Monday , January 18 2021

Curtain piercing of our black hole



Astronomers have removed rock interstellar gas interference to get an overview of gas surrounding the central black hole of the galaxy.

The radio telescope working around the globe has given us a new look on the hot gas around our Galaxy Middle Black Black Hole, Sagittarius A *. Observations suggest that the compact glow we have is either from an acoustic disk like a Tigger around Sgr A * or we're shooting at a jet directly from the black hole.

Simulated and actual images of SGR *

The radio photon traveling through our central black hole in the Milky Way is interrupted by interfering with unstable gas. The top row shows (left) SG * Around 88 GHz, an unmaxed simulated and (right) when the image will appear. The row below shows the same effect, but for the real observations of SGR A * in the sky: we will see that, the original has left the person with an image.
S. Isaun, M. Mohesisibodka (Redbud University) / M. D. Johnson (Cfa)

SGR * takes the name of an unusual radio source discovered in the Black Hall position in the center of the galaxy in 1974 *. Radio astronomers have tried these decades for a glimpse of the radio-amatizing plasma structure, which pays the black hole, but black and white us and the black hole fools the imagery, which blocks the image. There is also an added problem that, about 26,000 light-years away, SGR * is a small target – the same as the tennis ball on the moon visible from Earth. Astronomers are able to overcome these challenges by combining observations through a worldwide network of radio dishes worldwide to create virtual, planetary-shaped telescopes.

Astronomers are actively working to use a telescope network so that it announces silhouette of Ag * A in a hot plasma. This effort, known as the Event Horizon Telescope (EHT) project, is expected to announce early results this year.

EHT, Good Isown (Redbud University, the Netherlands) and colleagues have used other lesser, more frequent radio observations to map and subtract the texts' glow scattering effect as a supplementary supplement, and creating an image of gas in this region.

Using the observations from 12 radio telescopes in the Northern Hemisphere, together with 37 Elma dishes working in concerts in Chile, the team falls into the heart of Milky Way. The result was high resolution of data and enabled Michael Johnson (developed by the Harvard-Smithsonian Center for Astrophysics) technology to defeat scattering and rearrange image of the area around the black hole.

Acceptable, the reconstructed image does not look like an eye: just a glowing circle. But its small size – it spreads a distance which is only 12 times the radius of the black hole – and the symmetrical shape tells us that we are looking at the gas near the black hole, perhaps in the disk or in the "barrel" seen in the jet.

By the few months ago, most astronomers would have thought that Sgr * * has intertwined so much on our line of sight that we are seeing the crown of his head. But recent observations with gravity tools on Very Large Telescope Interferometer also indicate that we pay attention to our black hole.

It can be good news for EHT scientists who can take a simple time to get rid of the black hole shadow from the top perspective. Regardless of, observations of Issaoun, reported on 20th January Astrophysical Journal, Showing that the disorganization of long-term study of our black hole is ultimately managed and will not prevent the main function of EHT.

Reference:

S. Isown et al. "Size, Shape, and Sagittarius Skating A * 86 GHz: First VLBI with ALMA." Astrophysical Journal. January 20, 2019


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