Lecture en 2 min.

Vue d’artiste fournie par l’Observatoire européen austral (THAT) the 12 October 2020 montrant une étoile, au premier plan, soumise à une «spaghettification» en étant dévorée au passage d’un trou noir supermassif, sous l’effet de forces de marée. / European Southern Observatory/AFP

For the first time, des astronomes ont pu suivre avec un luxe de détails et une proximité inégalée la «spaghettification» d’une étoile, partly devoured by a black hole, according to a study published on Monday.

The star, of a mass equivalent to that of our Sun, ventured too close to a supermassive ogre, with a mass a million times greater than him.

La plupart s’y perdent corps et bien, literally swallowed up by the phenomenal force of attraction of the black hole, that even prevents light from escaping.

But some experience progressive dislocation, dans ce que les astronomes appellent un effet de nouilles ou spaghettification. In the observed case, the star lost about half of its mass in the space of six months.

«C’est exactement ce qui arrive dans un évènement de rupture par effet de marée», ou TDE, a dit l’astronome britannique Matt Nicholl, from the University of Birmingham, main author of the study.

Approaching, the star first flattens and then stretches under the effect of tidal forces from the black hole, taking the shape of a cigar, a expliqué à l’AFP Stéphane Basa, research director at the Marseille astrophysics laboratory: «Lorsque ces forces dépassent la force de cohésion de l’étoile, celle-ci perd des morceaux qui s’engouffrent dans le trou noir».

One of the main contributions of the study, published in the Monthly Notices of the Royal Astronomy Society, is to better understand how matter is absorbed, in this case in the form of fine filaments.

The ingestion of these cosmic noodles is accompanied by powerful electromagnetic radiation, a light signal that signs the space glutton's package.

They enabled its automatic detection in September 2019, by a host of instruments detecting sudden changes in the luminosity of celestial objects, at about 215 million light years, in the Eridan galaxy.

«Nous avons immédiatement pointé une série de télescopes terrestres et spatiaux dans cette direction pour analyser la source de lumière», a this Thomas Wever, co-author of the study, in a press release from the European Southern Observatory (THAT).

This glow is usually obscured by the curtain of matter, which makes it difficult to observe the phenomenon, according to scientists.

This time, the speed of the reaction and the relative proximity of the event helped lift part of the veil. «Nous avons pu observer un rideau de poussière et de débris s’élever quand le trou noir a projeté un jet puissant de matière à des vitesses allant jusqu’à 10.000 km par seconde», said astronomer Kate Alexander, from Northwestern University, cited by ESO.

Another unpublished observation, selon Mr. Basa, some of the star's material is ejected from the other side of the black hole.

L’astronome valide l’analogie de «pierre de Rosette», which made it possible to decipher the Egyptian hieroglyphics, utilisée par l’équipe du Pr. Nicholl, to qualify his discovery: «C’est un cas d’école pour les observations à venir».

D’autant plus que les TED ne sont pas un phénomène courant. On estime qu’ils ne surviennent qu’une fois tous les dix mille ans dans une même galaxie.

À partir de photos du télescope spatial Hubble et d’un logiciel d’analyse innovant, des astrophysiciens britanniques

Source: https://www.la-croix.com/spaghettification-etoile-trou-noir-suivie-temps-reel-2020-10-12-1301119035

Black hole, Star, Astronomy, Spaghettification, Supermassive black hole

World news – FR – The "spaghettification" of a star by a black hole followed in real time

Building on its expertise in the areas of digital, technologies and processes , CSS Engineering you in your most ambitious transformation projects and helps you bring out new ideas, new offers, new modes of collaboration, new ways of producing and selling.

CSS Engineering is involved in projects each customer as if it were his own. We believe a consulting company should be more than an advisor. We put ourselves in the place of our customers, to align we incentives to their goals, and collaborate to unlock the full potential their business. This establishes deep relationships and enjoyable.

Our services:

  1. Create professional websites
  2. Hosting high performance and unlimited
  3. Sale and video surveillance cameras installation
  4. Sale and Installation of security system and alarm
  5. E-Marketing

All our achievements here https://www.css-engineering.com/en/works/

LEAVE A REPLY

Please enter your comment!
Please enter your name here