Abstract
One of the brightest X-ray Seyfert galaxies, Mkn 509, has been observed with the X-ray satellite EXOSAT. Wide-band ((0.05÷35) keV) spectral information is now available at the same time. Different filters have been rotated in front of the low-energy telescope. The overall spectrum is best fitted by a two-component power law. The intensity and the spectral index of the soft component are in agreement with the extrapotation of the UV spectrum; the high-energy component exhibits a spectral index harder than reported by previous observations and a correspondingly lower intensity. Therefore, at least for this source, the predicted low-energy spectral turnover is a smooth prolungation of the UV spectrum rather than a sharp discontinuity.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
