2001/10/22 by W. Sliwa, W. Śliwa, A. M. Soltan +2 · 1 citation
Physics and Astronomy · #Anisotropy #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Flux (metallurgy) #Galaxies: Formation, Evolution, Phenomena #Harmonic #Harmonics #ROSAT #Scale (ratio) #Spectral density #Spectral line #Spectrum (functional analysis) #astro-ph
paper · pdf · doi:10.1051/0004-6361:20011463
12 pages, A&A accepted
arxiv created 2001/10/22 · openalex publication_date 2001/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Fluctuations of the soft X-ray background are investigated using harmonic analysis. A section of the ROSAT All-Sky Survey around the north galactic pole is used. The flux distribution is expanded into a set of harmonic functions and the power spectrum is determined. Several subsamples of the RASS have been used and the spectra for different regions and energies are presented. The effects of the data binning in pixels are assessed and taken into account. The spectra of the analyzed samples reflect both small scale effects generated by strong discrete sources and the large scale gradients of the XRB distribution. Our results show that the power spectrum technique can be effectively used to investigate anisotropy of the XRB at various scales. This statistics will become a useful tool in the investigation of various XRB components.