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Optical Polarization and Line Variability in Quasars with Associated Absorption

Published online by Cambridge University Press:  12 April 2016

T. Aldcroft ,
J. Bechtold ,
P. Smith ,
C. Foltz  and
G. Schmidt
T. Aldcroft
Affiliation:
Smithsonian Astrophysical Observatory, Cambridge MA 02138
J. Bechtold
Affiliation:
Steward Observatory, Univ. of Arizona, Tucson AZ 85721
P. Smith
Affiliation:
Steward Observatory, Univ. of Arizona, Tucson AZ 85721
C. Foltz
Affiliation:
Steward Observatory, Univ. of Arizona, Tucson AZ 85721
G. Schmidt
Affiliation:
Steward Observatory, Univ. of Arizona, Tucson AZ 85721

Abstract

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The physical origin of associated absorption lines (zabs ≈ zqso) which are observed in radio-loud quasar is generally not well understood. Two observable properties, line variability and quasar optical polarization, can serve to constrain the possibilities. To this end, we have obtained high-resolution spectra (1 Å) and broad-band optical polarizations for over 30 radio-loud quasars with known CIV associated absorption. The quasars are at redshifts between about 1 and 2, and were previously observed spectroscopically at similar resolution between 1985 – 1986 by Foltz et al (1987). The associated CIV absorption systems include a variety of velocity profiles from weak single lines to very complex multi-component systems to the BAL-like profile of PHL 1157+0128. In this poster we show the first strong evidence for line variability in z > 1 radio-loud quasars. We find that in general the variability is less than ~ 30%. The optical polarization of CIV absorbed quasars is consistent with all radio-loud quasars.

Type
Part 15. Poster Papers
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 681 - 682
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

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Hamann, F., et al., 1994, BAAS, 184, #11.07 Google Scholar