High-Redshift Quasar Formation and Host Galaxy Dynamics
Summary
The emergence of luminous accreting supermassive black holes within the first billion years of cosmic history marks a pivotal epoch in galaxy evolution. High-redshift quasars, detected at redshifts z>6, require the rapid formation of massive early black hole seeds and sustained accretion near the Eddington limit to attain masses of order 10^9 M⊙ in under 700 Myr. Their host galaxies exhibit vigorous star formation and complex dynamics, with typical dynamical masses that often lie below local black hole–galaxy scaling relations. Feedback from quasar-driven winds and radiation shapes the interstellar medium, driving high-velocity outflows that regulate further growth. Simultaneously, absorption by the surrounding intergalactic medium encodes the tail end of cosmic reionization, revealing large spatial fluctuations in ionisation and early metal enrichment. Understanding these interlinked processes provides key constraints on the co-evolution of the first black holes and their galactic environments, and informs models of structure formation on the largest scales.
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High-Redshift Quasar Formation and Host Galaxy Dynamics publication trend
The graph below shows the total number of articles in high-redshift quasar formation and host galaxy dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
High-redshift quasar: A quasar at redshift z>6, observed when the Universe was less than a billion years old.
Eddington ratio: The ratio of an object’s luminosity to its theoretical Eddington luminosity, indicating accretion efficiency.
Rest-frame optical emission line: Spectral lines emitted at optical wavelengths in the source’s rest frame, shifted to infrared by cosmic expansion.
Integral field spectroscopy: A technique that obtains spatially resolved spectra across a two-dimensional field, revealing detailed kinematics and composition.
Cosmic reionization: The phase in the early Universe when the first luminous sources ionised intergalactic hydrogen, ending the cosmic “dark ages.”
References
- Quasars and the Intergalactic Medium at Cosmic Dawn. Annual Review of Astronomy and Astrophysics (2023).
- A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of z > 6.5 Quasars Using JWST. The Astrophysical Journal Letters (2023).
- GA-NIFS: Black hole and host galaxy properties of two z ≃ 6.8 quasars from the NIRSpec IFU. Astronomy & Astrophysics (2023).
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