Article (Scientific journals)
The use of gravitational microlensing to scan the structure of BAL QSOs
Hutsemekers, Damien; Surdej, Jean; van Drom, E.
1994In Astrophysics and Space Science, 216, p. 361-365
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Keywords :
ABSORPTION SPECTRA; ASTRONOMICAL SPECTROSCOPY; GAS FLOW; GRAVITATIONAL LENSES; INTERSTELLAR GAS; LINE SPECTRA; QUASARS; STELLAR GRAVITATION; STELLAR MODELS; STELLAR SPECTRA; CARBON; MAGNETOHYDRODYNAMIC FLOW; PLASMA JETS; SILICON; STELLAR WINDS
Abstract :
[en] Approximately 10% of the quasi-stellar objects (QSOs) show broad absorption lines (BAL) in their spectra which, if interpreted in terms of Doppler velocities, reveal the presence of high velocity gas outflows. One of these BAL QSOs is known to be gravitationally lensed. It therefore constitutes a good candidate to search for microlensing effects, i.e., the selective amplification of different line forming regions. Considering current models for the BAL region, we have investigated the effects of moving microlenses on the line profiles, and we conclude that these effects strongly depend on the adopted model. A regular spectroscopic monitoring of lensed BAL QSOs would therefore be highly valuable to distinguish between the various models proposed so far to interpret the origin of broad absorption lines.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
van Drom, E.;  Univ. de Liege, Liege, Belgium
Language :
English
Title :
The use of gravitational microlensing to scan the structure of BAL QSOs
Publication date :
01 June 1994
Journal title :
Astrophysics and Space Science
ISSN :
0004-640X
eISSN :
1572-946X
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
Volume :
216
Pages :
361-365
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 March 2010

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