Simultaneous EXOSAT-IUE observations of NGC 4151 |
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| Authors: | G C Perola A Altamore A Boksenberg G E Bromage J Clavel A Elvius M V Penston M Pettini L Piro M A J Snijders M Tarenghi M H Ulrich |
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| Institution: | (1) Istituto Astronomico, Roma;(2) Royal Greenwich Observatory, UK;(3) Rutherford and Appleton Lab,s, UK;(4) Observatoire de Meudon, Germany;(5) Stockholm Observatory, Sweden;(6) ESO, Garching |
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| Abstract: | NGC 4151 was observed four times in Nov. 83. The results indicate that: a) there exists a correlation between the X-ray and UV fluxes on the long term; b) the soft X-ray excess between 0.1 and 1 keV is probably steeper than expected from the leaky absorber model by Holt et al (1980); c)the spectral fit to the ME data, after correction for a soft component, yields  =1,73±0.27, NH=(15.2±2.2)×1022 cm–2, E.W.(Fe line)=0.208±0.084 keV, and does not require a strong overabundance of Fe in the absorber. The relationship between NH and the strength of the broad emission lines is commented. |
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