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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have performed near-infrared monitoring observations of Sgr A*, theGalactic center radio source associated with a supermassive black hole, withthe near-infrared camera CIAO and the 36-element adaptive optics system on theSubaru telescope. We observed three flares in the Ks band (2.15micron) during220 min monitoring on 2008 May 28, and confirmed the flare emission is highlypolarized, supporting the synchrotron radiation nature of the near-infraredemission. Clear variations in the degree and position angle of polarizationwere also detected: an increase of the degree of polarization of about 20 %,and a swing of the position angle of about 60 - 70 degrees in the decliningphase of the flares. The correlation between the flux and the degree ofpolarization can be well explained by the flare emission coming from hotspot(s)orbiting Sgr A*. Comparison with calculations in the literature gives aconstraint to the inclination angle i of the orbit of the hotspot around SgrA*, as 45 < i < 90 degrees (close to edge-on).

Near-infrared Polarimetry of flares from Sgr A* with Subaru/CIAO