Multifrequency observations of the BL Lacertae object 0735 +178.
Rieke, G. H.; Pollock, J. T.; Huggins, P. J.; Bregman, J. N.; Glassgold, A. E.; Aller, H. D.; Aller, M. F.; Hodge, P. E.; Lebofsky, M. J.; Pica, A. J.; Leacock, R. J.; Smith, A. G.; Webb, J.; Balonek, T. J.; Dent, W. A.; O'Dea, C. P.; Ku, W. H. -M.; Schwartz, D. A.; Miller, J. S.; Rudy, R. J.; Levan, P. D.
United States
Abstract
Four simultaneous spectra covering the radio through the X-ray regimes were made between 1979 October and 1981 March of the variable BL Lac object 0735+178. In each spectrum, the IR-UV synchrotron continuum dominates the total observed power (1047 ergs s-1) and presumably becomes opaque between 1011 and 1013 Hz. Extensive nonsimultaneous observations were made over a longer period of time in order to study long- and short-term variability at X-ray, optical, and radio frequencies. These data show that the rapid and dramatic variations evident at infrared and optical wavelengths are absent at radio and X-ray frequencies. These observations support a picture where the IR-UV flux emanates from a small region, while the X-rays are produced by the inverse Compton process in the radio-emitting region. A quantitative model for this picture is presented.