Multifrequency observations of the BL Lacertae objects OQ 530 and ON 325

D. M. Worrall, J. J. Puschell, F. C. Bruhweiler, M. L. Sitko, W. A. Stein, M. F. Aller, H. D. Aller, P. E. Hodge, R. J. Rudy, H. R. Miller, W. Z. Wisniewski, F. A. Cordova, K. O. Mason

Research output: Contribution to journalArticle (Academic Journal)peer-review


Spectral measurements of the two BL Lac objects OQ 530 and ON 325 are presented. The measurements were taken at frequencies ranging from radio to ultraviolet. Both sources show spectral curvature between the infrared and ultraviolet frequencies. The intensity and spectral shape of OQ 530 vary, but the spectral shape of ON 325 appears to remain constant during intensity variability. A nonthermal theoretical model of jet emission is developed which incorporates both the spectral and time variability data. The model predicts that ON 325 radiates at X-ray frequencies with Compton radiation dominating over synchrotron emission. The angular size of the jet emission is predicted to be less than 0.1 milli-arcsec at high radio frequencies.
Original languageEnglish
Pages (from-to)512-518
JournalAstrophysical Journal
Publication statusPublished - 1 Sep 1984


  • Astronomical Spectroscopy
  • Bl Lacertae Objects
  • Radiation Sources
  • Compton Effect
  • Infrared Spectra
  • Iue
  • Radio Spectra
  • Synchrotron Radiation
  • X Ray Spectra

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