An international team of researchers led by Willem Adrianus Baan from the Xinjiang Astronomical Observatory (XAO) astronomical research team (XAO) found evidence of occasional disc instability in the H2O megamaser NGC galaxy disc. 4258.
Their discovery was published in Nature Astronomy on June 30.
The NGC 4258, also known as the Messier 106, is a close-up galaxy that carries out the outstanding release of the H2O MegaMaser. This discharge was initiated within a fast-moving disc around the active galactic nucleus, but the exact conditions that cause this discharge are not yet clear.
Researchers have conducted experiments in Space Very Long Baseline Interferometry (VLBI) with the Russian-based RadioAstron Observatory on Earth, the world’s largest telescopes in Green Bank, U.S., and Effelsberg, GER. They noted that a series of equally divided clouds within the gas disk surrounding the nucleus of the NGC 4258 was responsible for the release of the H2O MegaMaser.
These SVLBI tests were performed based on connecting the Earth’s space of up to 19.5 meters in diameter and the maximum angular adjustment of 11 micro-arcseconds (3 x 10-9 degrees) with a footprint of only 62 A.U. galaxy itself. The observed extraction molecules were found to rotate inside a small rotating disk at a distance of 0.126 parsecs (0.38 lightyears) from the nucleus of the galaxy’s black hole.
The H2O MegaMaser emitted from these regions results in maser enlargement by happy water / pumped molecules as more clouds are washed away in front of a continuous radio in the nucleus of the NGC 4258. periodic discharge appears to be associated with magneto-rotational rotation instability.
A different rotation of the disk drives this type of shear instability. It has long been thought to regulate the transmission of radial pressure and viscosity within the accretion disk.
This view of SVLBI provided the first detailed view within the tiny disc of Keplerian accretion surrounding the active galactic nucleus.
