Results 41 to 50 of about 17,110 (224)
Symposium - International Astronomical Union, 1994 I review recent results for quasars and discuss how they are related to activity in galaxies. Topics included are studies of quasar host galaxies with HST; searches for quasars in the Hubble Deep Field; evolution of the quasar luminosity function; news highlights from astro-ph; and current observational research problems and their relation to ...
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Phylogenetic Analyses of Quasars and Galaxies [PDF]
, 2017 Phylogenetic approaches have proven to be useful in astrophysics. We have recently published a Maximum Parsimony (or cladistics) analysis on two samples of 215 and 85 low-z quasars (z < 0.7) which offer a satisfactory coverage of the Eigenvector 1 ...
Marziani, Paola +11 more
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Direct SMBH Formation Driven by Runaway Stellar Collisions in Globally Unstable Stellar Systems
Astronomische Nachrichten, EarlyView.ABSTRACT The fueling problem addresses the ultimate fate of the reservoirs of gas and stars driven into the deepest gravitational potential wells of galaxies, thus it may contain the Universe's densest concentrations of gas and stars. This raises a key question: does the infalling material collapse directly into a supermassive black hole, or can it ...
Marcelo C. Vergara, Andrés Escala
wiley +1 more source
Red Type-1 Quasars after Cosmic Noon and Impact on L UV-related Quasar Statistics
The Astrophysical JournalOver the past decades, nearly a million quasars have been explored to shed light on the evolution of supermassive black holes and galaxies. The ultraviolet-to-optical spectra of type-1 quasars particularly offer insights into their black hole activities.
Yongjung Kim +3 more
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Histopathology, EarlyView.This meta‐analysis demonstrates that high‐grade tumour budding is an independent prognostic factor in stage II–III colorectal cancer, associated with significantly worse disease‐free survival, overall survival and cancer‐specific survival. Aims Tumour budding (TB) has been recognized as an additional prognostic factor in the TNM (2017) and WHO (2019 ...
Yao Shu +4 more
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On Quasar Masses and Quasar Host Galaxies [PDF]
The Astrophysical Journal, 1998 Accepted for publication in ApJ Letters, 7 pages, aas2pp4 ...
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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 ...
Hennawi, Joseph F., Prochaska, Jason X.
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EW [OIII] as an orientation indicator [PDF]
, 2017 We present an analysis of the average spectral properties of 12,000 SDSS quasars as a function of accretion disk inclination, as measured from the equivalent width of the [O III] 5007Å line. The use of this indicator on a large sample of quasars from the
RISALITI, Guido +3 more
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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
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Pharmacology Research &Perspectives, Volume 14, Issue 5, October 2026.β‐Caryophyllene is a multifunctional sesquiterpene with significant therapeutic potential. Our findings demonstrate that β‐caryophyllene exerts broad hepatoprotective effects through the activation of cannabinoid type 2 (CB2) receptors. These effects include suppression of oxidative stress–induced injury, attenuation of inflammatory responses ...
Lujain Bader Eddin +6 more
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