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

The recent VLBI observation of the Galactic center black hole candidate SgrA* at 1.3mm shows source structure on event-horizon scales. This detectionenables a direct comparison of the emission region with models of the accretionflow onto the black hole. We present the first results from time-dependentradiative transfer of general relativistic MHD simulation data, and comparesimulated synchrotron images at black hole spin a=0.9 with the VLBImeasurements. After tuning the accretion rate to match the millimeter flux, wefind excellent agreement between predicted and observed visibilities, even whenviewed face-on (i < 30 degrees). VLBI measurements on 2000-3000km baselinesshould constrain the inclination. The data constrain the accretion rate to be(1.0-2.3)x10^-9 M_sun / yr with 99% confidence, consistent with but independentof prior estimates derived from spectroscopic and polarimetric measurements.Finally, we compute light curves, which show that magnetic turbulence candirectly produce flaring events with .5 hour rise times, 2-3.5 hour durationsand 40-50% flux modulation, in agreement with observations of Sgr A* atmillimeter wavelengths.

Millimeter Flares and VLBI Visibilities from Relativistic Simulations of Magnetized Accretion onto the Galactic Center Black Hole