juin 8, 2023


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Le télescope spatial Webb révèle la pépinière stellaire la plus riche et la plus proche du système solaire

La région intérieure de la nébuleuse d’Orion vue par l’instrument NIRCam du télescope spatial James Webb. Crédit : NASA, ESA, CSA, réduction et analyse des données : équipe PDRs4All ERS ; S. Fuenmayor traitement graphique

« Orion Bar est une région typique de processus se produisant dans toute notre galaxie et notre univers où les étoiles rayonnent constamment de la matière à proximité », a déclaré Felipe Alarcón. Il est étudiant diplômé à l’UM et membre du groupe international. « Cette superbe photo sera une photo typique. »

De grandes quantités de poussière obscurcissent le cœur des pépinières d’étoiles, comme la nébuleuse d’Orion. Il est donc impossible de les observer en lumière visible à l’aide de télescopes tels que[{ » attribute= » »>Hubble Space Telescope. However, the James Webb Space Telescope observes the infrared light of the cosmos, which can penetrate these layers of dust. 

Many spectacular structures are revealed in the image, down to scales of about 40 astronomical units, or about the size of our solar system. These structures include a number of dense filaments of matter, which could launch the birth of a new generation of stars. Forming stellar systems are also revealed in the image. These consist of a central proto-star surrounded by a disc of dust and gas inside which planets form.

JWST Inner Orion Nebula

Young star with a disk inside its cocoon: Planet forming disks of gas and dust around a young star. These disks are being dissipated or “photo-evaporated” due to the strong radiation field of the nearby stars of the Trapezium creating a cocoon of dust and gas around them. Almost 180 of these externally illuminated photoevaporating disks around young stars (aka Proplyds) have been discovered in the Orion nebula, and HST-10 (the one in the picture) is one of the largest known. The orbit of Neptune is shown for comparison.
Filaments: The entire image is rich in filaments of different sizes and shapes. The inset here shows thin, meandering filaments that are especially rich in hydrocarbon molecules and molecular hydrogen.
θ2 Orionis A: The brightest star in this image is θ2 Orionis A, a star that is just bright enough to be seen with the naked eye from a dark location on Earth. Stellar light that is reflecting off dust grains causes the red glow in its immediate surroundings.
Young star inside globule: When dense clouds of gas and dust become gravitationally unstable, they collapse into stellar embryos that gradually grow more massive until they can start nuclear fusion in their core – they start to shine. This young star is still embedded in its natal cloud.
Credit: NASA, ESA, CSA, Data reduction and analysis: PDRs4All ERS Team; graphical processing S. Fuenmayor & O. Berné

“We hope to gain understanding about the entire cycle of star birth,” said Edwin (Ted) Bergin. He is a U-M professor and chair of astronomy and member of the international research team. “In this image, we are looking at this cycle where the first generation of stars is essentially irradiating the material for the next generation. The incredible structures we observe will detail how the feedback cycle of stellar birth occurs in our galaxy and beyond.”

The Orion Nebula is also home to a cluster of massive young stars, called the Trapezium Cluster, emitting intense ultraviolet radiation, capable of shaping clouds of dust and gas. Understanding how this phenomenon influences the environment is a key question for studying the formation of star systems like our own solar system.

These images are the result of one of James Webb Space Telescope’s priority observation programs, involving about a hundred scientists in 18 countries. 

The JWST is a large infrared telescope with an approximately 6.5-meter primary mirror. With its incredible power, it will be the premier observatory of the next decade and study every phase in the history of the universe. JWST is an international collaboration between NASA, ESA (European Space Agency), and the Canadian Space Agency (CSA).

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