Simultaneous EXOSAT-IUE observations of NGC 4151

NGC 4151 was observed four times in November 1983. 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); and (3...

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Bibliographic Details
Published in:	Space science reviews Vol. 40; no. 3-4; pp. 593 - 596
Main Authors:	Perola, G.C., Altamore, A., Boksenberg, A., Bromage, G.E., Clavel, J., Elvius, A., Penston, M.V., Pettini, M., Piro, L., Snijders, M.A.J., Tarenghi, M., Ulrich, M.H.
Format:	Journal Article
Language:	English
Published:	01-04-1985
Online Access:	Get full text
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Summary:	NGC 4151 was observed four times in November 1983. 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); and (3) the spectral fit to the ME data, after correction for a soft component, yields an alpha value of 1.73 + or - 0.27, N(H) = (15.2 + or -2.2) x 10 to the 22nd/sq cm, E.W. (Fe line) = 0.208 + or - 0.084 keV, and does not require a strong overabundance of Fe in the absorber. The relationship beween N(H) and the strength of the broad emission lines is commented upon.
Bibliography:	SourceType-Scholarly Journals-2 ObjectType-Feature-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Article-3
ISSN:	0038-6308 1572-9672
DOI:	10.1007/BF00179871