Results 41 to 50 of about 2,139,047 (199)
A Left and Right Truncated Schechter Luminosity Function for Quasars
Galaxies, 2017 The luminosity function for quasars (QSOs) is usually fitted by a Schechter function. The dependence of the number of quasars on the redshift, both in the low and high luminosity regions, requires the inclusion of a lower and upper boundary in the ...
Lorenzo Zaninetti
doaj +1 more source
THE FINAL SDSS HIGH-REDSHIFT QUASAR SAMPLE OF 52 QUASARS AT z > 5.7 [PDF]
, 2016 We present the discovery of nine quasars at identified in the Sloan Digital Sky Survey (SDSS) imaging data. This completes our survey of quasars in the SDSS footprint.
Linhua Jiang +16 more
semanticscholar +1 more source
Redshifts and lens profile for the double quasar QJ 0158-4325 [PDF]
Astronomy & Astrophysics, 2009 Research Note, Accepted for publication in A& ...
Faure C. +7 more
openaire +3 more sources
Ionized Gas Outflows from the MAGNUM Survey: NGC 1365 and NGC 4945
Frontiers in Astronomy and Space Sciences, 2017 AGN feedback, acting through strong outflows accelerated in the nuclear region of AGN hosts, is invoked as a key ingredient for galaxy evolution by many models to explain the observed BH-galaxy scaling relations.
Giacomo Venturi +11 more
doaj +1 more source
Constraining Ω0 with the Angular Size-Redshift Relation of Double-lobed Quasars in the FIRST Survey [PDF]
, 1997 In previous attempts to measure cosmological parameters from the angular size-redshift (θ-z) relation of double-lobed radio sources, the observed data have generally been consistent with a static Euclidean universe rather than with standard Friedmann ...
A. Buchalter +3 more
semanticscholar +1 more source
A Close-Separation Double Quasar Lensed by a Gas-rich Galaxy [PDF]
The Astronomical Journal, 2000 In the course of a Cycle 8 snapshot survey, we have discovered that the z=1.565 quasar HE 0512-3329 is a double with image separation 0.644", almost certainly due to gravitational lensing. The two components differ in brightness by only 0.4 magnitudes and a high signal-to-noise ground-based composite optical spectrum shows no trace of any stellar ...
Gregg, Michael D. +7 more
openaire +2 more sources
The double quasar Q2138-431: detection of a lensing galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT This paper reviews the question of whether the wide separation double quasar Q2138-431 is a gravitational lens. From early work, the two quasar images are known to have almost identical spectra and redshifts, but no lensing galaxy has so far been detected.
openaire +2 more sources
Gravitationally lensed quasars in Gaia – II. Discovery of 24 lensed quasars [PDF]
, 2018 We report the discovery, spectroscopic confirmation and preliminary characterisation of 24 gravitationally lensed quasars identified using Gaia observations.
C. Lemon +3 more
semanticscholar +1 more source
Journal of Vinyl and Additive Technology, EarlyView.Adjusting extrusion variables are a key to balance the flame retardancy and mechanical properties of polyolefin/leather waste fiber composites. ABSTRACT The extrusion processing variables represent a key to the optimal use of additives and thus the development of flame‐retardant polymer composites. Adjusting the property profile, for example, finding a
Guadalupe Sanchez‐Olivares +3 more
wiley +1 more source
First In Vivo 23Na Human Imaging at 10.5 T Using a Combined Sodium‐Proton Transceiver Body Array
Magnetic Resonance in Medicine, Volume 95, Issue 4, Page 2429-2441, April 2026.ABSTRACT Purpose To demonstrate the first in vivo human 23Na MRI at 10.5 T using a novel dual‐tuned transceiver body array and to evaluate a self‐gating approach for respiratory motion compensation, focusing on renal imaging. Methods A custom‐built eight‐channel 23Na‐loop 1H‐dipole transceiver array was designed, constructed, and characterized.
Simon Schmidt +2 more
wiley +1 more source