Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..415m&link_type=abstract
Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 415-436. Research supported by the Research Corp., Georgia State Un
Astronomy and Astrophysics
Astronomy
71
Astronomical Photometry, Black Holes (Astronomy), Elliptical Galaxies, Galactic Radiation, Noise Spectra, Polarimetry, Polarization Characteristics, Brightness, Electromagnetic Noise, Random Walk, Spectrum Analysis, Tables (Data), White Noise
Scientific paper
Results are presented from an intensive optical and IR monitoring program of the flux and polarization characteristics of BL Lac. It is found that the polarization variations increase in amplitude with increasing time interval, and that the path traced out by the polarization vector in the Q-U plane is a random walk. In view of earlier measurements of BL Lac, the polarization fluctuations can be represented at low frequencies by the flat power spectrum of white noise, up to a frequency of 0.05 cycles/day. Above this frequency, the spectrum steepens to that of a random walk. A model for BL Lac suggested by the polarimetric noise can be constructed from independent sources of light with randomly oriented, strong polarization. Small random differences in spectral index from source to source could also explain the variable wavelength dependence of polarization.
Angel James Roger P.
Axon David J.
Bailey Jeremy
Duerr R.
Hough J. M.
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