Article (Scientific journals)
Acceleration and Substructure Constraints in a Quasar Outflow
Hall, Patrick B; Sadavoy, Sarah I; Hutsemekers, Damien et al.
2007In Astrophysical Journal, 665, p. 174-186
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Keywords :
Galaxies: Quasars: Absorption Lines; Galaxies: Quasars: General; quasars: individual (SDSS J024221.87+004912.6)
Abstract :
[en] We present observations of probable line-of-sight acceleration of a broad absorption trough of C IV in the quasar SDSS J024221.87+004912.6. We also discuss how the velocity overlap of two other outflowing systems in the same object constrains the properties of the outflows. The Si IV doublet in each system has one unblended transition and one transition that overlaps with absorption from the other system. The residual flux in the overlapping trough is well fit by the product of the residual fluxes in the unblended troughs. For these optically thick systems to yield such a result, at least one of them must consist of individual subunits, rather than being a single structure with velocity-dependent coverage of the source. If these subunits are identical, opaque, spherical clouds, we estimate the cloud radius to be r~=3.9×10[SUP]15[/SUP] cm. If they are identical, opaque, linear filaments, we estimate their width to be w~=6.5×10[SUP]14[/SUP] cm. These subunits are observed to cover the Mg II broad emission-line region of the quasar, at which distance from the black hole the above filament width is equal to the predicted scale height of the outer atmosphere of a thin accretion disk. Insofar as that scale height is a natural size scale for structures originating in an accretion disk, these observations are evidence that the accretion disk can be a source of quasar absorption systems. This paper is based on data from ESO program 075.B-0190(A).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hall, Patrick B;  Department of Physics and Astronomy, York University, Toronto, ON M3J 1P3, Canada.
Sadavoy, Sarah I;  Department of Physics and Astronomy, York University, Toronto, ON M3J 1P3, Canada.
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Everett, John E;  Departments of Physics and Astronomy, and Center for Magnetic Self-Organization in Laboratory and Astrophysical Plasmas, University of Wisconsin-Madison, Madison, WI 53706.
Rafiee, Alireza;  Department of Physics and Astronomy, York University, Toronto, ON M3J 1P3, Canada.
Language :
English
Title :
Acceleration and Substructure Constraints in a Quasar Outflow
Publication date :
01 August 2007
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
665
Pages :
174-186
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 March 2010

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