Far UV observations of PKS2155-304

Details Far UV observations of PKS2155-304 Far UV observations of PKS2155-304

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..555m&link_type=abstract

Nature, vol. 285, June 19, 1980, p. 555-557.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Bl Lacertae Objects, Far Ultraviolet Radiation, Ultraviolet Astronomy, Absorption Spectra, Radiant Flux Density, Spectrum Analysis

Scientific paper

Far UV observations of the BL Lac object PKS 2155-304 are presented. Spectra were taken in the range 1150-3200 A by the long- and short-wavelength cameras on board the IUE when the object was in a bright phase. No strong emission lines are observed, and, except for the region 2000-2200 A, the spectrum exhibits a good fit to a power law of spectral index -1. The UV observations are found to connect smoothly with optical and IR observations of the object in its brightest state, and to extrapolate to the X-ray flux, implying a two-component spectrum with a change in spectral slope around 10 to the 15th Hz. Implications of the spectral break, which has also been observed in the only other BL Lac objects to be studied in the UV, MK 421 and MK 501, for possible emission mechanisms are discussed.

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