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We develop the recipe to separate the spectral counterparts of the AGN NGC1275 from the emission of the Perseus cluster surrounding it in the spectraobserved by Suzaku/XIS cameras with no usage of the spectral fitting models.The Perseus cluster emission reaches higher energies than is typical for themost AGN-situated dense surroundings (i.e. up to 9-10 keV). That is why theseparation between the AGN and cluster spectra is especially important in thiscase. To avoid the degeneracy due to the huge quantity of the spectral fittingparameters such as abundances of elements the cluster consists of, thermal andCompton emission of the nucleus itself, and the jet SSC/IC emission spectralparameters as well we prefer to avoid the spectral fitting usage to performthis task. Instead, we use the spatial resolution of the components and doublebackground subtracting. For this purpose we choose the following regions tocollect all the photons from them: (1) circular or square-shaped region aroundthe source (AGN); (2) ring-shaped (or non-overlapped square) region surroundingthe AGN (for cluster); (3) remote empty circular region for the background.Having collected the photons from those regions we subtract the background(i.e. photons from the third region) from the source and cluster spectra. Next,we subtract the re-normalized cluster counts from the AGN spectrum; using therelation between the emission line amplitudes in the AGN and cluster spectra asthe renormalization coefficient. We have performed this procedure on the wholeset of the Suzaku/XIS observational data for NGC 1275 to obtain the cleanedspectra and light curve of the AGN emission in this system.

Separating the spectral counterparts in NGC 1275/Perseus cluster in X-rays