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tokens: ACKNOWLEDGEMENTS This work was supported by the Russian Foundation of Basic Research (grant 17-52-80139 BRICS-a). SST acknowledges the support of the Academy of Finland grants 309228, 316932 and 317552. VD thanks the Deutsches Zentrum for Luft- und Raumfahrt (DLR) and Deutsche Forschungsgemeinschaft (DFG) for the support. Authors thank to Prof. Frederick Walter for comments and suggestions that allowed to improve the manuscript. The research has made use of Chandra data and software provided by the Chandra X-ray Centre. We used also data supplied by the UK Swift Science Data Centre at the University of Leicester. Results are also based on data products from VVV Survey observations made with the VISTA telescope at the ESO Paranal Observatory.