Other
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..619w&link_type=abstract
The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 619-622
Other
Gamma Ray Spectra, Quasars, Spectral Emission, Spectral Energy Distribution, X Ray Sources, Astronomical Models, Compton Effect, Ultraviolet Spectra
Scientific paper
The high-energy spectrum of the quasar 3C 273 and its variations are compared to the predictions of different emission models. High-compactness models are not able to reproduce the observations even when the energy density of the soft photons is relatively small in the X-ray source. The observed spectral variations are, however, explained in a natural way by inverse Compton processes occurring in a source of low compactness (this includes low-compactness, photon-starved pair models). The energy of the bulk of the Comptonizing electrons can be derived independently from the spectral variations and from the gamma-ray spectral shape. Both evaluations coincide with epsilon approximately m(e) c2. The low-compactness parameter derived from these observations contrasts with the high-compactness derived from the fast X-ray variability timescale. Beaming effects can formally account for the discrepancy. However, it is difficult to use such models to explain other observational constraints. A pancake-shaped, unbeamed X-ray source is an other possible solution.
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