Cette impression d'artiste montre à quoi pourrait ressembler le système binaire VFTS 243 si nous l'observions de près. Le système, qui est situé dans la nébuleuse de la Tarentule dans le Grand Nuage de Magellan, est composé d'une étoile chaude et bleue avec 25 fois la masse du Soleil et d'un trou noir, qui contient au moins neuf fois la masse du Soleil. Les tailles des deux composants du système binaires ne sont pas à l'échelle : en réalité, l'étoile bleue est environ 200.000 fois plus grande que le trou noir. Notez que l'effet de « lentille » autour du trou noir est montré à des fins d'illustration uniquement, pour rendre cet objet sombre plus visible dans l'image. L'inclinaison du système fait qu'en le regardant depuis la Terre, on ne peut pas observer le trou noir éclipsant l'étoile. © L. Calcada, ESO

A “sleeping” black hole discovered for the first time outside our galaxy

Black holes have become common in the media landscape of recent years and despite the enigmas that still surround them and that touch on very profound questions of theoretical physics, they are commonly considered in astrophysics and in cosmology. We even studied their emissions They propagate at the speed of light transporting energy. We can compare them…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/f/4/c/f4c81d66a7_86131_ligo-fusion-trou-noir-ligo-nsf-aurore -simonnet .jpg” data-url=”https://news.google.com/sciences/definitions/physics-gravitational-wave-4003/” data-more=”Read more”>gravitational waves due to collisions with others Here is a list of celestial objects that can be called celestial bodies (not…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal / 6/c /c/6cc6562b02_127395_astre-c-esa-hubble-nasa.jpg” data-url=”https://news.google.com/sciences/definitions/etoile-astre-851/” data-more=” Read Next”>stars relativistic deals. Recently, We have even obtained images of its surroundings with radio telescopes that reveal the existence of what is believed to be an event horizon.which is the very definition of a black hole when it is a closed surface.

It is true that definitive proof of the existence of black holes still eludes us. but its presence is doubted in certain corners of the Earth, only a cross section can be observed…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/ midioriginal/7/ 7/7/777b761907_120668_voie-lactee-galaxie.jpg” data-url=”https://news.google.com/sciences/definitions/universe-voie-lactee-3729/” data-more=”Read more”>Milky Way and the galaxies they are increasingly difficult to justify. What contrast with the beginning of the 1960s when only a handful of visionaries, such as John Wheelertook these solutions from equations However, it also brings a new conception of space and time, in which gravitation becomes a geometric property of…” data-url=”https://news.google.com/sciences/definitions/ physics -relativity-general- 3572/” data-more=”Read more”>general relativity seriously even Einstein No.

However, the first candidates for the title of black holes were eliminated during the 1970s, in the form of binary system where a stellar black hole, ie produced by When this collapse refers to coherent rocks, we can also speak of a rock slide.
The result of this…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/f/6/7/f678fd3677_50035322_eboulement-cmic-blog-cc-nc-2.jpg ” data-url=”https://news.google.com/planet/definitions/sustainable-development-landfall-6515/” data-more=”Read More”>to collapse gravity of a star probably at least 30 masses solar rays, was also a powerful source of X-rays by increasing organic matter, nitrogenous matter, etc.
There are different families like:

organic matter, which constitutes living beings (animals or plants) or…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/7/0/e70ccaaf4a_91935_matiere. jpg” data-url=”https://news.google.com/sciences/definitions/matiere-matiere-15841/” data-more=”Read more”>matter of its companion star.

This matter, spiraling towards the black hole, actually forms a compact disk where the forces of viscous friction between the spirals of gas adjacent areas give off heat. Physicists refer to heat as thermal energy. In the international system, therefore, it is measured in joules (J). Heat corresponds more precisely to a transfer…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/3/5/735709801b_92578_chaleur.jpg” data-url=” https ://news.google.com/sciences/definitions/physics-heat-15898/” data-more=”Read more”>heat to the point of producing a glowing hot plasma in the X-ray range.

Black holes are among the most opaque objects in the Universe. Fortunately, however, they are among the most attractive, and it is because of their excessive power of attraction that we can detect them. Giant black holes are the most monstrous ogres in the cosmic zoo, but they are not weapons of mass destruction. The jets of matter they produce would have helped ignite the first stars and form the first galaxies. Hubert Reeves and Jean-Pierre Luminet, specialists in contemporary cosmology, answer all your questions. For more information, visit the site From the big bang to life. © ECP Group, YouTube

However, we know that most stars form binary systems, so we should expect there to be a certain number of these. binaries X in the Milky Way. However, it is also possible that the distance between a stellar black hole and its companion star is such that no appreciable transfer of material occurs. So there is no diskaccretion and no X-ray emission, too, for example because the star has not yet become a red giant that has expanded to the point of overflowing what is called its Roche lobe, named after the mathematician and astronomer 19th century frenchme century.

The first peak to emerge from a population of dormant black holes

This type of stellar black hole is said to be ” asleep and so far none have been detected. That has just changed thanks to an international team of astronomers who used the Flames instrument for their discovery (Fiber Large Array Multi-element Spectrograph) in In 1993, ESO launched the VLT (Very Large Telescope) project and decided to install it at the Cerro Paranal site in the Chilean Andes, where the climate is particularly favorable for astronomical observations. It is…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/f/0/7/f073110cb2_50034377_vlt.jpg” data-url=”https://news.google .com/sciences/definitions/universe-vlt-2147/” data-more=”Read more”>VLT of’IT’SAs the researchers explain in an article published in nature astronomy.

To do this, they had to turn the VLT’s gaze towards the nebula of the Tarantula located in the Large Magellanic Cloud, a neighboring galaxy to ours. Six years of observations took the team led by Tomer Shenar, who began this research at KU Leuven in Belgium and is now a Marie-Curie Fellow at the University of Amsterdam in the Netherlands.

The candidate for the title of sleeping black hole has been named VFTS 243. It contains at least nine times the mass of our own. The Sun is the closest star to Earth, from which it is approximately 150 million kilometers away. The Sun is 8.5 kparsecs from the center of the Milky Way. In stellar classification, the sun is a G2-type star.
The mass…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/1/d/9/1d9cd1d45f_50034577_eruption.jpg” data-url=”https://news. google.com/sciences/definitions/univers-soleil-3727/” data-more=”Read more”>Sun and revolves around a hot blue star that weighs 25 times the mass of the Sun. Surprisingly, it is not accompanied by perceptible traces of the remains of an explosion of Excerpt from…” data-image=”https://cdn.futura -sciences.com/buildsv6/images/midioriginal/a/9/4 /a940132305_50034136_supernova1987a.jpg” data-url=”https://news.google.com/sciences/definitions/universe-supernova-60/” data-more =”Read more”>supernova (more precisely ME’orbit almost circularand the kinematics of VFTS 243 imply that the collapse of the parent star into athe black hole was associated with little or no ejected matter) suggesting that, as previously thought, a gravitationally collapsing star can sometimes directly become a black hole without going through the supernova stage.

The star that formed the black hole of VFTS 243 appears to have completely collapsed, with no signs of an earlier explosion.explains Tomer Shenar in an ESO statement in which he adds, Evidence for this “direct collapse” scenario has only recently emerged, but our study provides possibly one of the most direct indications. This has huge implications for the origin of the melting point of water, in other words, the temperature at which ice melts…” data-image=”https://cdn.futura-sciences .com/buildsv6/ images/midioriginal/ 7/d/0/7d0df59f3c_82086_fusion.jpg” data-url=”https://news.google.com/sciences/definitions/physics-fusion-15305/” data-more=” Read more”>mergers black holes in the cosmos. »

For a fairly accurate French translation, click on the white rectangle at the bottom right. Then the English subtitles should appear. Then click on the nut to the right of the rectangle, then on “Subtitles” and finally on “Auto translate”. Choose “French”. © European Southern Observatory (IT’S)

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