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

We report on the nature of prominent sources of light and shadow in theGalactic Center. With respect to the Bremsstrahlung X-ray emission of the hotplasma in that region the Galactic Center casts a 'shadow'. The 'shadow' iscaused by the Circum Nuclear Disk that surrounds SgrA* at a distance of about 1to 2 parsec. This detection allows us to do a detailed investigation of thephysical properties of the surroundings of the super massive black hole.Further in, the cluster of high velocity stars orbiting the central supermassive black hole SgrA* represents an ideal probe for the gravitationalpotential and the degree of relativity that one can attribute to this area.Recently, three of the closest stars (S2, S38, and S55/S0-102) have been usedto conduct these investigations. In addition to the black hole mass anddistance a relativistic parameter defined as ${\Upsilon}=r_s/r_p$ could bederived for star S2. The quantity $r_s$ is the Schwarzschild radius and $r_p$is the pericenter distance of the orbiting star. Here, in this publication, wehighlight the robustness and significance of this result. If one aims atinvestigating stronger relativistic effects one needs to get closer to SgrA*.Here, one can use the emission of plasma blobs that orbit SgrA*. Thisinformation can be obtained by modeling lightcurves of bright X-ray flares.Finally, we comment on the shadow of the SgrA* black hole expected due to lightbending and boosting in its vicinity.

Light and shadow in the Galactic Center - On the detection of the relativistic periastron shift of star S2 in the Galactic Center