Modeling the HeII Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration
, 2017 The HeII transverse proximity effect - enhanced HeII Ly{\alpha} transmission in a background sightline caused by the ionizing radiation of a foreground quasar - offers a unique opportunity to probe the emission properties of quasars, in particular the ...
Davies, Frederick B. +5 more
core +1 more source
Changing-look Quasar Candidates: First Results from Follow-up Spectroscopy of Highly Optically Variable Quasars [PDF]
Astrophysical Journal, 2018 Active galactic nuclei (AGNs) that show strong rest-frame optical/UV variability in their blue continuum and broad line emission are classified as changing-look AGN, or at higher luminosities, changing-look quasars (CLQs).
C. MacLeod +17 more
semanticscholar +1 more source
The Subaru high-z quasar survey: discovery of faint z~6 quasars
, 2014 We present the discovery of one or two extremely faint z~6 quasars in 6.5 deg^2 utilizing a unique capability of the wide-field imaging of the Subaru/Suprime-Cam.
Furusawa, Hisanori +11 more
core +1 more source
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars [PDF]
, 2006 We present low-resolution ultraviolet spectra of 14 low redshift ...
Ari Laor +38 more
core +4 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
A Mid-IR Selected Changing-look Quasar and Physical Scenarios for Abrupt AGN Fading [PDF]
Astrophysical Journal, 2018 We report a new changing-look quasar, WISE J105203.55+151929.5 at z = 0.303, found by identifying highly mid-IR-variable quasars in the Wide-field Infrared Survey Explorer (WISE)/Near-Earth Object WISE Reactivation (NEOWISE) data stream.
D. Stern +13 more
semanticscholar +1 more source
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
Quasars and their host galaxies
, 2006 This review attempts to describe developments in the fields of quasar and quasar host galaxies in the past five. In this time period, the Sloan and 2dF quasar surveys have added several tens of thousands of quasars, with Sloan quasars being found to z>6.
A. Laor +81 more
core +2 more sources
Exploring Reionization-era Quasars. III. Discovery of 16 Quasars at 6.4 ≲ z ≲ 6.9 with DESI Legacy Imaging Surveys and the UKIRT Hemisphere Survey and Quasar Luminosity Function at z ∼ 6.7 [PDF]
Astrophysical Journal, 2018 This is the third paper in a series aimed at finding reionization-era quasars with the combination of DESI Legacy imaging Surveys (DELS), the Pan-STARRS1 (PS1) Survey, and near-infrared imaging surveys, such as the UKIRT Hemisphere Survey (UHS), as well ...
Feige Wang +24 more
semanticscholar +1 more source