Results 41 to 50 of about 24,041 (212)
Predicting the Yields of z > 6.5 Quasar Surveys in the Era of Roman and Rubin
The Astrophysical Journal, 2023 About 70 luminous quasars discovered at z > 6.5 are strongly biased toward the bright end, thus not providing a comprehensive view of quasar abundance beyond the cosmic dawn. We present the predicted results of the Roman/Rubin high-redshift quasar survey,
Wei Leong Tee +5 more
doaj +1 more source
Feasibility of a real-time dual energy markerless monitoring of lung tumors using a clinical room-mounted stereoscopic and monoscopic x-ray imaging system. [PDF]
Med PhysAbstract Background The motion of lung tumors during breathing poses challenges in stereotactic body radiotherapy (SBRT), warranting improved monitoring techniques. Breathing complicates SBRT by creating positional uncertainty in the lungs, traditionally managed with PTV margins, respiratory gating, or breath hold, each with significant drawbacks ...
McLure Z, Peacock C, Sattarivand M.
europepmc +2 more sources
On the Formation of the First Quasars [PDF]
Publications of the Astronomical Society of Australia, 2017 AbstractObservations of the most luminous quasars at redshiftz> 6 reveal the existence of numerous supermasssive black holes (>199M⊙) already in place about 12 billion years ago. In addition, the interstellar medium of the galaxies hosting these black holes are observed to be chemically mature systems, with metallicities (Z> Z⊙) and dust ...
Rosa, Valiante +3 more
openaire +5 more sources
Fermentation, 2023 The process of producing sustainable aviation fuel (SAF) from organic waste involves the use of volatile fatty acids (VFAs) as intermediates that are obtained via arrested anaerobic digestion (AAD) and VFA recovery.
Xumeng Ge +3 more
doaj +1 more source
Quasars Probing Quasars. II. The Anisotropic Clustering of Optically Thick Absorbers around Quasars [PDF]
The Astrophysical Journal, 2007 With close pairs of quasars at different redshifts, a background quasar sightline can be used to study a foreground quasar's environment in absorption. We used a sample of 17 Lyman limit systems with column density N_HI > 10^19 cm^-2 selected from 149 projected quasar pair sightlines, to investigate the clustering pattern of optically thick ...
Joseph F. Hennawi, Jason X. Prochaska
openaire +3 more sources
Discovery of spectacular quasar-driven superbubbles in red quasars
Science Advances, 2023 Quasar-driven outflows on galactic scales are a routinely invoked ingredient for galaxy formation models. We report the discovery of ionized gas nebulae surrounding three luminous red quasars at z ~ 0.4 from Gemini integral field unit observations.
Lu Shen +9 more
openaire +3 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
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MEASURING THE TIME DELAYS IN GRAVITATIONALLY LENSED QUASARS IN THE PRESENCE OF MICROLENSING
Radio Physics and Radio Astronomy, 2014 A method to measure the time delays in gravitationally lensed quasars is proposed, which provides a simple and transparent procedure to eliminate the effects of microlensing events.
V. S. Tsvetkova +2 more
doaj +1 more source
Listerin Alleviates Alzheimer's Disease through IRE1‐mediated Decay of TLR4 mRNA
Advanced Science, EarlyView.Alzheimer's disease (AD) progression is influenced by microglia‐mediated neuroinflammation. Here, it is demonstrated that Listerin suppresses neuroinflammatory signaling and cognitive impairment in AD models by triggering IRE1α‐mediated TLR4 mRNA decay. Adenoviral Listerin delivery reduces amyloid‐β pathology, positioning it as a new therapeutic target.
Fei Qin +9 more
wiley +1 more source