Exoplanet detection method also works for extragalactic black holes

Black holes outside the Milky Way are often discovered by X-ray emission, which results from falling toward matter, producing an accretion disk. But for the first time, a black hole outside our galaxy has been discovered using one of the methods for exoplanets, Via The oscillatory motion arising on its host star.

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now we know that black holes There are very common objects in the observable universe. We could only guess in the early 1960s, especially after the performance by Nobel Laureate Roger Penrose of the imperativecollapsing Towards a black hole-type solution of the equation From general relativity NS Star Sufficiently exhausted its thermonuclear fuel.

Today, the best arguments for the presence of black holes are observations. The last one is provided by the comments of M87* by the members of the collaboration. event horizon telescope, But the one who is most confident, Although the final proof is not in our hands yet., this is what is provided by the study of gravitational waves.

a video from the site From Big Bang to Living With comments by Jean-Pierre Luminet and Hubert Reeves. © ECP Group

However, through the rise of astronomy several candidates for black holes were discovered earlier. X-ray, showing that Stars compact that cannot main sequence stars and accretion matter a fellow was torn from the star a Mass more than those allowed by the theory of white dwarfs and neutron stars,

Study of motion of some stars in the center of Galaxy also provided information that can only be explained by assuming the existence of a compact object with a mass of about 4 million solar masses and behaving in many ways like a black hole.

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For the first time, it is a similar method that provides evidence for the existence of a black hole outside our Milky Way, as shown in an article by an international team.astronomers, published in reputed magazine Manarsa, In fact, to be precise, it is a Avatar From radial velocity method used to detect exoplanets, Except that here it is a black hole that is responsible for the oscillations of the host star’s motion, oscillations that manifest themselves as a periodic Doppler shift.

For the first time, astronomers have discovered a tiny black hole outside the Milky Way, when investigating how it affects the motion of a star in its immediate vicinity. This video summarizes the search. To get a fairly accurate French translation, click on the white rectangle at the bottom right. The English subtitle should then appear. Then click on the nut on the right side of the rectangle, then on “Subtitles” and finally click on “Translate automatically”. Select “French”. © European Southern Observatory (ESO)

A stellar black hole less than 100 million years old

As is the case with the Milky Way, it is very large telescope European Southern Observatory (VLT NS’He) who made this discovery possible by instrumental observation Saraswati ,Multi Unit Spectroscopic Explorer, NGC 1850, a open cluster Around 160,000. Of the thousands of stars located on light year In Great Magellanic Cloud, a Galaxy Neighbors of the Galaxy.

Remember that there are also open clusters in our Galaxy. is one of the most famous pleiades (M45). Unlike the globular group, like Messier 9, which is more than ten billion years old, these clusters contain about 100 to 1,000 young stars. They were born in giant molecular clouds located in the disk of our Milky Way. But, since many of these young stars are weakly gravitationally bound, they quickly dissipate, leaving half the clusters less than 200 million years old. Some take longer to go extinct and it is estimated that less than 1% of them survive for two billion years. Our Sun most likely has siblings born with it that are now scattered throughout the Galaxy.,

, The museum allowed us to observe very crowded regions, such as the innermost regions of star clusters, by analyzing the light from each nearby star. The net result is information on thousands of stars at once, which is at least 10 times more massive than any other instrument. ”, explains astronomer Sebastian Kaman in a press release from ESO. He and his colleagues were the first to see a star of 5 solar masses whose characteristic motion seemed to indicate the presence of stellar black hole, This was confirmed by combining data fromoptical gravitational lensing experiment from the University of Warsaw and telescope spatial Hubble, a combination that gave an estimate of its mass for the non-luminous object responsible for the motion of the star, which is of the order of 11 solar masses. Since the NGC 1850 cluster is less than 100 million years old, the black hole found should not be that old.

The method is promising and should allow us to detect and study stellar black hole populations in nearby galaxies and globular clusters, revealing many mysteries on the formation of these populations in galaxies. will be dealt withvery large telescope ,ELT) of ESO in Chile.

This animation explains the method used by a team of astronomers to search for a small black hole outside our galaxy – the first to be found using this technique. He discovered it in the star cluster NGC1850, the image of which is visible at the beginning of the animation. The researchers used museum equipment (Multi Unit Spectroscopic Explorer) NS very large telescope from ESO in Chile to analyze the spectra of thousands of stars in the cluster at the same time. The spectra (represented by colored bars in the video) show the light emitted by stars at different wavelengths and contain information about their chemical composition, temperature and motion. The animation then focuses on one of the spectra, that of a star five times more massive than our Sun. The black lines of its spectrum – due to different chemical elements – go back and forth towards blue and red. This means that the star is getting closer and closer to us from time to time. This allowed astronomers to deduce the presence of a black hole of eleven solar masses, which affects the orbit of the star through its strong gravitational force. © ESO / L. Kalkada, NASA / ESA / M. Romaniello. Acknowledgment: J.C. munoz-mateoso

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