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Below the Lyman Edge: UV Polarimetry of Quasars

Published online by Cambridge University Press:  12 April 2016

Anuradha Koratkar ,
Robert Goodrich  and
Robert Antonucci
Anuradha Koratkar
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218
Robert Goodrich
Affiliation:
California Association for Research in Astronomy, W.M. Keck Observatory, P.O. Box 220, 65–1120 Mamalahoa Highway, Kamuela, HI 96743
Robert Antonucci
Affiliation:
Physics Department, University of California, Santa Barbara, CA 93106

Abstract

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The Lyman edge at 912Å is an important diagnostic region for studying quasi-stellar objects (QSOs). In particular, it reveals a great deal about the physical conditions within the atmospheres of accretion disks, a ubiquitous component of QSO theories. Observations of the Lyman edge regions of QSOs have shown scant evidence for the predicted features – few QSOs show the broad, partial Lyman edges expected to be common according to most theories. The FOS in its polarimetry mode has been instrumental in studying the Lyman edge region in QSOs. One of the most exciting discoveries is that the polarization rises, not at wavelengths longward of the Lyman edge, but at wavelengths well below it! Here we present the status of polarimetry observations at the Lyman edge and discuss their implications to accretions disks

Type
Part 15. Poster Papers
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 747 - 748
Copyright
Copyright © Astronomical Society of the Pacific 1997

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