English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Based on a comparison of the SRG/eROSITA catalog of X-ray active stars andthe Gaia catalog, a sample of 502 peculiar objects was obtained for which Gaia,on one hand, detects statistically significant values of parallax or propermotion and, on the other hand, registers signs of the non zero source extent inthe optical band. In the log ($F_X/F_{\rm opt}$) - (G-RP) color diagram theseobjects are separated from the balk of X-ray active stars and are located inthe region typical for the galaxies with active nuclei. According to the SIMBADdatabase, about $\sim 50$% of them are confirmed AGNs and galaxies withspectroscopically measured redshifts, and only $\sim$1.4% are confirmedGalactic objects. Spectroscopic observations of 19 unidentified objects on theRTT-150 telescope demonstrated, that 18 of them are AGNs at redshifts$\sim$0.01-0.3, and one object is a M star in our Galaxy. We discuss variousscenarios explaining the nature of such peculiar objects.

Detection of AGNs and quasars having significant proper motions according to Gaia data within SRG/eRosita X-Ray sources catalog