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Properties of the Surface Brightness Distribution of the Cosmic X–Ray Background

Published online by Cambridge University Press:  08 February 2017

G. De Zotti ,
A. Franceschini ,
M. Persic ,
L. Danese ,
E. A. Boldt ,
F. E. Marshall  and
G. G. C. Palumbo
G. De Zotti
Affiliation:
1Osservatorio Astronomico and Dipartimento di Astronomia, Padova, Italy
A. Franceschini
Affiliation:
1Osservatorio Astronomico and Dipartimento di Astronomia, Padova, Italy
M. Persic
Affiliation:
2Laboratory for High Energy Astrophysics, NASA/GSFC, Greenbelt, Maryland, USA
L. Danese
Affiliation:
1Osservatorio Astronomico and Dipartimento di Astronomia, Padova, Italy
E. A. Boldt
Affiliation:
2Laboratory for High Energy Astrophysics, NASA/GSFC, Greenbelt, Maryland, USA
F. E. Marshall
Affiliation:
2Laboratory for High Energy Astrophysics, NASA/GSFC, Greenbelt, Maryland, USA
G. G. C. Palumbo
Affiliation:
3Dipartimento di Astronomia, Bologna, Italy

Extract

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The HEAO–1 A2 scanning survey has provided small field-of-view data characterized by a full width zero intensity of 3° along the scan direction (at approximately constant ecliptic longitude λ) and of 6° perpendicular to it. We have used independent fields taken from scanning circles separated by Δλ = 6° and whose centers are separated by Δβ = 3°. After having excluded all fields at | β | < 60° or at | b | ≤ 20°, only 905 of the total turned out to be not significantly contaminated by diffuse galactic emission or by known discrete sources. The flux intensity at each field's central position was evaluated by fitting a point source plus a constant background. The sample average C (θ) of the products dI (θ) x dI'(θ + Δθ) of positive and negative intensity fluctuations computed for angular separations of 3°, 6°, …, and 27° provides the X-ray background (XRB) angular correlation function.

Type
IV. Extragalactic Background Radiation and Cosmology
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 410 - 411
Copyright
Copyright © Kluwer 1990 

References

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