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2013MNRAS.434..222H - Mon. Not. R. Astron. Soc., 434, 222-256 (2013/September-1)
Broad absorption line quasars with redshifted troughs: high-velocity infall or rotationally dominated outflows ?
HALL P.B., BRANDT W.N., PETITJEAN P., PARIS I., FILIZ AK N., SHEN Y., GIBSON R.R., AUBOURG E., ANDERSON S.F., SCHNEIDER D.P., BIZYAEV D., BRINKMANN J., MALANUSHENKO E., MALANUSHENKO V., MYERS A.D., ORAVETZ D.J., ROSS N.P., SHELDEN A., SIMMONS A.E., STREBLYANSKA A., WEAVER B.A. and YORK D.G.
Abstract (from CDS):
We consider several possible ways of generating redshifted absorption. The two most likely possibilities may be at work simultaneously, in the same objects or in different ones. Rotationally dominated outflows seen against a quasar's extended continuum source can produce redshifted and blueshifted absorption, but variability consistent with this scenario is seen in only one of the four objects with multiple spectra. The infall of relatively dense and low-ionization gas to radii as small as 400 Schwarzschild radii can in principle explain the observed range of trough profiles, but current models do not easily explain the origin and survival of such gas. Whatever the origin(s) of the absorbing gas in these objects, it must be located at small radii to explain its large redshifted velocities, and thus offers a novel probe of the inner regions of quasars.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): galaxies: nuclei - quasars: absorption lines - quasars: general
Simbad objects: 52
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