Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..589w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 15, 1986, p. 589-595. Research supported by the Georgia State Un
Astronomy and Astrophysics
Astronomy
29
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.
Aller Hugh D.
Aller Margo F.
Bruhweiler Fred C.
Miller Richard H.
Rodriguez-Espinosa José M.
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