Evolution and explosions of metal enriched supermassive stars: Proton rich general relativistic instability supernovae [PDF]
Monthly notices of the Royal Astronomical Society, 2023 The assembly of supermassive black holes poses a challenge primarily because of observed quasars at high redshift, but additionally because of the current lack of observations of intermediate mass black holes.
Chris Nagele, H. Umeda, Koh Takahashi
semanticscholar +1 more source
Estimating black hole spin from AGN SED fitting: The impact of general-relativistic ray tracing [PDF]
Monthly notices of the Royal Astronomical Society, 2023 Accretion disc model fitting to optical/UV quasar spectra requires that the highest mass black holes have the highest spin, with implications on the hierarchical growth of supermassive black holes and their host galaxies over cosmic time.
S. Hagen, C. Done
semanticscholar +1 more source
Cosmic ray generation by quasar remnants: constraints and implications [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 The quasar remnant cores of nearby giant elliptical galaxies NGC 4486 (M87), NGC 1399, NGC 4649 and NGC 4472 are the sites of supermassive (greater than one billion solar masses) black holes. These objects are investigated as to the viability of the conjecture that they could harbor compact dynamos capable of generating the highest energy cosmic rays ...
Boldt, Elihu, Loewenstein, Michael
openaire +2 more sources
Fundamental differences in the radio properties of red and blue quasars: kiloparsec-scale structures revealed by e-MERLIN [PDF]
, 2021 Red quasi-stellar objects (QSOs) are a subset of the quasar population with colours consistent with reddening due to intervening dust. Recent work has demonstrated that red QSOs show special radio properties that fundamentally distinguish them from ...
D. Rosario +7 more
semanticscholar +1 more source
Peculiar emission line spectra of core extremely red BOSS quasars at z∼2–3: orientation and/or evolution? [PDF]
Astronomy & Astrophysics, 2020 Context. Core extremely red quasars (core ERQ) have been proposed to represent an intermediate evolutionary phase in which a heavily obscured quasar blows out the circumnuclear interstellar medium with very energetic outflows before it becomes an optical
M. Martín +7 more
semanticscholar +1 more source
Constraining the ratio of median pixel optical depth profile around z ∼ 4 quasars using the longitudinal proximity effect [PDF]
, 2021 We present a detailed study of the longitudinal proximity effect using a sample of 85 quasars spanning an emission redshift range of 3.5 6 zem 6 4.5 and Lyman continuum luminosity (L912) ranging from 1.06×10 31 to 2.24×10 erg s Hz.
P. Jalan, H. Chand, R. Srianand
semanticscholar +1 more source
Extreme Quasars as Distance Indicators in Cosmology [PDF]
, 2020 Quasars accreting matter at very high rates (known as extreme Population A [xA] quasars, possibly associated with super-Eddington accreting massive black holes) may provide a new class of distance indicators covering cosmic epochs from present day up to ...
Marziani, Paola +23 more
core +1 more source
Photometric redshifts for quasars from WISE-PS1-STRM
, 2022 Three-dimensional wide-field galaxy surveys are fundamental for cosmological studies. For higher redshifts (z > 1.0), where galaxies are too faint, quasars still trace the large-scale structure of the Universe.
Szapudi, István +3 more
core +1 more source
A new binning method to choose a standard set of Quasars [PDF]
Physics of the Dark UniverseAlthough the Lambda Cold Dark Matter model is the most accredited cosmological model, information at intermediate redshifts (z) between type Ia Supernovae (z = 2.26) and the Cosmic Microwave Background (z = 1100) is crucial to validate this model further.
M. Dainotti +6 more
semanticscholar +1 more source
The nature of low-luminosity AGNs discovered by JWST based on clustering analysis: Progenitors of low-z quasars? [PDF]
Monthly notices of the Royal Astronomical SocietyJames Webb Space Telescope (JWST) has discovered many faint AGNs at high-z by detecting their broad Balmer lines. However, their high number density, lack of X-ray emission, and overly high black hole masses with respect to their host stellar masses ...
Junya Arita +6 more
semanticscholar +1 more source