Results 101 to 110 of about 16,078 (195)
Polar Broad Absorption Line Quasars: An Open Question
, 2011 It has been argued that certain broad absorption line quasars are viewed within 35 degrees of the axis of a relativistic radio jet, based on two-epoch radio flux density variability. It is true if the surface brightness of a radio source is observed to change by a sufficiently large amount, the inferred brightness temperature will exceed 10^12 K and ...
Hall, Patrick B., Chajet, Laura S.
openaire +2 more sources
Tracing the massive inflows feeding super-massive black holes in quasars. [PDF]
Innovation (Camb), 2023 Jiang P, Shi X, Zhou H.
europepmc +1 more source
Metal-Enriched Outflows in the Ultra-Luminous infrared Quasar Q1321+058
, 2009 Quasar outflows may play important role in the evolution of its host galaxy and central black hole. In this paper, we present a detailed study of multiple outflows in the obscured ultra-luminous infrared quasar Q1321+058.
Baldwin +51 more
core +1 more source
The Sloan Digital Sky Survey Reverberation Mapping Project: Velocity Shifts of Quasar Emission Lines
, 2016 Quasar emission lines are often shifted from the systemic velocity due to various dynamical and radiative processes in the line-emitting region. The level of these velocity shifts depends both on the line species and on quasar properties.
Brandt, W. N. +11 more
core +3 more sources
Reorienting Our Perspective of Broad Absorption Line Quasars
, 2012 Proceedings from the conference "AGN Winds in Charleston", October ...
DiPompeo, Michael A. +3 more
openaire +2 more sources
The Quasar-associated 2175 Å Dust Absorbers in the SDSS DR16 Quasar Catalog
The Astrophysical Journal Supplement SeriesWe present, for the first time, a systematic study of quasar-associated 2175 Å dust absorbers using spectroscopic data from the Sloan Digital Sky Survey Data Release 16 (DR16).
Shaohua Zhang +6 more
doaj +1 more source
The Astrophysical JournalWe present a multiepoch spectroscopic study of the broad absorption line (BAL) quasar J115636.82+085628.9 ( z _em = 2.1077), based on five spectra spanning nearly two decades in the observer’s frame.
P. Aromal +4 more
doaj +1 more source
Circumnuclear Gas of a Quasar in Absorption and Emission Lines
The Astrophysical JournalWe present a detailed analysis of the unusual absorption- and emission-line spectrum of the quasar SDSS J074850.39+442439.0 (hereafter J0748+4424) at a redshift of z = 2.18. The archival SDSS optical spectrum is abundant in narrow absorption lines (NALs)
Xuejie Dai +12 more
doaj +1 more source
The Astrophysical JournalFlows driven by photons have been studied for almost a century, and a quantitative description of the radiative forces on atoms and ions is important for understanding a wide variety of systems with outflows and accretion disks, such as active galactic ...
Aylecia S. Lattimer, Steven R. Cranmer
doaj +1 more source
EPJ Web of Conferences, 2013 In 2008 the flat spectrum radio quasar GB6 J1239+0443 (z=1.762), underwent an high activity period at all wavelengths. In particular, at optical-uv wavelengths, the source underwent a flux enhancement of a factor 15–30 in 6 years, and >10 in half a year,
Pacciani Luigi +3 more
doaj +1 more source