The brilliant physicist in the early 1930s
With his atomic model in 1913 he was one of the founders of quantum theory and because of the influence he would later have on the founders of mechanics…” data-image=”https://cdn.futura-sciences.com/ buildsv6 /images/midioriginal/4/3/e/43e521108b_50141916_bohr-700.jpg” data-url=”https://news.google.com/sciences/personalities/physics-niels-bohr -240/” data-more= ” Read more”> Nobel Prize in Physics in 1922 and another brilliant father of the quantum revolution and .
Chandrasekhar was only 20 years old when he used the famous stat discovered by Enrico Fermi
His most famous contributions are in nuclear physics and the creation of…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/f/9/f/f9fe850bca_50141937_fermi-1000 .jpg ” data-url=”https://news.google.com/sciences/personalities/physics-enrico-fermi-241/” data-more=”Read more”> and Paul Dirac to model interior behavior also mobilization in passing the theory of . Then he discovered there was one limit for . In 1935, the great astrophysicist Arthur Eddington firmly opposed the existence of this limit, not really realizing that it would potentially discredit the young doctor by its prestige.
At first glance, a star is a ball of gas, mostly hydrogen. Nuclear fusion reactions of hydrogen at the star’s center release energy. In other words, heat radiating in the form of red, yellow, or blue light… So whether they’re brown dwarfs or red dwarfs, a star’s mass determines its luminosity, that is, the luminosity it radiates in all directions. © CEA Research
and despite the sense of injustice experienced by Chandrasekhar, the two men will respect each other afterwards and as it is also called, will even write . It must also be said that Chandrasekhar had sought the opinion of Niels Bohr, who, given his size as a Nobel laureate, had replied that he should not worry and that he absolutely did not understand the reasoning Eddington used to reject Chandra’s calculations which he and his Belgian collaborator, the physicist Léon Rosenfeld, believed to be absolutely correct. Chandrasekhar finally published in the late 1930s .
All this to say that the Niels Bohr Institute has a tradition of excellent astrophysics and that this institute’s recent communication on an article published in is to be taken seriously The Astrophysical Journal and which can also be viewed freely at.
The stars of 140,000 galaxies across billions of light years
This is a discovery made by analyzing stellar populations in about 140,000
Invention of X-rays
The discovery of…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/d/0/d/d0d21d96c0_50034252_372px-backscatter-x-ray-image-woman-02. jpg” data-url=”https://news.google.com/science/definitions/physics-x-ray-1002/” data-more=”Read more”> to that of the waves thanks to most great spacecraft and a number of large ground-based telescopes. Over 2 million galaxies have been discovered, covering 75% of the age of The universe’s history begins about 13.7 billion years ago in an extremely dense and hot soup. The laws of physics as we…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/1/5/5/1557798396_80921_universe.jpg” data-url=”https : //news.google.com/sciences/definitions/astronomy-universe-15239/” data-more=”Read more”> .
The explosion of very massive stars in gravitational supernovae enriches the interstellar medium with the chemical elements synthesized by nuclear fusion, while the collapse of the stellar core creates a neutron star or black hole. The transition between the collapse of the core and the ejection of the stellar envelope is a challenge for the theoretical understanding of supernovae. A hydraulic experiment designed and carried out at the CEA made it possible to reproduce by analogy one of the phenomena of hydrodynamic instability that facilitates the explosion. This experimental approach is complementary to numerical simulations. Check out this animation experience. This animated film was produced and co-funded by CEA and ERC and directed by Studio Animea. Scientific and technical design: T. Foglizzo, J. Guilet, G. Durand (CEA). © CEA Research
The galaxies studied by thefrom the University of Copenhagen and the Niels Bohr Institute are far from 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” > sometimes several billion . For the first time it was possible for such distant galaxies to compile statistics on the populations of stars in a certain mass range and, above all, to compare them with those that have been determined in the Milky Way for decades. For example, we know that our galaxy is largely dominated by Since their luminosity is very low (at most about 1% that of the Sun), the smallest of them must…” data-image=”https:/ / cdn.futura- sciences.com/buildsv6/images/midioriginal/d/b/d/dbdabe04e7_50034118_gliese-581-dwarf-red-eso.jpg” data-url=”https://news.google.com/sciences/definitions /astronomy-red -dwarf-31/” data-more=”Read more”> .
Technically the published article
The wavelengths of visible light range from about 380 nm (violet) to 780 nm (red). The visible spectrum is…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/b/6/9/b697a0c09f_85912_lumiere.jpg” data-url=”https:// news.google.com/science/definitions/physics-light-326/” data-more=”Read more”> emitted by galaxies at different . Large, massive stars are bluish, while small, low-mass stars sometimes have the color…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/ 9/5/7951943cc1_85596_color .jpg” data-url=”https://news.google.com/sciences/definitions/physics-color-4126/” data-more=”Read more”> more yellow or red. This means that by comparing the distribution of blue and red in a galaxy, one can determine the distribution of large and small stars.
An effect of the chemical evolution of galaxies?
It now appears that the IMF of distant galaxies is not the same as that of the Milky Way and that they contain more massive stars, with the proportion increasing with increasing distance from our galaxy. This is not necessarily surprising, since the theory of stellar structure and evolution tells us that very massive stars that explode in 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”>
Symbol: H Atomic number:…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/3/8/8/38807f95a1_50010101_equinoxprom-eit-big.jpg” data-url = “https://news.google.com/sciences/definitions/chemistry-hydrogen-14495/” data-more=”Read more”> and helium to the left of the , nuclei that distribute these explosions in the interstellar medium. Now it forms in the clouds
The amount…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/b/7/e/b7e2382b95_59611_mer-nuages-seblino-camptocamporg-cc-30.jpg” data -url=”https://news.google.com/planete/definitions/climatologie-nuage-14525/” data-more=”Read more”> Molecules enriched in these heavy nuclei that will form new stars. So over billions of years, galaxies will evolve chemically, and we know that the composition of heavy elements in turn affects the mass of the stars that can form.
Therefore, as foresight is early in astrophysics, one could predict that the IMF of galaxies billions of years ago would likely not be the same as that measured in our galaxy today. But we didn’t have the proof yet, due to a lack of sufficient observation quality.
” The mass of the stars says a lot
The term emergence is used in many areas.
Outside…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/4/e/f/4ef87a3a65_50036395_papillon-chrysalis-bernard-schmeltz.jpg” data-url=” https ://news.google.com/planete/definitions/zoologie-emergence-8743/” data-more=”Read more”> massive stars. Therefore, our result means that we have to revise many assumptions, because distant galaxies look very different from ours. “, explains in the press release of the Niels Bohr Institute Albert Sneppen, PhD student at the Niels Bohr Institute and first author of the published study.
” We could only see the tip of the iceberg, and we’ve known for a long time that expecting other galaxies to look like ours wasn’t a particularly good assumption. However, nobody has been able to prove that the other galaxies form different star populations. This study enabled us to do exactly what could open the door to a deeper understanding of how galaxies form and evolve. “, adds.
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