Results 121 to 130 of about 2,405 (218)
A variable P v broad absorption line and quasar outflow energetics [PDF]
, 2014 Broad absorption lines (BALs) in quasar spectra identify high-velocity outflows that might exist in all quasars and could play a major role in feedback to galaxy evolution.
Hamann, F. +2 more
core
X-ray observations of broad absorption-line quasars
The Astrophysical Journal, 1984 The present 0.1-4 keV observer frame data was obtained for three broad absorption-line quasars with the imaging proportional counter on the Einstein Observatory. Data for one object, UM 232, are sufficiently good to tell that absorption at 1 keV is unimportant (quasar rest frame), which leads to an upper limit to the column density of absorbing gas of ...
openaire +1 more source
Near infrared imaging of the broad absorption line quasar BAL QSO 0134+3253
, 2005 In this paper we present near infrared (NIR) imaging data of the host galaxy of the broad absorption line quasar (BALQ) at $z=2.169$, serendipitously found close to 3C 48 (Canalizo et al. 1998, AJ, 115, 890).
J. Zuther, A. Eckart
core +1 more source
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
AllBRICQS: The Discovery of Luminous Quasars in the Northern Hemisphere
The Astrophysical Journal Supplement SeriesWe present the second catalog of bright quasars from the All-sky BRIght, Complete Quasar Survey (AllBRICQS), focusing on spectroscopically observed quasars in the Northern Hemisphere with Galactic latitude ∣ b ∣ > 10°.
Yunyi Choi +18 more
doaj +1 more source
Multiphase Black Hole Feedback and a Bright [C ii] Halo in a LoBAL Quasar at z ∼ 6.6
The Astrophysical JournalAlthough the mass growth of supermassive black holes during the epoch of reionization is expected to play a role in shaping the concurrent growth of their host galaxies, observational evidence of feedback at z ≳ 6 is still sparse.
Manuela Bischetti +20 more
doaj +1 more source
UEG Week 2025 Oral Presentations
United European Gastroenterology Journal, Volume 13, Issue S8, Page S7-S188, October 2025.
wiley +1 more source
The Search for Very High Energy γ-rays from Misaligned AGN [PDF]
, 2013 The aim of this work is to study the potential for emission at very high energies (100 GeV) by misaligned active galactic nuclei (AGN) and the future prospects for observations of these objects with the next generation imaging atmospheric Cherenkov ...
CHEESEBROUGH, ALISTAIR
core
The Astrophysical Journal LettersWe observed the X-ray-bright ultraluminous infrared galaxy IRAS 05189−2524 with XRISM during its performance verification phase. The unprecedented energy resolution of the onboard X-ray microcalorimeter revealed complex spectral features at ∼7–9 keV ...
Hirofumi Noda +19 more
doaj +1 more source
The covering factor of quasar broad absorption line clouds
The Astrophysical Journal, 1988 Two different interpretations of the phenomenon of broad absorption line (BAL) QSOs are presented and a resolution is suggested. One interpretation is that the BAL clouds cover most of the sky as viewed from the quasar; this implies that BALQSOs are an usual subset of the general class of QSOs.
openaire +1 more source