UV observations of the BL Lac object 0716+71.

Abstract

UV observations acquired by the IUE satellite of the BL Lac object 0716+71 are presented. Data were obtained in both the long- and short-wavelength ranges (2400-3000 and 1250-1900 A) and reduced using the spatially resolved line by line spectrum and the geometrically and photometrically corrected image in view of the very low signal-to-noise ratio. Integrated fluxes of 6.4 + or - 0.5 and 2.9 + or - 0.4 x 10 to the -13th erg/sec per sq cm are measured for the 1300-1900 and 2400-3000A ranges, respectively, using the corrected image, and 8.6 + or - 0.8 and 3.7 + or - 0.5 x 10 to the -13th erg/sec per sq cm using the line by line spectrum. Data are consistent with an overall power law spectrum with an index of -1 from the mm to the X-ray region and a pronounced excess in the near IR and optical regions.