Ultraviolet and X-ray observations of the BL Lac object MK 501

Details Ultraviolet and X-ray observations of the BL Lac object MK 501 Ultraviolet and X-ray observations of the BL Lac object MK 501

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.189..873s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 189, Dec. 1979, p. 873-881. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

17

Bl Lacertae Objects, Satellite Observation, Spaceborne Astronomy, Ultraviolet Radiation, X Ray Sources, Bremsstrahlung, Elliptical Galaxies, Infrared Radiation, Radiant Flux Density, Synchrotron Radiation

Scientific paper

We present ultraviolet and X-ray satellite observations of Mk 501. The ultraviolet data after dereddening assuming E(B-V) = 0.11 show a power-law spectrum with α = 0.51+0.10-0.15. The visible and infrared fluxes are in good agreement with this power-law if the underlying elliptical galaxy has a luminosity MV = -22.4. Extrapolation of the ultraviolet power-law gives a good fit to the radio data for υ > 10GHz. Although the observations at different frequencies were not simultaneous, time variations large enough to affect our conclusions seem unlikely. The X-ray measurements show a powerlaw with α = 0.8±0.5 or bremsstrahlung with kT& gt; 6 keV, and we exclude self-Compton radiation from the low frequency (υ < 10GHz) radio component as the dominant mechanism for X-ray production. A possible alternative is self-Compton radiation from the 10 GHz to ultraviolet synchrotron source.

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