Title: New results on the X-ray emission and its correlation with the ultraviolet in NGC 4151
Abstract:view Abstract Citations (154) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New Results on the X-Ray Emission and Its Correlation with the Ultraviole...view Abstract Citations (154) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New Results on the X-Ray Emission and Its Correlation with the Ultraviolet in NGC 4151 Perola, G. C. ; Piro, L. ; Altamore, A. ; Fiore, F. ; Boksenberg, A. ; Penston, M. V. ; Snijders, M. A. J. ; Bromage, G. E. ; Clavel, J. ; Elvius, A. ; Ulrich, M. H. Abstract Results from observations of the Seyfert galaxy NGC 4151 obtained with Exosat (0.1-25 keV) and IUE (1200-3000 A) during November 1983, and between December 1984 and January 1985, are presented. The stability of the flux during large-scale variations in the UV and X-ray regions suggests that the soft X-ray excess noted by Holt et al. (1980) represents a new spectral component whose temperature is estimated to be 1.8 million K, and luminosity to be 1.7 x 10 to the 42nd erg/s, if it is thermal emission from a hot gas. The observed variable UV and X-ray continua are well correlated down to a time scale of days, and the standard model of a power law with a uniform cold absorber gives a bad fit at low energies in the 1.2-25 keV range. The spectral index of the power law is found to correlate closely with the flux in the 2-10 keV range, with a shallower slope for lower intensity, and the iron fluorescence line at 6.4 keV is seen to respond very slowly to changes in the continuum. Publication: The Astrophysical Journal Pub Date: July 1986 DOI: 10.1086/164360 Bibcode: 1986ApJ...306..508P Keywords: Data Correlation; Galactic Radiation; Seyfert Galaxies; Ultraviolet Astronomy; X Ray Astronomy; Exosat Satellite; Iron; Iue; Light Curve; Spectrum Analysis; Temporal Distribution; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4151; GALAXIES: SEYFERT; GALAXIES: X-RAYS; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (3) NED (3) MAST (1) INES (1)Read More
Publication Year: 1986
Publication Date: 1986-07-01
Language: en
Type: article
Indexed In: ['crossref']
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Title: $New results on the X-ray emission and its correlation with the ultraviolet in NGC 4151
Abstract: view Abstract Citations (154) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New Results on the X-Ray Emission and Its Correlation with the Ultraviolet in NGC 4151 Perola, G. C. ; Piro, L. ; Altamore, A. ; Fiore, F. ; Boksenberg, A. ; Penston, M. V. ; Snijders, M. A. J. ; Bromage, G. E. ; Clavel, J. ; Elvius, A. ; Ulrich, M. H. Abstract Results from observations of the Seyfert galaxy NGC 4151 obtained with Exosat (0.1-25 keV) and IUE (1200-3000 A) during November 1983, and between December 1984 and January 1985, are presented. The stability of the flux during large-scale variations in the UV and X-ray regions suggests that the soft X-ray excess noted by Holt et al. (1980) represents a new spectral component whose temperature is estimated to be 1.8 million K, and luminosity to be 1.7 x 10 to the 42nd erg/s, if it is thermal emission from a hot gas. The observed variable UV and X-ray continua are well correlated down to a time scale of days, and the standard model of a power law with a uniform cold absorber gives a bad fit at low energies in the 1.2-25 keV range. The spectral index of the power law is found to correlate closely with the flux in the 2-10 keV range, with a shallower slope for lower intensity, and the iron fluorescence line at 6.4 keV is seen to respond very slowly to changes in the continuum. Publication: The Astrophysical Journal Pub Date: July 1986 DOI: 10.1086/164360 Bibcode: 1986ApJ...306..508P Keywords: Data Correlation; Galactic Radiation; Seyfert Galaxies; Ultraviolet Astronomy; X Ray Astronomy; Exosat Satellite; Iron; Iue; Light Curve; Spectrum Analysis; Temporal Distribution; Astrophysics; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4151; GALAXIES: SEYFERT; GALAXIES: X-RAYS; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (3) NED (3) MAST (1) INES (1)