Results 81 to 90 of about 18,849 (212)
The Astrophysical JournalDual active galactic nuclei (AGNs), a phase in some galaxy mergers during which both central supermassive black holes (SMBHs) are active, are expected to be a key observable stage leading up to SMBH mergers.
Arran C. Gross +10 more
doaj +1 more source
Correlations of Quasar Optical Spectra with Radio Morphology
, 2011 (Abridged) With the largest homogeneous quasar sample with optical spectra and robust radio morphology classifications assembled to date, we investigate quasar radio and optical properties with unprecedented statistical power.
Ivezić, Željko +3 more
core +1 more source
Evidence for Photoionization Driven Broad Absorption Line Variability [PDF]
, 2015 We present a qualitative analysis of the variability of quasar broad absorption lines using the large multi-epoch spectroscopic dataset of the Sloan Digital Sky Survey Data Release 10. We confirm that variations of absorption lines are highly coordinated
Ferland, Gary +3 more
core +3 more sources
Journal of the American Ceramic Society, Volume 108, Issue 12, December 2025.Development of cordierite lattice structures from DIW of silicone‐based emulsions, in multiple forms (aqueous phase as suspension of oxide nanoparticles, as solution of Mg and Al salts, or as solution/suspension). Abstract The development of advanced ceramic materials with tailored microstructures is essential for meeting the demands of many high ...
Valeria Diamanti +3 more
wiley +1 more source
High-resolution double morphology of the most distant known radio quasar at z=6.12
, 2008 Context: The highest redshift quasars at z>~6 receive considerable attention since they provide strong constraints on the growth of the earliest supermassive black holes.
Becker +26 more
core +1 more source
Journal of Applied Clinical Medical Physics, Volume 26, Issue 11, November 2025.Abstract Purpose OXRAY, a state‐of‐the‐art radiation therapy system commercialized by Hitachi High‐Tech Ltd. in 2023, integrates unique beam delivery and image‐guided radiation therapy (IGRT) technologies as the successor to Vero4DRT. This study evaluated the performance of this second‐generation O‐ring‐shaped linear accelerator. Methods The percentage
Kohei Kawata +8 more
wiley +1 more source
Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
, 2019 We report initial results from a large Gemini program to observe z>~5.7 quasars with GNIRS near-IR spectroscopy. Our sample includes 50 quasars with simultaneous ~0.85-2.5 micron spectra covering the rest-frame ultraviolet and major broad emission lines ...
Banados, Eduardo +14 more
core +1 more source
A Sample of Quasars with Strong Nitrogen Emission Lines from the Sloan Digital Sky Survey [PDF]
, 2008 We report on 293 quasars with strong NIV] lambda 1486 or NIII] lambda 1750 emission lines (rest-frame equivalent width > 3 \AA) at 1.7 < z < 4.0 selected from the Sloan Digital Sky Survey (SDSS) Fifth Data Release.
Fan, Xiaohui +2 more
core +2 more sources
The radio time delay in the double quasar 0957 + 561
The Astrophysical Journal, 1992 Gravitational lens models for the double quasar 0957+561 predict that there should be a time delay of roughly 1 year between the arrival of wave fronts from the two images. In order to measure this delay, the flux densities were monotored at λ = 6 cm of 0957+561A and 0957+561B since 1979.
J. Lehar +3 more
openaire +1 more source
Comparative evaluation of volume and helical four‐dimensional computed tomography using canon system
Journal of Applied Clinical Medical Physics, Volume 26, Issue 11, November 2025.Abstract Background Four‐dimensional computed tomography (4DCT) is an advanced imaging technique designed to capture anatomical motion over time, enabling more accurate evaluation of tumor and organ motion owing to respiration, while minimizing motion‐related artifacts.
Changhwan Kim +9 more
wiley +1 more source