The HISS of BL Lacertae

Details The HISS of BL Lacertae The HISS of BL Lacertae

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..176m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 176-186.

Astronomy and Astrophysics

Astrophysics

27

Bl Lacertae Objects, Hiss, Polarimetry, Astronomical Photometry, Error Analysis, Power Spectra

Scientific paper

The polarimetric variability of BL Lacertae is characterized by a random-walk noise spectrum on time scales of hours to weeks. The authors present here approximately 12 hr of polarimetric data obtained on three nights in 1983 - 1984 with the Hale 5 m telescope, which push our knowledge of the variability to the shortest time scales currently possible. During each of the runs, BL Lac was consistently variable. Power spectra of the variations in degree and position angle of polarization roughly follow power laws of index α ≈ 3±1 between time scales of 15 minutes to 3 hours. In the context of the "Christmas tree" model of variations, the steep spectrum at high frequencies suggests a lower limit near 1 light-hr for the size of individual components.

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