Results 61 to 70 of about 81,623 (245)
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
New Astronomy Reviews, 2000 We propose a simple unifying structure for the inner regions of quasars and AGN. This empirically derived model links together the BALs, the narrow UV/X-ray ionized absorbers, the BELR, and the Compton scattering/fluorescing regions into a single structure. The model also suggests an origin for the large-scale bi-conical outflows.
openaire +5 more sources
Scientific ReportsSeagrasses are undergoing widespread loss due to anthropogenic pressure and climate change. Since 1960, the Mediterranean seascape lost 13–50% of the areal extent of its dominant and endemic seagrass-Posidonia oceanica, which regulates its ecosystem ...
Masuma Chowdhury +8 more
doaj +1 more source
Modeling the HeII Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration
, 2017 The HeII transverse proximity effect - enhanced HeII Ly{\alpha} transmission in a background sightline caused by the ionizing radiation of a foreground quasar - offers a unique opportunity to probe the emission properties of quasars, in particular the ...
Davies, Frederick B. +5 more
core +1 more source
Chemistry–Methods, EarlyView.LaB6 surface modification of PA12 enables efficient NIR diode laser PBF‐LB processing, with enhanced tensile strength and tailored microstructures achieved at minimal additionaly energy. By reducing the need for high filler content, this approach expands the options and performance levels of advanced industrial‐grade polymer additive manufacturing. The
Nadine Stratmann +8 more
wiley +1 more source
ISO Observations of Quasars and Quasar Hosts [PDF]
, 1997 The Infrared Space Observatory (ISO), launched in November 1995, allows us to measure the far-infrared (far-IR) emission of quasars in greater detail and over a wider energy range than previously possible. In this paper, preliminary results in a study of the 5--200 $ m$ continuum of quasars and active galaxies are presented. Comparison of the spectral
openaire +3 more sources
The Astrophysical Journal, 2023 Massive galaxies formed most actively at redshifts z = 1–3 during the period known as “cosmic noon.” Here we present an emission-line study of the extremely red quasar SDSSJ165202.64+172852.3’s host galaxy at z = 2.94, based on observations with the Near
Andrey Vayner +27 more
doaj +1 more source
The Subaru high-z quasar survey: discovery of faint z~6 quasars
, 2014 We present the discovery of one or two extremely faint z~6 quasars in 6.5 deg^2 utilizing a unique capability of the wide-field imaging of the Subaru/Suprime-Cam.
Furusawa, Hisanori +11 more
core +1 more source
3D SR‐μXCT analysis for lithology detection: Application to Ryugu sample A0159
Meteoritics &Planetary Science, EarlyView.Abstract Extraterrestrial breccia samples are formed through impact‐related processes that combine the fragments of distinct lithologies. As such, they are valuable indicators of the complex formation and evolution history of planetesimals in our solar system.
Léna Jossé +9 more
wiley +1 more source
The Physical Relation between Disc and Coronal Emission in Quasars
Frontiers in Astronomy and Space Sciences, 2018 We propose a modified version of the observed non-linear relation between the X-ray (2 keV) and the ultraviolet (2,500 Å) emission in quasars (i.e., LX∝LUVγ) which involves the full width at half-maximum, FWHM, of the broad emission line, i.e., LX∝LUVγ ...
Elisabeta Lusso +2 more
doaj +1 more source