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

In 2019, Sgr A* - the supermassive black hole in the Galactic Center -underwent unprecedented flaring activity in the near infrared (NIR),brightening by up to a factor of 100 compared to quiescent values. Here wereport ALMA observations of Sgr A*'s continuum variability at 1.3 mm (230 GHz)- a tracer of the accretion rate - conducted one month after the brightestdetected NIR flare and in the middle of the flaring activity of 2019. Wedevelop an innovative light curve extraction technique which (together withALMA's excellent sensitivity) allows us to obtain the light curves which aresimultaneously of high time resolution (2 seconds) and high signal-to-noiseratio (~ 500). We construct an accurate intrinsic structure function of the SgrA* submm variability, improving on previous studies by about two orders ofmagnitude in timescale and one order of magnitude in sensitivity. We comparethe June 2019 variability behavior with that of 2001-2017, and suggest that themost likely cause of the bright NIR flares is magnetic reconnection.

Second Scale Submillimeter Variability of Sagittarius A* during flaring activity of 2019: On the Origin of Bright Near Infrared Flares