Results 91 to 100 of about 111,241 (293)
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
SDSS J094604.90+183541.8: A Gravitationally Lensed Quasar at z=4.8
, 2010 We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red galaxy, but the SDSS spectrum ...
Abazajian +48 more
core +1 more source
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XIII: Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231 [PDF]
, 2013 We present the results from nine years of optically monitoring the gravitationally lensed z=0.658 quasar RX J1131-1231. The R-band light curves of the four individual images of the quasar were obtained using deconvolution photometry for a total of 707 ...
A. M. Mosquera +61 more
core +2 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
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
The Quasar Main Sequence Explained by the Combination of Eddington Ratio, Metallicity, and Orientation [PDF]
Astrophysical Journal, 2019 We address the effect of orientation of the accretion disk plane and the geometry of the broad-line region (BLR) as part of an effort to understand the distribution of quasars in optical plane of the quasar main sequence.
S. Panda, P. Marziani, B. Czerny
semanticscholar +1 more source
Chemistry &Biodiversity, EarlyView.ABSTRACT Volatile secondary metabolites in plants can serve as valuable biomarkers for the plant's health, stress response, and pest or disease detection. We have investigated the volatilome of Acer saccharum (sugar maple) leaves using two complementary extraction techniques: headspace‐solid phase micro‐extraction coupled with gas chromatography‐mass ...
Jean‐Christophe Séguin +2 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
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
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