Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276..454b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 15, 1984, p. 454-465. NASA-supported research.
Astronomy and Astrophysics
Astronomy
54
Bl Lacertae Objects, Infrared Astronomy, Radio Sources (Astronomy), X Ray Sources, Compton Effect, Electron Density (Concentration), Iue, Magnetic Fields, Ultraviolet Radiation, Very Long Base Interferometry
Scientific paper
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.
Aller Hugh D.
Aller Margo F.
Balonek Thomas J.
Bregman Joel N.
Dent William A.
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