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        Determining the reality of x-ray filaments

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        901357.pdf (PDF, 546Kb)
        Author
        Hardcastle, M.J.
        Attention
        2299/1191
        Abstract
        A number of authors have reported filaments connecting bright structures in high-resolution X-ray images, and in some cases these have been taken as evidence for a physical connection between the structures, which might be thought to provide support for a model with non-cosmological redshifts. In this paper I point out two problems which are inherent in the interpretation of smoothed photon-limited data of this kind, and develop some simple techniques for the assessment of the reality of X-ray filaments, which can be applied to either simply smoothed or adaptively smoothed data. To illustrate the usefulness of these techniques, I apply them to archival ROSAT observations of galaxies and quasars previously analysed by others. I show that several reported filamentary structures connecting X-ray sources are not in fact significantly detected.
        Publication date
        2000
        Published in
        Astronomy and Astrophysics
        Other links
        http://hdl.handle.net/2299/1191
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