Observations of three BL Lacertae objects - Constraints on inhomogeneous relativistically beamed jet models

Worrall, D. M.; Rodriguez-Espinosa, J. M.; Wisniewski, W. Z.; Miller, H. R.; Bruhweiler, F. C.; Aller, M. F.; Aller, H. D.
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Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 589-595. Research supported by the Georgia State University.

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Multifrequency observations are presented of three BL Lac objects, including the first UV measurements of 0912 + 297 and 1219 + 285. An eight day optical flare was measured from 0422 = 004 in which a doubling in visual flux density was noted; other sources displayed smaller daily fluctuations. The 5-15 GHz radio flux from these three objects remained constant for two months, although the 15-20 GHz emission from 0912 + 297 varied slightly over a period of a month. Constraints which are provided by these and other Bl Lac data are discussed for inhomogeneous relativistically beamed jet models. It is concluded that a tapered jet model is in good agreement with the data for each source and that additional emission regions are not required.