Results 161 to 170 of about 382 (184)
Multispectral live-cell imaging with uncompromised spatiotemporal resolution
Kumar A +12 more
europepmc +1 more source
The intrinsic fraction of broad-absorption line quasars [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We carefully reconsider the problem of classifying broad absorption line quasars (BALQSOs) and derive a new, unbiased estimate of the intrinsic BALQSO fraction from the SDSS DR3 QSO catalogue. We first show that the distribution of objects selected by the so-called ``absorption index'' (AI) is clearly bimodal in log(AI), with only one mode ...
Simone Scaringi, Christian Knigge
exaly +4 more sources
A variable P舁v broad absorption line and quasar outflow energetics [PDF]
Monthly Notices of the Royal Astronomical Society, 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. The viability of BAL outflows as a feedback mechanism depends on their kinetic energies, as derived from the outflow velocities, column densities, and distances from the central ...
F Hamann
exaly +4 more sources
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Are radio‐loud Broad Absorption Line Quasars young sources?
Astronomische Nachrichten, 2009AbstractStudying Broad Absorption Line Quasars (BAL QSOs) is interesting because they probe the physics of the AGN environment, and because AGN outflows are important ingredients in many recent astrophysical puzzles. In the last decade, a substantial population of radio BAL QSOs was discovered and we have started a characterisation of the radio‐loud ...
Montenegro-Montes, F. M. +6 more
openaire +2 more sources
Broad Absorption Line Quasars: An Overview
1995We review recent dynamical models proposed to explain the high velocity outflows seen in Broad Absorption Line Quasars (BAL QSOs). The arguments leading to the “confinement problem” are reviewed and the way with which these recent models attempt to deal with this problem discussed.
openaire +1 more source
Radio Loud Broad Absorption Line Quasars
2009This thesis is concerned with Broad Absorption Line Quasars (BAL QSOs). At the moment it is not clear how many quasars host outflows and why these can only be seen in a fraction of the quasar population. The most popular hypotheses proposed to explain this mainly differ in the role given to orientation.
openaire +1 more source
Fraction of broad absorption line quasars in different radio morphologies
Monthly Notices of the Royal Astronomical Society, 2022M Vivek
exaly