Example of new X-ray spectrum of Seyfert galaxy in SDSS filament: 2MASX J15585579+0248338. Details see in [5]. 

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... New sample of X-ray galaxies selected from 2XMMi catalogue in SDSS region is analysed in this work. Spatial distribution and X-ray AGN spectral prop- erties are discussed. A new method for extragalactic filament detection and description is proposed. Keywords: X-rays: galaxies; large-scale structure of Universe Xgal - a sample of 5021 X-ray emitting galaxies was compiled in [3] based on 2XMM catalog ([6]) and HyperLeda database. In [2] it was shown that extragalactic X-ray sources are AGNs and clusters. It was also shown in [4] that the main type of X-ray galaxies is Seyfert 1. X-ray spectra of 42 Seyfert 1 galaxies from SDSS region were analysed in [5]. These galaxies has radial velocities from 4000 to 39000 km/s (appropriate for filament detection) and does not necessary belongs to known filaments from [1]. An example of 100 Mpc-thick slice with Xgal objects and filaments is presented at Fig. 2. For 7 galaxies X-ray spectra were obtained in [5] at first time. One of them is presented at Fig. 3. Xgal sample was inspected to check entries of identification of more than one optical galaxy with the same X-ray source. 344 such entries were found in the whole sample. Twelve X-ray sources corresponds to 3 optical galaxies, three to 4, two to 5 and one to 6. The cases of multiple identifications in 4000-39000 km/s range includes 12 X-ray galaxy clusters, 3 groups and 8 pairs. 392 extragalactic X-ray sources were found in Xgal sample in the same redshift range but outside SDSS sky region. These are 138 galaxy clusters, 36 groups, 3 pairs, 175 AGNs, 1 emission line galaxy, 5 irregular galaxies and 34 indefinite galaxies. AGNs includes 86 Seyfert 1 galaxies, 49 Seyfert 2 galaxies, 8 quasars, 13 blasars, 7 ...