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

Astronomy and Astrophysics – Astronomy

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Astronomical Models, Bl Lacertae Objects, Extragalactic Radio Sources, Radio Jets (Astronomy), Relativistic Electron Beams, Ultraviolet Astronomy, Astronomical Photometry, Compton Effect, Emission Spectra, Radiant Flux Density, Radio Spectra, Spectral Energy Distribution, Synchrotron Radiation

Scientific paper

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.

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