Results 51 to 60 of about 81,623 (245)
Imprints of the super-Eddington accretion on the quasar clustering
, 2017 Super-Eddington mass accretion has been suggested as an efficient mechanism to grow supermassive black holes (SMBHs). We investigate the imprint left by the radiative efficiency of the super-Eddington accretion process on the clustering of quasars using ...
Enoki, Motohiro +7 more
core +1 more source
SDSS J094604.90+183541.8: A Gravitationally Lensed Quasar at z=4.8
, 2010 We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red galaxy, but the SDSS spectrum ...
Abazajian +48 more
core +1 more source
On the Formation of the First Quasars [PDF]
Publications of the Astronomical Society of Australia, 2017 AbstractObservations of the most luminous quasars at redshiftz> 6 reveal the existence of numerous supermasssive black holes (>199M⊙) already in place about 12 billion years ago. In addition, the interstellar medium of the galaxies hosting these black holes are observed to be chemically mature systems, with metallicities (Z> Z⊙) and dust ...
Rosa, Valiante +3 more
openaire +5 more sources
Philosophy Kitchen, 2021 Intervista a Mauro ...
Mauro Folci, Stefano Oliva, Guido Baggio
doaj +1 more source
Large SDSS quasar groups and their statistical significance
, 2015 We use a volume-limited sample of quasars in the Sloan Digital Sky Survey (SDSS) DR7 quasar catalog to identify quasar groups and address their statistical significance.
Einasto, Maret +4 more
core +1 more source
Quasar clustering: evidence for an increase with redshift and implications for the nature of AGNs [PDF]
, 1997 The evolution of quasar clustering is investigated with a new sample of 388 quasars with 0 ...
Bellenger R. +17 more
core +3 more sources
Quasars Probing Quasars. II. The Anisotropic Clustering of Optically Thick Absorbers around Quasars [PDF]
The Astrophysical Journal, 2007 With close pairs of quasars at different redshifts, a background quasar sightline can be used to study a foreground quasar's environment in absorption. We used a sample of 17 Lyman limit systems with column density N_HI > 10^19 cm^-2 selected from 149 projected quasar pair sightlines, to investigate the clustering pattern of optically thick ...
Joseph F. Hennawi, Jason X. Prochaska
openaire +3 more sources
Discovery of spectacular quasar-driven superbubbles in red quasars
Science Advances, 2023 Quasar-driven outflows on galactic scales are a routinely invoked ingredient for galaxy formation models. We report the discovery of ionized gas nebulae surrounding three luminous red quasars at z ~ 0.4 from Gemini integral field unit observations.
Lu Shen +9 more
openaire +3 more sources
Fermentation, 2023 The process of producing sustainable aviation fuel (SAF) from organic waste involves the use of volatile fatty acids (VFAs) as intermediates that are obtained via arrested anaerobic digestion (AAD) and VFA recovery.
Xumeng Ge +3 more
doaj +1 more source
The Luminosity Dependence of Quasar Clustering
, 2005 We investigate the luminosity dependence of quasar clustering, inspired by numerical simulations of galaxy mergers that incorporate black hole growth. These simulations have motivated a new interpretation of the quasar luminosity function.
Adam Lidz +8 more
core +1 more source