Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..904s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 3, p. 904-909
Astronomy and Astrophysics
Astronomy
16
Active Galactic Nuclei, Astronomical Photometry, Astronomical Spectroscopy, Blazars, Bursts, Light (Visible Radiation), Light Curve, Luminous Intensity, Ultraviolet Radiation, Variations, Astronomical Observatories, Charge Coupled Devices, High Dispersion Spectrographs, Iue, Spectrophotometers, Telescopes
Scientific paper
An ongoing program of photometric monitoring of selected active galactic nuclei has revealed a significant outburst in the optically violently variable (OVV) quasi-steller object (QSO) 3C 279. The event occurred during May and June of 1992, and was characterized by a peak amplitude of 2.3 mag in the R band. We obtained nearly simultaneous optical and ultraviolet spectroscopy from 1150 to 8600 A of the source at the approximate midpoint of the outburst. The outburst spectrum is well represented by a power law with index alpha = -1.77 (where Fnu varies as nu alpha which is relatively flat in comparison with typical quiescent spectra for this source. No emission features are discernable in our data, nor is there any significant Lyman-edge absorption. The observations and data analysis procedures are described, and the resulting photometric light curves and spectra are presented. We also present a long baseline photometric light curve for context. Comparisons with previously published optical-UV outburst and quiescent spectra are made, and luminosity-dependent spectral variations are discussed.
Balonek Thomas J.
Brotherton Michael S.
Godlin S. D.
McCollum Bruce
Shrader Chris R.
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