Spectral-luminosity evolution of active galactic nuclei and the cosmic X- and gamma ray background

Details Spectral-luminosity evolution of active galactic nuclei and the cosmic X- and gamma ray background Spectral-luminosity evolution of active galactic nuclei and the cosmic X- and gamma ray background

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..359l&link_type=abstract

In its The Compton Observatory Science Workshop p 359-366 (SEE N92-21874 12-90)

Astronomy and Astrophysics

Astronomy

2

Accretion Disks, Active Galactic Nuclei, Background Radiation, Black Holes (Astronomy), Electromagnetic Acceleration, Galactic Evolution, Seyfert Galaxies, Charged Particles, Particle Acceleration, Red Shift, Stellar Mass, X Rays

Scientific paper

Coherent electromagnetic dynamo acceleration processes, which act on charge particles within the context of black hole accretion disk scenarios, are generally regarded as the underlying central power source for active galactic nuclei (AGN). If the precursor active galaxies (PAG) for such AGN are formed at high redshift and contain initial seed black holes with mass approximately equal to 104 solar masses, then the Eddington limited X-ray radiation emitted during their lifetime will undergo the phenomenon of 'spectral-luminosity evolution'. When accretion disks are first formed at the onset of galaxy formation the accretion rate occurs at very high values of luminosity/size compactness parameter L/R greater than 1030 erg/cm-sec. In the absence of extended structure, such high values of L/R generate dynamic constraints which suppress coherent, black hole/accretion disk dynamo particle acceleration processes. This inhibits nonthermal radiation processes and causes the spectrum of X-radiation emitted by PAG to be predominantly thermal. A superposition of PAG sources at z is greater than or equal to 6 can account for the residual cosmic X-ray background (CXB) obtained from the total CXB after subtraction of foreground AGN sources associated with present epoch Seyfert galaxies. The manner in which the PAG undergo spectral-luminosity evolution into Seyfert galaxies is investigated.

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