Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l..13h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Oct. 1, 1980, p. L13-L17.
Astronomy and Astrophysics
Astrophysics
147
Interstellar Matter, Quasars, Seyfert Galaxies, X Ray Sources, X Ray Spectra, Absorption Spectra, Cold Gas, Heao
Scientific paper
X-ray spectral data from NGC 4151 taken with the Einstein Solid-State Spectrometer (SSS) and the HEAO 1 A-2 experiment cannot be simply reconciled with absorption from a uniform column of cold gas. The SSS data can, however, be explained in terms of a clumped absorber with approximately 10% uncovered fraction and factor-of-two overabundances in Z equal to or greater than 14 elements relative to solar oxygen. It is shown that these and previously reported spectral and variability data can be quantitatively reconciled with absorption arising in the cold clouds responsible for the broad optical line emission if the cloud dimensions are small compared to the central source size. It is suggested that the lack of significant X-ray absorption observed from much higher luminosity Seyferts and quasars is a natural consequence of the proposed picture for NGC 4151.
Becker Robert H.
Boldt Elihu A.
Holt Stephen S.
Mushotzky Richard F.
Serlemitsos Peter J.
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