Results 131 to 140 of about 117,210 (326)
WITNESSING THE BIRTH OF A QUASAR [PDF]
The Astronomical Journal, 2010 27 pages, 5 figures. Updated references.
Takamitsu Tanaka +2 more
openaire +2 more sources
Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation [PDF]
Monthly notices of the Royal Astronomical Society, 2019 A minority of the optically selected quasar population are red at optical wavelengths due to the presence of dust along the line of sight. A key focus of many red quasar studies is to understand their relationship with the overall quasar population ...
L. Klindt +4 more
semanticscholar +1 more source
Narrow [O iii] Emission Lines as a Potential Proxy for the Evolutionary Stage of Quasars
The Astrophysical JournalRadio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with z ≲ 1 from the Sloan Digital Sky Survey (SDSS).
Zhi-fu Chen +3 more
doaj +1 more source
Statistics of Galactic-scale Quasar Pairs at Cosmic Noon
The Astrophysical Journal, 2023 The statistics of galactic-scale quasar pairs can elucidate our understanding of the dynamical evolution of supermassive black hole (SMBH) pairs, the duty cycles of quasar activity in mergers, or even the nature of dark matter, but they have been ...
Yue Shen +10 more
doaj +1 more source
Environments of Nearby Quasars in Sloan Digital Sky Survey [PDF]
, 2009 For the first time spectroscopic galaxy redshift surveys are reaching the scales where galaxies can be studied together with the nearest quasars. This gives an opportunity to study the dependence between the activity of a quasar and its environment in a more extensive way than before. We study the spatial distribution of galaxies and groups of galaxies
arxiv +1 more source
Quasars Lensed by Globular Clusters of Spiral and Elliptical Galaxies [PDF]
Astron.Lett.33:355-367,2007; Pisma Astron.Zh.33:403-416,2007, 2007 Based on the SDSS catalog, we have found new close quasar-galaxy pairs. Quasars projected onto the halos of nearer galaxies are encountered among the multitude of quasars observed at various distances from us. Among them there are quasars that are close to the galaxies not only in angular separation, but also in redshift.
arxiv +1 more source
Medical Physics, EarlyView.Abstract Background Magnetic resonance imaging (MRI) offers superior soft tissue contrast and essential imaging capabilities for modern medicine. MRI is increasingly being used in applications that require a high degree of spatial fidelity; however, distortions are a well‐known limitation of the modality. The mid‐field (0.3 T ≤ B0 < 1 T) has advantages
Curtis N. Wiens +2 more
wiley +1 more source
Quasars in the COSMOS Field [PDF]
The Astrophysical Journal, 2006 Accepted for publication in ApJ; emulateapj style; 25 pages, 13 figures, 4 ...
Prescott, M. K. M. +3 more
openaire +5 more sources
United European Gastroenterology Journal, EarlyView.ABSTRACT Background Eligibility criteria in clinical trials have been criticised for being overly restrictive without clinical justification. Objective We aimed to investigate the types, evolution, and current status of eligibility criteria in clinical trials for inflammatory bowel diseases (IBD).
An Outtier +7 more
wiley +1 more source
The Astrophysical JournalWe present the optical–near-infrared spectral energy distributions (SED) and near-infrared variability properties of 30 low-redshift iron low-ionization Broad Absorption Line quasars (FeLoBALQs) and matched samples of LoBALQs and unabsorbed quasars ...
Karen M. Leighly +5 more
doaj +1 more source