This is what the activity of the giant black hole in the middle of the Milky Way would look like

A new technique to account for the rapid flicker of heated, bright matter that falls on the Milky Way’s supermassive black hole has sorted several growth models for this compact star. The model selected by the observations is one of those that can be simulated and therefore gives an idea of ​​what we should see in a few years with films showing the activity of the plasma radiating around Sgr A *, from images taken by members of the partnershipEvent Horizon Telescope.

The picture with a solution registration of the immediate environment supermassive black hole center of The Milky Way, aka Sgr A *may indicate that this environment is quite calm, unlike those in the giant black holes behind the active nuclei in galaxies and especially those who are quasars. But it’s nothing.

In fact, we thought we had pictures of Sgr A * at the same time as M87 *. But we had to be enchanted because of the radiation in the area radio collected by the instruments of cooperation Event Horizon Telescope (EHT) on the scale of our blue planet (and combined with skilled signal processing techniques that make it possible to perform what is called opening synthesis by interferometry as if we had a single Earth-sized instrument) turned out to oscillate much faster in time than we had imagined. It had therefore taken longer to extract from the observations a characteristic picture of Sgr A * and its immediate surroundings, in addition to the purely fluctuating data. Perhaps we can make a comparison with the difficulty of getting a clear picture of an object in front of which has been depositedair hot and turbulent.

Nevertheless, the speed of these fluctuations means that in the very near future we should be able to obtain real films of the activity in the central black hole of the Milky Way. In addition, a signal which is noise in astrophysics for some measures and a source of information for others.

In a recent article submitted to Astrophysical journal letters but which can be read freely on arXiv, Sean Ressler from UC Santa Barbara, Lena Murchikovaof’Department of Advanced Studies, and Chris Whitealso from Princeton University, was able to use the subtle, turbulent flicker from the Sgr A * image to build the hitherto most accurate model of the Milky Way’s supermassive black hole, providing insight into the properties of fabric falls against it, such as its structure and its movement.

The three researchers also relied on this numerical simulations possible models of the black hole fabric supply and the consequences this has on the flicker of the radio radiation they produce. It is also the consequences of several articles by the three astrophysicists have been publishing with their colleagues for some years. One of the simulations that gives a representation of what a film with supermassive black hole activity over 4 million could look like masses sunbeams from the Milky Way can be seen in the video below.

This simulation shows a possible film, spread over about fifty hours and zoomed out, at the end of a day, of the fluctuations in the radiation from the gas falling towards the horizon of the events in the central black hole in the Milky Way Sgr A *. © Chris White, Princeton University

Several possible growth models for Sgr A *

The simulations ofgrowth of matter for a rotating supermassive Kerr black hole in the heart of active galactic nuclei involves a slice of matter surrounded by a torus of gas of dust, as the attraction of gravity disappears over time. The discs and tori can be provided with material of giant filaments of cold matter falling on galaxies or by one star massive passage too close to the black hole. It will then be destroyed by tidal forces of the supermassive black hole that gives rise to what in English is called the phenomenon Incident with tide interruption (or TDE), which can be translated as “tidal rupture event”.

However, the black hole Sgr A * does not produce one active core of galaxies. According to the joint work of the three astrophysicists, the model that provides simulations that best adheres to the observed flicker of Sgr A * is the one derived from win of fabric produced by a few tens of type stars Wolf-Rayet (hot stars on dozens of solar masses) orbiting the supermassive black hole. Accretion therefore produces neither disk nor torus, and the most accurate model also assumes that the giant black hole in our galaxy does not rotate.

Ressler’s contribution comes from a time he spent years constructing the most realistic simulations to date of the gas around Sgr A *. He did this by incorporating observations of nearby stars and tracking the material they release as they orbit the black hole. Murchikova has developed a method for studying the flicker of black holes on a time scale of seconds. White, on the other hand, had worked on the details of what happens to gas near black holes when the effects of strong gravitational fields, which are necessarily described by the general theory of relativity, are important, which affects light which comes to us.

To learn more about the observations already made with EHT and what they involve, one can read the comments in two articles that Futura published during the presentation of the first image of Sgr A *, and which one must at. Francoise Combes and Jean Pierre Luminet.

  • The picture reveals the supermassive black hole in the Milky Way commented by Jean-Pierre Luminet
  • The image of the Milky Way’s giant black hole commented on by Françoise Combes

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