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Hotspot in the Sagittarius Black Hole neighborhood A *

Astronomers have discovered a hot spot orbiting the supermassive black hole Sagittarius A * at high speed!

The modeling results from data on hot bubbles or hot spots surrounding the supermassive black hole Sagittarius A *. Source: EHT collaboration, ESO / M. Kornmesser (Thanks: M. Wielgus)

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The modeling results from data on hot bubbles or hot spots surrounding the supermassive black hole Sagittarius A *. Source: EHT collaboration, ESO / M. Kornmesser (Thanks: M. Wielgus)

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The modeling results from data on hot bubbles or hot spots surrounding the supermassive black hole Sagittarius A *. Source: EHT collaboration, ESO / M. Kornmesser (Thanks: M. Wielgus)

At the center of the Milky Way there is a supermassive black hole ready to plunder the surrounding matter. And astronomers have even managed to photograph this predatory monster.

Black hole Sagittarius A * (Sgr A *) was successfully photographed by a network of radio telescopes in collaboration with the Event Horizon Telescope (EHT). This collaboration uses eight radio telescopes scattered around the world to combine interferometry techniques and become an Earth-sized radio telescope to photograph the black hole at the center of our galaxy.

As a result, astronomers were able to photograph a black hole or more precisely the shadow of a black hole surrounded by a ring of light.

Apparently, the ALMA (Atacama Large Millimeter / submillimeter Array) radio telescope was also able to observe the presence of a hot spot or rather a hot bubble moving around the black hole Sgr A * at the center of our galaxy.

This hot bubble is estimated to be the size of the planet Mercury. The size may be “small” but not with the speed. The boiling bubble took only 70 minutes to circle around the black hole of Sgr A *! This means that the hot bubble moves at about 30% of the speed of light, which is about 90,000 km / s.

This discovery is obviously interesting because astronomers can study the environmental dynamics of the supermassive black hole at the center of the Milky Way!

Hotspot in the radio wavelength

This hot bubble surrounding Sgr A * was discovered when the ALMA radio telescope took part in the EHT collaboration to photograph the monster at the center of our galaxy.

Apparently, there is hidden data that could reveal the behavior of black holes. These data exist only in the observations made by ALMA from the Andes in Chile.

These hot bubbles are found in the ALMA data. Inevitably, this high-speed hot bubble is also a clue to understanding the behavior of black holes.

However, there are other observations that help astronomers understand the origin and behavior of these hot bubbles.

The Chandra Space Telescope observed a glow of X-ray energy emitted by an explosion in the center of our galaxy. These flares are what we know as hot spots or rather hot gas bubbles that orbit the black hole at high speed. In general, heat waves like this are only observed by telescopes working at X-ray and infrared wavelengths.

Interestingly, these hot gas bubbles can be seen at radio wavelengths. Astronomers suspect that when this hot spot that emits infrared light cools, the hot gas bubble can be seen in radio wavelengths and is observed by ALMA and the EHT network.

Origin

The glow ejected from the explosion at the galactic center is thought to have originated from the magnetic interaction of the hot gas surrounding the black hole Sagittarius A * at a very close range.

The discovery of a high-speed hot bubble orbiting Sagittarius A * is evidence to support this hypothesis. Not just that. The results of the observations also provide clues to the geometry of the process. And this can be used to build a theoretical interpretation of glow formation near supermassive black holes.

To understand the origin of these hot gas bubbles, astronomers studied the polarization of the radio beam of Sgr A *. The goal is to discover the magnetic field of the black hole. These observations are then used with existing theoretical models to understand the formation of hot spots and the environment in which hot gases exist. From here, astronomers can also study the magnetic field around Sagittarius A *. The goal is to understand the behavior of black holes and their environment.

Consequently, these observations confirm the observations in infrared wavelengths made with the GRAVITY instrument on the VLT. The GRAVITY and ALMA data both show that the glow originates from a plume of gas surrounding the black hole clockwise at about 30% of the speed of light.

Further observations in the future should be made to follow the hotspot in various wavelengths or observations at multiple wavelengths. Furthermore, it is hoped that the EHT network will also be able to observe the hot gas plume so that more data can be obtained to understand the environment around the monster at the center of the galaxy.

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