The Compton Mirror in NGC 4151 | Zendy

Juri Poutanen | Zendy; M. Sikora | Zendy; Mitchell C. Begelman | Zendy; P. Magdziarz | Zendy

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The Compton Mirror in NGC 4151

Author(s) -

Juri Poutanen,

M. Sikora,

Mitchell C. Begelman,

P. Magdziarz

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310149

Subject(s) - physics , astrophysics , accretion disc , galaxy , line of sight , compton scattering , accretion (finance) , emission spectrum , line (geometry) , astronomy , recoil , spectral line , active galactic nucleus , corona (planetary geology) , scattering , optics , geometry , nuclear physics , mathematics , astrobiology , venus

We show that the sharp cutoff in the hard X-ray spectrum of NGC 4151, unusualfor Seyfert 1 galaxies, can be reconciled with the average Seyfert 1 spectrumif we assume that the central source is completely hidden from our line ofsight by the thick part of the accretion disk or by the broad emission lineclouds. The observed X-ray radiation is produced by scattering of the Seyfert1-type spectrum in the higher, cooler parts of the accretion disk corona, or ina wind. A sharp cutoff appears as a result of the Compton recoil effect. Thismodel naturally explains a discrepancy regarding the inclination of the centralsource, inferred to be low (face-on) from observations of the iron $K\alpha$emission line, but inferred to be high on the basis of optical and UVobservations.Comment: 10 pages; AASTEX 4.0; 1 postscript figure; juri@astro.su.se; to appear in Astrophysical Journal Letters, July 10, 199

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