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Titolo:
X-RAY PHOTOIONIZED ACCRETION DISKS - UV AND X-RAY CONTINUUM SPECTRA AND POLARIZATION
Autore:
MATT G; FABIAN AC; ROSS RR;
Indirizzi:
UNIV CAMBRIDGE,INST ASTRON,MADINGLEY RD CAMBRIDGE CB3 0HA ENGLAND COLL HOLY CROSS,DEPT PHYS WORCESTER MA 01610
Titolo Testata:
Monthly Notices of the Royal Astronomical Society
fascicolo: 4, volume: 264, anno: 1993,
pagine: 839 - 852
SICI:
0035-8711(1993)264:4<839:XPAD-U>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACTIVE GALACTIC NUCLEI; COLD MATTER; SEYFERT-1 GALAXIES; LINE-PROFILES; BLACK-HOLE; IRON LINE; DISKS; VARIABILITY; QUASARS; MODELS;
Keywords:
ACCRETION, ACCRETION DISKS; POLARIZATION; RADIATIVE TRANSFER; GALAXIES, ACTIVE; X-RAYS, GALAXIES; X-RAYS, STARS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
59
Recensione:
Indirizzi per estratti:
Citazione:
G. Matt et al., "X-RAY PHOTOIONIZED ACCRETION DISKS - UV AND X-RAY CONTINUUM SPECTRA AND POLARIZATION", Monthly Notices of the Royal Astronomical Society, 264(4), 1993, pp. 839-852

Abstract

We calculate the UV and X-ray continuum spectrum and polarization from an accretion disc centrally illuminated by X-rays. The calculation of the ionization structure of the disc is performed by using the numerical code described by Ross & Fabian, while the inclination effects and the polarization are calculated by solving the transfer equation forpolarized radiation. The general relativistic effects in the Schwarzschild metric are also taken into account. The spectra we obtain can explain the X-ray observation for some active galactic nuclei and several Galactic black hole candidates, for which both the iron-line intensity and the shape of the reflection continuum appear to be inconsistentwith reprocessing from neutral matter. We find that the degree and angle of polarization vary strongly with the energy; this fact should betestable by future observations. We also suggest, on the basis of earlier works by Loskutov & Sobolev, that the absorption opacity solutionof the polarization problem for thin discs can reconcile theory with observations, since even a small absorption opacity can strongly reduce the polarization degree to very low, if observable, values.

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Documento generato il 05/07/20 alle ore 10:06:09