Quasi-simultaneous observations of BL Lac object MRK 501 in X-ray, UV, visible, IR, and radio frequencies

Details Quasi-simultaneous observations of BL Lac object MRK 501 in X-ray, UV, visible, IR, and radio frequencies Quasi-simultaneous observations of BL Lac object MRK 501 in X-ray, UV, visible, IR, and radio frequencies

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..690k&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 690-699. Research supported by the Western Kentucky University and NS

Astronomy and Astrophysics

Astronomy

33

Bl Lacertae Objects, Infrared Astronomy, Radio Spectra, Ultraviolet Astronomy, Visible Spectrum, X Ray Sources, Heao 1, Spectral Energy Distribution, Synchrotron Radiation, Ultraviolet Spectra, X Ray Spectra

Scientific paper

Observations in the X-ray, UV, visible, IR and radio regions of the BL Lac object Mrk 501 made over the course of two months are reported. The measurements were made with the A2 experiment on HEAO 1 (X-ray), the SWP and LWR cameras on IUE (UV), the 5-m Hale telescope (visible), the 2.5-m telescope at Mount Wilson (IR), the NRAO 92-m radio telescope at Green Bank (4750 MHz) and the 46-m radio telescope at the Algonquin Observatory (10275 and 10650 MHz). The quasi-simultaneously observed spectral slope is found to be positive and continuous from the X-ray to the UV, but to gradually flatten and possibly turn down from the mid-UV to the visible; the optical-radio emission cannot be accounted for by a single power law. The total spectrum is shown to be compatible with a synchrotron self-Compton emission mechanism, while the spectrum from the visible to the X-ray is consistent with synchrotron radiation or inverse-Compton scattering by a hot thermal electron cloud. The continuity of the spectrum from the UV to the X-ray is noted to imply a total luminosity greater than previous estimates by a factor of 3-4.

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