Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993

E. Pian, R. Edelson, S. Wagner, J. Bregman, I. George, A. Treves, W. Wamsteker, H. Bock, M. Carini, T. Courvoisier, M. Donahue, Y. Efimov, A. Filippenko, H. Fink, J. Heidt, A. Lawrence, L. Maraschi, H. R. Miller, G. Pike, A. QuirrenbachN. Shakhovskoy, A. Sillanpåå, M. Sitko, P. Smith, L. Takalo, H. Teråsranta, E. Valtaoja, M. Ward, R. Warwick

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The BL Lacertae object OJ 287 was intensively monitored with the IUE satellite from 1993 March 15 to 20 in the 2000-3000 Å wavelength region. The very low emission state of the source hampered the detection during part of the 23 performed exposures. The light curve at 2650 Å constructed with the 11 best images exhibits a variable trend with a factor ≲ 2 enhancement of the flux in about 3 hours. Simultaneous ground based observations show an optical flux variability of smaller amplitude, but correlated with the UV light curve without any apparent lag. The radio light curve is nearly constant. The UV emission state is the weakest observed in 15 years for this flaring blazar, being a factor of ≲ 20 lower than the maximum recorded one.

Original languageEnglish (US)
Pages (from-to)57-60
Number of pages4
JournalAdvances in Space Research
Issue number3
StatePublished - 1995

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • General Earth and Planetary Sciences


Dive into the research topics of 'Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993'. Together they form a unique fingerprint.

Cite this