See what binary systems with black holes in the Milky Way look like

Recently one joint press release from European Southern Observatory (ESO) andEvent Horizon Telescope (EHT) has announced that on May 12, 2022, there will be an online conference at. 15.00 in France, which will report new results and especially about supermassive black hole of The Milky Way. It contains just over DKK 4 million masses solar energy and like all other supermassive black holes, it is not known how it is formed. We are also not sure thatstar compactly rinsed out to the middle of ours Galaxy with this mass there is actually a black hole, although it seems very likely.

On the other hand, we know many other stars of this kind, but far less massive, which are also considered to be black holes in the Milky Way. Their origin is much less mysterious, as they are so-called star-mass black holes, which generally contain between 5 and 15 times the mass of Sun.

Let’s come up with a few reminders about these the black holes of the stars takes up what Futura had explained about them in a previous article.

When a star larger than 8 solar masses gravitationally collapses after depleting its nuclear fuel and still contains at least more solar masses despite win violent star particles at the end of life that ejected a significant portion of its original mass and in particular its explosion in supernova SN II at that timespace time inside this star becomes dynamic and very similar to that of the observable universe during big bang. The big difference, of course, is that in the first case, the space is in contraction, while in the second, it is in expansion.

L ‘collapse of the star will sometimes lead his fabric to go below the surface ofevent horizon black hole with mass corresponding to the final star, which actually means that the star turns into a black hole. In the early 1960s, two teams of researchers, American and Russian, showed up computer that the formation of this horizon was completely credible based solely on the laws of physical known at the time. On the contrary, these numerical simulations and other analytical calculations did not really tell what happened at the end of the gravitational collapse, below the event horizon.

Black holes, laboratories for basic physics

It is the Nobel Prize Roger Penrose which will finally demonstrate in 1965 that if we believe in equations of the theory of general theory of relativitya point of infinite density and curvature of space-time, which is equal, must appear as a singularity of space-time, and this in contrast to the calculations of two physicists legendary Russians who claimed the opposite, Evgeny Lifshitz and Isaak Khalatnikov.

However, quantum effects and new physics of matter and forces would intervene and would likely change the situation. But just as the collapse of a star in a black hole is in a way the reverse of the expansion of the observable universe at the time of the Big Bang, a gravitational singularity must have appeared at the very beginning of the existence of cosmos or just avoided. Probably because of the laws of a quantum theory of gravity can describe what John Wheelerthe inventor of the word black hole, calledspace-time foam and which is the subject of the last work of Jean Pierre Luminet.

Black holes are among the most opaque objects in the universe. Fortunately, however, they are among the most attractive, and it is by their exaggerated appeal that we can discover them. Giant black holes are the most monstrous ogres in the cosmic zoo, but they are not weapons of mass destruction. The rays of matter they produce would have helped ignite the first stars and form the first galaxies. Hubert Reeves and Jean-Pierre Luminet, specialists in modern cosmology, answer all your questions. Visit the site to find out more From the big bang to the living. © ECP-YouTube Group

From the late 1960s, the program was executed to understand the origin of the universe and to cast a new one light on man and his place in nature was therefore clear, it was necessary to study the physics of black holes and understand the finite state of the collapse of fabric-space-timeto use the title of the famous general theory of relativityHerman Weyl.

But as an introduction to this program, of course, a question arose. Do these black holes really exist?

A first element of reaction arrived during the year 1971, when observations made possible by the evolution of radio astronomy and X-ray astronomy began to accredit the idea that the compact star exceeded the mass limit approved by the existence of a neutron starand who was with orbit about a super giant star blue in the Milky Way towards Constellation you Cygne, could be a black hole. The source X was discovered, and by extension the black hole and even the binary system that contains it was called Cygnus X1.

As Jean-Pierre Luminet explains in the video above, it is the X-rays emitted by matter torn from a companion star by tidal forces and which is heated by forces of viscous friction which form a growth disk as it spirals towards the black hole which betrays its presence. An isolated star-black hole would not emit any radiation, even according to the process discovered by stephen hawking because in the present universe it is still too cold in relation to the fossil radiation.

A zoo with the stars’ black holes in the Milky Way

Other candidates for the title of black stars have since been discovered in the Milky Way, always flushed out emissions of X-rays. That Nasa presents them to us today with a series of animations showing around twenty Binary X-ray systems that host confirmed black holes. These systems are shown on the same scale, but with gear accompanying stars in orbit accelerated about 22,000 times. The view of each system reflects how we view it from Earth. Temperatures rise as they approach the edge of the growth disk with consequent emissions in the visible, theultraviolet and finally X-rays.

Star colors ranging from blue-white to reddish represent temperatures 5 times warmer to 45% cooler than the surface of our sun. In most of these systems, a stream of material from the star and torn by tidal forces forms a growth disk around the black hole. In others, such as the famous system called Cygnus X-1, the star produces a kind of strong substance wind, which is partly captured by the gravity of the black hole and also forms a disk there. Accretion disks use a different color palette because they have even higher temperatures than stars. The largest represented disk belonging to a binary called GRS 1915 extends over a distance greater than that which separates Mercury from our sun. However, the black holes themselves are depicted larger than they actually use scaled spheres to reflect their masses. © NASA’s Goddard Space Flight Center and Scientific Visualization Studio

Here are some more specific examples taken from the previous video and indicating the distance to Solar systemthe masses of black holes and accompanying stars, often giants, which will evolve rapidly in a few million years before exploding into a supernova, which could give rise to binary black holes, but not always, already because the extra star could be a neutron star, and that the explosion could separate the two celestial bodies.

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