SIMBAD references

2020ApJ...892L..30I - Astrophys. J., 892, L30-L30 (2020/April-1)

Time variations in the flux density of Sgr A* at 230 GHz detected with ALMA.


Abstract (from CDS):

A radio source at the Galactic center Sgr A* is a prime supermassive black hole candidate and therefore key to developing our understanding of them. Time variations in the 230 GHz band flux of Sgr A* have been found with the Atacama Large Millimeter/submillimeter Array Cycle 5 observations. Measuring the flux density of Sgr A* in 1 minute snapshots at 217.5, 219.5, and 234.0 GHz, we obtained light curves for ten 70 minute periods. The light curves show variations at a few tens of minutes and hourly scales. The shorter timescale is similar to the orbital period of the innermost stable circular orbit around a 4 x 106 M black hole, suggesting that the variation originates from the immediate vicinity of Sgr A*. We also detected no time lag between 217.5 and 234.0 GHz and a dependence of the spectral index on the flux density.

Abstract Copyright: © 2020. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Supermassive black holes - Low-luminosity active galactic nuclei - Galactic center - Radio astronomy - black hole physics

Simbad objects: 8

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