Statistics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248...58w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 1, 1991, p. 58-73. Research supported by Univ
Statistics
12
Absorption Spectra, Galactic Rotation, Quasars, Faraday Effect, Lyman Alpha Radiation, Metallicity, Red Shift
Scientific paper
The origin of the extragalactic component of QSO Faraday rotation measure (RRM) is reconsidered in light of recent advances in the knowledge of QSO absorption and rotation measure. Kronberg and Perry suggested that there is a correlation between strong metal-line absorption and high rotation measure. Following this suggestion Welter, Perry and Kronberg analyzed the redshift dependence of the RRMs of 116 QSOs and concluded that the most likely origin of the observed RRM was extended galactic haloes or intragroup/cluster gas. This enabled them to set limits on magnetic fields in QSOs, intervening galaxies and clusters, and possibly even in the early universe. Because of the importance of these results, this question is reexamined. Using the latest data on the clouds of the Ly-alpha forest, it is shown that their line-of-sight averaged magnetic fields would have to be more than an order of magnitude above the equipartition value if they were the origin of the observed QSO RRMs: they are therefore ruled out. Turning to metal-line systems, the sample of QSOs for which both accurate RRMs and high-resolution absorption-line data are available is expanded and revised as a result of new observations. Within the restriction of small-number statistics, it is confirmed that RRM probably arises within the metal-line systems and not wihtin the QSOs.
Perry Judith J.
Watson Alan M.
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