Une galaxie de l'Amas de la Vierge, Messier 99. © Adam Block, Mount Lemmon SkyCenter, University of Arizona

Hubble revealed strange blue ‘spots’ of young stars

the astrophysicists working on the puzzle black matter They are looking for dwarf galaxies that contain dark matter but are probably too faint to have escaped earlier detection. the standard cosmological model predicts the existence of a large number of these galaxies dwarf around large galaxies like Earth’s, only a cross section can be seen…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/7 / 7/ 777b761907_120668_milkyway-galaxy.jpg” data-url=”https://news.google.com/sciences/definitions/universe-milkyway-3729/” data-more=”Read more”>Milky Way.

It is possible to hunt these dwarf galaxies, and more generally faint galaxies near our galaxy using radio telescopes like the ones on the net very large array in New Mexico (USA). Technically speaking, it is about studying the radiation radio by cloud formation
The quantity…” 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”>clouds of gasfor instance via the famous 21 cm hydrogen line. Several promising gas clouds that could be associated with faint dwarf galaxies have been discovered by the group ofastronomers led by Elizabeth Adams of the Netherlands Institute for Radio Astronomy.

These gas clouds were thought to be associated with the Milky Way, and most of them probably are. But when the teams, with researchers like David Sand, an associate professor of astronomy at UArizona, or Michael Jones, a postdoctoral researcher at theArizona Steward Observatory and lead author of a paper on these clouds and deposited freely at arXiv — wanted to search stars associated with them and the dwarf galaxies, they held surprises.

Thus, an unprecedented association of young blue stars forming a group called SECCO1 and observed with telescope Hubble was actually in thegalaxy cluster de la Virgen Located at an estimated distance between 48 to 72 millionLight yearswas discovered by the famous French astronomer Charles Messier (1730-1817) known for creating the famous catalog of deep-sky objects that bears his name.

Two hypotheses about the origin of the mysterious “blue spots”

Other observations made with Hubble and the instruments of In 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 observation. observations. It is…” 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 de Eso en Chile revealed the existence of “A 1988 science fiction film, The Blob, describes the invasion of Earth by an extraterrestrial creature with such a morphology (larger and more acidic).” data-url=”https://news.google.com/planete/definitions/zoologie-blob-5469/” data-more=”Read definition”>stains similar plans with features never seen before. Thus, most of the stars in each system are very blue and very young, rich in heavy elements that astrophysicists call In contact with an acid, a metal gives a salt; in contact with oxygen it gives an oxide (with difficulty for “noble metals” such as gold,…” data-url=”https://news.google.com/sciences/definitions/matiere-metal-3877/ ” data-more=”Read more”>rails which are, in reality, simple nuclei different from those of General
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”>hydrogenThe general
Symbol: He Atomic number: 2 Electrons per energy level: 2 Atomic mass: 4,003 u Most stable isotopes:…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/ 9 / a/e/9ae62bedde_70382_zepplinheliumjpg.jpg” data-url=”https://news.google.com/sciences/definitions/chemistry-helium-4813/” data-more=”Read More”>helium and them isotopesall bathed by clouds containing very little atomic hydrogen thus forming at the end of structures the size of a dwarf galaxy.

the article about arXiv thus it reports five blue “spots” that are distant from the Milky Way and distant galaxies in the cluster of The passage of a…” data-url=”https://news.google.com/sciences/definitions/physics- virgo-4001/” data-more=”Read more”>Virgowith which they are potentially associated, from a distance of up to 300,000 light years.

The presence almost exclusively of blue stars, therefore young, without any Yellow dwarfs fuse hydrogen into helium in…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/ midioriginal/ 4/d /b/4db5f06b53_50034117_equinoxprom-eit-big-09.jpg” data-url=”https://news.google.com/sciences/definitions/universe-dwarf-yellow-29/” data-more= “Read more”>yellow dwarf o Since their luminosity is very low (about 1% maximum of 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-dwarf-red-31/” data – more=”Read more”>red dwarf actually detectable, indicates that star formation is recent. However, the presence of many metals indicates that the gas from which these stars formed must have been in a large, ancient galaxy that had time to chemically evolve with several generations of stars carrying on. nucleosynthesis stellar and ending its life 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”>supernovae, thus expelling the products of this nucleosynthesis to the galaxies. Therefore, we should see, as in the Milky Way, red dwarfs and yellow in abundance.

To resolve this paradox, two theories can be invoked, all of which involve masses gas ejected from a large galaxy. The first assumes the effect of tidal forces exerted by one large galaxy on another, forces that would therefore have ripped off gas. The other theory involves a galaxy rapidly colliding with a mass of hot plasma in the galaxy cluster. It can be shown that the collision produces a Pressure capable of quickly ripping a mass of gas out of the galaxy. We speak then of an effect called dynamic pressure stripping (ram pressure removal in English).

The researchers are more inclined to the second hypothesis because, to obtain blobs even though they are highly isolated from surrounding galaxies, they must move quickly, which is not compatible with the tidal mechanism hypothesis.

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