On syntheses of the X-ray background with power-law sources | Zendy

G. de Zotti | Zendy; E. A. Boldt | Zendy; F. E. Marshall | Zendy; J. H. Swank | Zendy; A. E. Szymkowiak | Zendy; A. Cavaliere | Zendy; L. Danese | Zendy; A. Franceschini | Zendy

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On syntheses of the X-ray background with power-law sources

Author(s) -

G. de Zotti,

E. A. Boldt,

F. E. Marshall,

J. H. Swank,

A. E. Szymkowiak,

A. Cavaliere,

L. Danese,

A. Franceschini

Publication year - 1982

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 - 10.1086/159608

Subject(s) - physics , x ray background , astrophysics , astronomy , x ray astronomy , power law , law , x ray , nuclear physics , quasar , galaxy , statistics , mathematics , political science

We discuss if and under what conditions the combined emission from power-law sources can mimic the XRB spectrum in the range 3-50 keV measured with the A2 experiment on HEAO-1. We confirm that i good fit can be obtained, but the required spectral properties of component sources differ from those observed for local active galactic nuclei. Strong constraints are deduced for the low luminosity extension and for the evolution of such local objects. We show that any other class of sources significantly contributing to the X-ray background must be characterized by an energy spectral index y < 0.4, the mean index of the XRB (3-15 keV), and must exhibit steeper spectra at somewhat higher energies. Subject headings: galaxies: cluster of radiation mechanisms X-rays: sources X-rays: spectra

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