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 “dormant” black hole discovered for the first time outside of our galaxy

Black holes have become commonplace in the media landscape in recent years and despite the mysteries that still surround them and touch on very deep questions of theoretical physics, they are widely considered in astrophysics and in astrophysics cosmology. We even study theirs emissions They propagate at the speed of light and carry 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 on the occasion of collisions with others Here is a list of celestial objects that can be called celestial bodies (no…” 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 more”>Stars relativistic compacts. Lately, We’ve even received images of their surroundings using radio telescopes, revealing the existence of a putative event horizonwhat the actual definition of a black hole is when it is a closed surface.

However, there is still no definitive proof that black holes exist. but doubting their presence 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 galaxies are becoming increasingly difficult to justify. What contrast beginning in the 1960s when only a handful of visionaries, such as John Wheelertook out these solutions equations However, it also brings a new notion of space and time in which gravity becomes a geometric property of…” data-url=”https://news.google.com/sciences/definitions/physics-relativity-general- 3572/” data-more=”Read more”>general relativity even seriously Einstein Not.

The first contenders for the title of black hole, however, were washed out in the 1970s in the form of one binary system where a stellar black hole is formed, i.e. from If this collapse involves cohesive rock, one can also speak of a landslide.
The result of that…” 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/planete/definitions/sustainable-development-landfall-6515/” data-more=”Read more”>collapse gravity of a star probably at least 30 crowds Solar rays, was also a strong source of X-rays through accretion of organic matter, nitrogenous matter, etc.
There are different families like:

organic matter representing living beings (animal or plant) 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 from its companion star.

This matter, as it spirals towards the black hole, actually forms a compact disk in which viscous frictional forces act between the spirals gas neighboring surfaces emit heat, physicists refer to heat as thermal energy. In the international system, it is therefore measured in joules (J). Heat more closely corresponds 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”>warmth to the generation of a bright, hot plasma in the X-ray range.

Black holes are among the most opaque objects in the universe. Luckily, however, they are among the most attractive and we can recognize them by their overpowering attraction. 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 produced would have helped ignite the first stars and form the first galaxies. Hubert Reeves and Jean-Pierre Luminet, specialists in contemporary cosmology, will answer all your questions. To learn more, visit the website From the big bang to the living. © ECP Group, YouTube

However, we know that most stars form binary systems, so we have to assume that there are a certain number of them binaries X in the Milky Way. However, it is also possible for a stellar black hole to be so far away from its companion star that no appreciable transfer of material takes place. So no hard driveaccretion and also no X-rays, because the star has not yet become one, for example red giant which has expanded until it overflows the so-called Roche lobe, named after the mathematician and astronomer French 19th centurye Century.

The first apex of a population of dormant black holes to appear

This type of stellar black hole is said to ” Sleep and so far none had been discovered. 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) on the 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…” 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’ITas the researchers explain in an article published in natural astronomy.

To do this, they had to focus the VLT’s gaze on the fog the tarantula is in the Large Magellanic Cloud, a neighboring galaxy of our own. Six years of observations were required for the team led by Tomer Shenar, who started 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 dormant black hole has been dubbed VFTS 243. It contains at least nine times the mass of our earth. The sun is the closest star to the earth, from which it is about 150 million kilometers away. The Sun is 8.5 kParsecs from the center of the Milky Way. In the 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 25 times the mass of the Sun. Remarkably, it is not accompanied by conspicuous traces of the remains of an explosion from 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 (Slightly more precise I’orbit almost roundand the kinematics of VFTS 243 implies that the collapse of the progenitor star in athe black hole was associated with little or no ejected matter) suggesting that a gravitationally collapsing star can sometimes become a black hole directly without going through the supernova stage.

The star that formed VFTS 243’s black hole appears to have collapsed completely, with no evidence of a previous explosionexplains Tomer Shenar in an ESO statement, adding: Evidence for this “direct collapse” scenario has surfaced recently, but our study provides arguably one of the most direct clues. This has huge implications for the formation of the melting point of water, which is 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 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 “Translate automatically”. Choose French. © European Southern Observatory (ESO)

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