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X-ray Constraints on AGN Clustering

Published online by Cambridge University Press:  07 August 2017

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

Extract

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Studies of the HEAO–1 A2 all–sky survey data have established that the level of anisotropy of the extragalactic X–ray background (XRB) is relatively low:

  1. – The cell–to–cell XRB intensity variations can be entirely accounted for by Poisson fluctuations in the space distribution of known classes of sources; the 90% confidence upper limit to any additional contribution on a scale of 26 square degrees is 2.3% (Shafer and Fabian 1983).

  2. – No significant correlations of XRB intensity fluctuations appear to be present; the formal 90% confidence upper limit on the amplitude of autocorrelations, relative to the mean background intensity, for an angular scale of 3° is Γ(3°) ≤ 1.9 × 10−2 (Persic et al. 1988).

Type
Part 8: Relationships of Nucleus, Galaxy and Environment
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 492 - 493
Copyright
Copyright © Kluwer 1989 

References

Persic, M., De Zotti, G., Boldt, E.A., Marshall, F.E., Danese, L., Franceschini, A., and Palumbo, G.G.C. 1988, Ap. J. Lett., submitted.Google Scholar
Shafer, R.A., and Fabian, A.C. 1983, in IAU Symp. No. 104, p. 333.Google Scholar