phase investigation of outflows in the circumgalactic and interstellar media of luminous quasars at z~5

Abstract

Aims. Outflows from active galactic nuclei are invoked as the principal feedback process regulating the co-evolution of supermassive black holes and their host galaxies. Because of their multi-phase and multi-scale nature, an exhaustive description of these winds should exploit multiple tracers. However, connecting various outflow features remains a challenge. The aim of this work is to provide a complete characterisation of outflows in a sample of z$\sim$5 quasars, by exploiting the combination of different emission and absorption tracers. Methods. We analysed the UV/optical and FIR continuum, line emission, and absorption in a sample of 39 z$\sim$5 quasars observed with VLT/X-Shooter and ALMA (available for six objects). We identified broad and narrow absorption lines associated with the quasar and emission lines to determine black hole masses and bolometric luminosities. Results. Our sample encompasses massive (log($M_{\text{BH,MgII}}/M_{\odot }$) = 8.5-10) and luminous (log($L_{\text{bol}}$/(erg/s)) = 46.9-48) quasars at redshift 5-5.7. They display powerful ionised outflows detected in both emission and absorption, with velocities exceeding 48,000 km/s in some cases, and lie above the local black hole - host galaxy mass relation, exhibiting a behaviour similar to that of z$\gtrsim$6 quasars. These findings suggest a phase of efficient black hole feedback occurring at redshift z$\gtrsim$6 and likely persisting down to z$\sim$5, characterised by rapid black hole growth exceeding that of the host galaxy. The fraction of quasars with outflow detections in absorption is higher for larger CIV-MgII velocity shifts, suggesting that while the physical mechanisms powering the two outflow phenomena detected in emission and absorption may differ, a correlation exists between them.

19 pages, 14 figures. Accepted for publication in A&A

References in corpus (18)

• A Catalog of Quasar Properties from SDSS DR7
• A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
• Very extended cold gas, star formation and outflows in the halo of a bright QSO at z>6
• The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars
• Correcting CIV-Based Virial Black Hole Masses
• Kiloparsec-scale ALMA Imaging of [CII] and Dust Continuum Emission of 27 Quasar Host Galaxies at z~6
• A Census of Intrinsic Narrow Absorption Lines in the Spectra of Quasars at z=2-4
• XQ-100: A legacy survey of one hundred 3.5 < z < 4.5 quasars observed with VLT/XSHOOTER
• The Quasar-frame Velocity Distribution of Narrow CIV Absorbers
• The Metal-Strong Damped Lyman-alpha Systems
• Widespread, strong outflows in XQR-30 quasars at the Reionisation epoch
• New Constraints on Quasar Evolution: Broad Line Velocity Shifts over $1.5\lesssim z\lesssim 7.5$
• The AGNIFS survey: spatially resolved observations of hot molecular and ionised outflows in nearby active galaxies
• AGN feedback in a galaxy merger: Multi-phase, galaxy-scale outflows including a fast molecular gas blob ~6 kpc away from IRAS F08572+3915
• Metals in the z~3 intergalactic medium: results from an ultra-high signal-to-noise ratio UVES quasar spectrum
• The nature of NV absorbers at high redshift
• The host galaxies of radio-loud quasars at z>5 with ALMA
• KBSS-InCLOSE I: Design and First Results from the Inner CGM of QSO Line Of Sight Emitting Galaxies at z~2-3