NGC 4151 was observed four times in Nov. 83. The results indicate that: (1) there exists a correlation between the X-ray and UV fluxes on the long term; (2) 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); (3) the spectral fit to the ME data, after correction for a soft component, yields α = 1.73±0.27, NH = (15.2±2.2)×1022cm-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.
Perola G., C., Altamore, A., Boksenberg, A., Bromage G., E., Clavel, J. (1985). Simultaneous Exosat-IUE observations of NGC 4151. In ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984 [10.1007/BF00179871].
Simultaneous Exosat-IUE observations of NGC 4151
ALTAMORE, Aldo;
1985-01-01
Abstract
NGC 4151 was observed four times in Nov. 83. The results indicate that: (1) there exists a correlation between the X-ray and UV fluxes on the long term; (2) 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); (3) the spectral fit to the ME data, after correction for a soft component, yields α = 1.73±0.27, NH = (15.2±2.2)×1022cm-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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
