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We present a sample of 99 dwarf galaxies ($M_*<10^{9.5} M_\odot$) with X-rayactivity in their central regions. The sample was obtained from a match of theSRG/eROSITA X-ray catalogue in the Eastern Galactic hemisphere with the MPA-JHUSDSS catalogue. The obtained matches were cleaned rigorously with the help ofexternal optical catalogues to increase the purity of the sample. This work isthe largest study of this kind -- X-ray activity in $\approx 85$ per cent ofmatched dwarfs was not reported before. The majority of X-ray active dwarfs areidentified as star-forming galaxies. However, the X-ray luminosity of 82objects cannot be explained by the collective emission of X-ray binaries,rendering them strong candidates for dwarf galaxies with an active accretingblack hole in their centre. We find that the fraction of AGN among dwarfgalaxies drops from $\sim 2\cdot 10^{-2}$ at $L_X\sim 10^{39}$ erg/s to $\sim(2-4)\cdot 10^{-4}$ at $L_X\sim 10^{41}$ erg/s and increases with the stellarmass of the host galaxy. We serendipitously discovered sources with unexpectedproperties. We report on a tidal disruption event (TDE) candidate in a dwarfgalaxy, a massive black hole in a dwarf galaxy with a soft thermal spectrum, aluminous dwarf galaxy with an obscured X-ray spectrum and a few other peculiarsources. We found three Ultra-luminous X-ray source (ULX) candidates and asample of X-ray bright galaxy pairs, in four of which both members shine inX-rays.

SRG/eROSITA catalogue of X-ray active SDSS dwarf galaxies