a galaxy seen only 300 million years after the Big Bang?

We all look forward to the start of data collection in the summer of 2022 that will lead to discoveries by the telescope. james webb. But meanwhile the astrophysicists continue to push the limits of the instruments at their disposal to reach even further into the past of the observable cosmos, in search of the first galaxies and the first Où se trouvent les trous noirs supermassifs ?
Ils sont tapis au cœur de la majorité des grandes…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/f/9/5/f959b423ee_50149009_trou-noir-m87-2-event-horizon-telescope-collaboration.jpg” data-url=”https://news.google.com/sciences/definitions/astronomie-trou-noir-supermassif-12722/” data-more=”Lire la suite”>supermassive black holes
. We can convince ourselves of this with two publications today, one in astrophysical journal and the other in Monthly notices of the letters of the Royal Astronomical Society.

Astrophysicists report the discovery of a Voici une liste d’objets célestes pouvant être dénommé astre (non…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/6/c/c/6cc6562b02_127395_astre-c-esa-hubble-nasa.jpg” data-url=”https://news.google.com/sciences/definitions/etoile-astre-851/” data-more=”Lire la suite”>star called HD1, which is the farthest ever discovered to date, as it has a log value z, the quantity introduced by cosmologists to speak of a spectral redshift with the Hubble-Lemaître law linking this shift to a distance. It is also the oldest object detected since according to the equations from Elle apporte cependant de plus une nouvelle conception de l’espace et du temps, dans laquelle la gravitation devient une propriété géométrique de…” data-url=”https://news.google.com/sciences/definitions/physique-relativite-generale-3572/” data-more=”Lire la suite”>general relativity and the standard cosmological model strongly supported by, among other things, data from the Satellite Planck on cosmic radiation (and despite the tension between these data and those of the Extrait du…” 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/univers-supernova-60/” data-more=”Lire la suite”>supernovae for the estimation of theacceleration of the expansion of the universe observable), HD1 would be seen as it was about 13.5 billion years ago, that is, only about 300 million years after the big Bang.

A quasar?

As explained in a press release from Astrophysics Center | Harvard and Smithsonians in the United States, HD1 was discovered after more than 1,200 hours of observation with the Japanese Subaru Telescope on the ground in Hawaii and the telescope View (English acronym Visible and Infrared Survey Telescope for Astronomy) of the’THATand in space the deceased spitzer space telescope.

« It was very difficult to find HD1 among more than 700,000 objects », explains in this press release Yuichi Harikane, astronomer at the University of Tokyo who discovered the galaxy. The researcher adds: The Quelquefois, la couleur…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/9/5/7951943cc1_85596_couleur.jpg” data-url=”https://news.google.com/sciences/definitions/physique-couleur-4126/” data-more=”Lire la suite”>colour HD1’s red color matched surprisingly well the expected features of a galaxy of 13.5 billionLight yearswhich gave me a little goosebumps when I found it. The astrophysicists then made observations using theAtacama Large Millimeter/submillimeter Array (Alma) to confirm the distance of HD1, which is about 100 million light years farther than GN-z11, the current confirmed record holder for the farthest galaxy.

Two things about HD1 remain to be established more firmly. First of all, its distance, and it is planned to do so by observing it with the James-Webb. But also its exact nature because astrophysicists still do not know very well if they are observing an ordinary galaxy or a quasar with a supermassive black hole that would already contain about 100 million masses solar cells, which would be spectacular for a galaxy observed so soon after the Big Bang. The supermassive black hole of our Depuis la Terre, on ne peut observer qu’une coupe transversale…” 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/univers-voie-lactee-3729/” data-more=”Lire la suite”>Milky Way currently only contains 4 million, but it is true that in the case of M87* that’s just over 6 billion solar masses.

Or population III stars?

In fact, to speak of an ordinary galaxy is not correct, and astrophysicists are even considering one more exotic than the observation of the most distant quasar discovered to date. In fact, HD1 is very bright in the field ofultravioletthe researchers had first hypothesized that they were observing a galaxy with an outbreak ofstars (star galaxy in English) like the ones we already know. But the estimate of the rate of star formation needed to explain the brightness from HD1 implies that the galaxy would form more than 100 new stars each year, which is 10 times more than what is theoretically expected from starburst galaxies based on those observed.

However, as explained by the astrophysicist Fabio Pacucci parked in Astrophysics Center | Harvard and Smithsonianslead author of the study published in Mnras and co-author of the article in ApJ: “ The first population of stars to form in the universe was more massive, brighter, and hotter than modern stars. If we assume that the stars produced in HD1 are these first stars, let’s say from Population III, then its properties could be more easily explained. In fact, the stars of population III they are capable of producing more ultraviolet light than normal stars, which could explain HD1’s extreme ultraviolet luminosity. »

This is one more reason to look forward to the James-Webb observations.

Telescopes atop Mauna Kea, like here, including the Keck Observatory telescopes shown in this video, allow us to plumb the secrets of the cosmos. For a fairly accurate French translation, click on the white rectangle at the bottom right. Then the English subtitles should appear. Then click on the nut to the right of the rectangle, then on “Subtitles” and finally on “Auto translate”. Choose “French”. © Explore documentary films

Record: a galaxy 380 million years after the Big Bang?

article of Laurent Sacco published on 12/14/2012

A group of astronomers has discovered 7 of the most distant galaxies known, observed during a period that extends between 350 and 600 million years after the Big Bang. One of them might even have a record. Hubble shows it maybe when the cosmos was only 380 million years old.

Astronomers have been studying the Hubble Ultra Deep Field (HUDF). From 2003 to 2004, Hubble’s instruments observed for several hours, spread over a duration of 11 days in total, a small region of the celestial vault located in the constellation of the Furnace. The astrophysicists had thus obtained an image in the visible in which there was as much galaxies closest and oldest known at the time. In 2009, the arrival of the Wide Field Camera 3 (WFC3) aboard Hubble had allowed observations to be made in the infrared, revealing galaxies that are even older and more difficult to observe due to their low luminosity and higher redshift.

A group of astronomers has just published an article on archive covering observations by the HUDF in the near infrared over 6 weeks, from August to September 2012.

The Du Big Bang au Vivant site is a French-speaking multi-platform project on the cosmology contemporary. Hubert Reeves, Jean-Pierre Luminet and other researchers there answer questions using video. © ECP Group, dubigbangauvivant.comYoutube

the balance ofHubble Ultra Deep Field 2012 has arrived

The harvest turned out to be good as the researchers obtained more precise measurements and more Cristaux et solides amorphes
À l’échelle…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/6/8/e6888a7dfb_82227_solide.jpg” data-url=”https://news.google.com/sciences/definitions/chimie-solide-15332/” data-more=”Lire la suite”>solid
relative to galaxies observed when the age of the observable universe was no more than 600 million years. With the observable cosmos estimated to be 13.7 billion years old, new Hubble images reveal 7 galaxies as our space and the Matière organique, matière azotée, etc.
Il existe différentes familles comme :

la matière organique, qui constitue les êtres vivants (animaux ou végétaux) ou…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/7/0/e70ccaaf4a_91935_matiere.jpg” data-url=”https://news.google.com/sciences/definitions/matiere-matiere-15841/” data-more=”Lire la suite”>matter contains were only 4% of their current age, in the words of the researchers.

Observations still consistent with the Big Bang

These 7 galaxies would have ages between 350 and 600 million years after the birth of the observable universe, so at the time when the first stars and galaxies reionized the universe, according to information recently deduced from the cosmic radiation. One of these galaxies is particularly interesting and is not unknown. Is about UDFj-39546284.

Almost two years ago it was already the farthest known galaxy, but the estimation of its age, and therefore its distance, was still uncertain. Another galaxy had been proposed for the title of oldest and most distant observed: SXDF-NB1006-2.

UDFj-39546284 could be observed when only 380 million years have passed since theepisode fossil radiation. If that’s the case, it’s further than we first thought, and even holds the distance record. Technically, its redshift, z, was initially thought to be around 10, when it appears to be 11.9.

The 2012 observation campaign of the Hubble Ultra Deep Field he has not only pushed the limits of the observable universe in the infrared even further with Hubble. The images and measurements obtained also show a very young cosmos in formation, as it had not been for billions of years, and in total agreement with the theory of big Bang. They give us an idea of ​​what the telescope should reveal to us james webb in a few years, in much more detail.

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