Title: Analysis of Zeeman effect data in radio astronomy
Abstract: view Abstract Citations (29) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Analysis of Zeeman Effect Data in Radio Astronomy Sault, R. J. ; Killeen, N. E. B. ; Zmuidzinas, J. ; Loushin, R. Abstract The analysis of Zeeman effect data in radio astronomy is discussed; in particular, previous techniques are extended to include the case of low signal-to-noise ratios. Three statistical techniques for estimating the line-of-sight magnetic field are considered: maximum likelihood, least-squares, and Wiener filters. For high signal-to-noise ratios, all three estimators are essentially unbiased. It is concluded that, in the poor to moderate signal-to-noise ratio regime, all three estimators are biased; the maximum likelihood technique yields results that are, in general, substantially less biased than least-squares and Wiener filters. However, it is possible to 'debias' the least-squares results and obtain estimates that are as good as maximum likelihood under a restricted set of conditions. Publication: The Astrophysical Journal Supplement Series Pub Date: October 1990 DOI: 10.1086/191505 Bibcode: 1990ApJS...74..437S Keywords: Interstellar Magnetic Fields; Radio Astronomy; Zeeman Effect; Field Strength; Least Squares Method; Maximum Likelihood Estimates; Signal To Noise Ratios; Astrophysics; MAGNETIC FIELDS; RADIO SOURCES: GENERAL; ZEEMAN EFFECT full text sources ADS |
Publication Year: 1990
Publication Date: 1990-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 28
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