Multifrequency spectra of BL Lac objects

Details Multifrequency spectra of BL Lac objects Multifrequency spectra of BL Lac objects

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.293u&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 293-296 (SEE N89

Astronomy and Astrophysics

Astronomy

2

Bl Lacertae Objects, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, X Ray Sources, Electron Density (Concentration), Faint Objects, Field Strength, Plasma Jets, Relativistic Plasmas, Signal To Noise Ratios, Spectrum Analysis, Synchrotron Radiation

Scientific paper

A program to obtain simultaneous multifrequency spectra of BL Lacertae objects that are known X-ray sources is discussed. The IUE spectra are generally featureless and well-fitted by power law models. For the faintest exposures, Gaussian extraction of the spectrum can greatly impove the signal-to-noise. Most program objects vary in the ultraviolet, although the time scales are not known because of limited observing time. The broadband spectra of BL Lacs exhibit a range of characteristics but the curvature is always downward and the shape is generally smooth. This can be interpreted as synchrotron emission from a relativistic jet; different jet models are possible, and each allows a range of values for the bulk velocity, magnetic field strength, and electron density. Synchrotron models are not required, however an accretion disk model also gives a good fit to the ultraviolet-through-X-ray continuum.

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