Results 61 to 70 of about 58,921 (147)
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
Meteoritics &Planetary Science, Volume 60, Issue 3, Page 544-569, March 2025.Abstract Refractory inclusions (RIs) in chondrites are widely used as tracers of early solar system formation conditions. In the context of sample‐return missions, a non‐destructive and non‐invasive analytical tool that can rapidly detect and characterize RIs in space samples during their early phase of study is highly needed.
Jean Charlier +4 more
wiley +1 more source
The Clustering of Simulated Quasars [PDF]
AIP Conference Proceedings, 2009 We analyze the clustering properties of quasars simulated using a semianalytic model built on the Millennium Simulation, with the goal of testing scenarios in which black hole accretion and quasar activity are triggered by galaxy mergers. When we select quasars with luminosities in the range accessible by current observations, we find that predicted ...
Silvia Bonoli +2 more
openaire +4 more sources
Towards an Understanding of Changing-Look Quasars: An Archival Spectroscopic Search in SDSS
, 2016 The uncertain origin of the recently-discovered `changing-looking' quasar phenomenon -- in which a luminous quasar dims significantly to a quiescent state in repeat spectroscopy over ~10 year timescales -- may present unexpected challenges to our ...
Anderson, Scott F. +15 more
core +2 more sources
Indentation and Puncturing of Pristine and Flawed Soft Membranes
Fatigue &Fracture of Engineering Materials &Structures, Volume 48, Issue 6, Page 2787-2800, June 2025.ABSTRACT This paper investigates the mechanical behavior of soft elastomeric membranes under indentation by a rigid spherical object, with a particular focus on the failure mechanisms leading to puncture. The study examines both pristine membranes and those with pre‐existing flaws, such as cracks, to explore how these imperfections affect the ...
Matteo Montanari +3 more
wiley +1 more source
Is there a disc in the superluminal quasars? [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 We present a new evidence of the accretion disc in active galactic nuclei, by examining the properties of the Ha emission line versus viewing angle, in a sample of superluminal (SL) quasars. Both line velocity width (FWHM) and rest equivalent width (EW) correlate with viewing angle.
E. Rokaki +6 more
openaire +3 more sources
, 2015 We study the dependence of quasar clustering on quasar luminosity and black hole mass by measuring the angular overdensity of photometrically selected galaxies imaged by WISE about z $\sim$ 0.8 quasars from SDSS.
Eisenstein, Daniel J. +1 more
core +1 more source
Clustering Analyses of 300,000 Photometrically Classified Quasars--II. The Excess on Very Small Scales [PDF]
, 2006 We study quasar clustering on small scales, modeling clustering amplitudes using halo-driven dark matter descriptions. From 91 pairs on scales 2, than at z < 2, at the $2.0\sigma$ level.
Adam D. Myers +8 more
core +2 more sources
Advanced Biology, Volume 9, Issue 5, May 2025.The paper explores the creation and characterization of vesicles through biocatalytic Polymerization‐Induced Self‐Assembly (bioPISA), focusing on achieving size uniformity using centrifugation techniques. It examines the effects of stirring speed on vesicle morphology and analyses the internal polymer‐rich structure using fluorescence correlation ...
Andrea Belluati +7 more
wiley +1 more source
, 2015 The physical mechanisms of the quasar ultraviolet (UV)-optical variability are not well understood despite the long history of observations. Recently, Dexter & Agol presented a model of quasar UV-optical variability, which assumes large local temperature
Kokubo, Mitsuru
core +1 more source