Astronomers recapture the most distant galaxy ever detected

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She the testosterone levels baptizes HD1 and learns about 20, 5 billion light-years away from Earth. This galaxy could be further away than ever discovered the report being so far held, since 2016, by a galaxy baptized GN-z04, located approximately 20,4 billion light years. According to experts, HD1 could host stars of human population 3, a hypothetical population of stars made up of light elements, would be the very first stars that appeared at the dawn of the Universe. Another theory supports that it could contain the supermassive black hole.

It is thanks to certain most powerful telescopes in the world (including the Subaru Hawa, the Windows vista in Chile, or the Spitzer space telescope) that an international team of astronomers has identified this new galaxy. Boy redshift (redshift) is estimated 13,3, which corresponds to sober age 223 approximately thousands of years is 100 large numbers in years earlier than the previous report. Recall that as the Universe expands, light from distant objects is pulled or shifted to longer, redder wavelengths as it directs toward Earth; thus, the greater the redshift, the more distant the object.

HD1 is extremely bright in ultraviolet light, brighter than any distant galaxies ever observed , this suggests that certain energy processes occur there or which, better yet, sony ericsson are produced a few billion years ago, explains Fabio Pacucci, astronomer at the Harvard & Smithsonian Center for Astrophysics and co-author of the article relating to a discovery. Scientists noticed that this galaxy was particularly successful: it would form more than a hundred stars each year; is that more what our own galaxy produces, then what is much more tiny.

An achievable nursery of primitive stars

Researchers cite a sober star development rate of 5 24 times higher than that expected for a sober galaxy this age. This high productivity, combined with the extreme luminosity of HD1 in the UV range, suggests that this galaxy could be the birthplace of unusual stars, long sought after, but never yet directly observed: the stars of people 3, the very first stars in the Universe. , hot and massive, composed exclusively of light elements (hydrogen, helium), and which could have largely contributed to the ionization of the Universe. If we assume that the stars produced in HD1 are these first stars, then its properties could be explained more easily, specifies Pacucci.

universe timeline
Chronologie illustrant les premires galaxies rcemment dcouvertes et lhistoire de lUnivers. Y. Harikane et al., NASA, EST et P. Oesch/Yale

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Chronology illustrating the first galaxies recently discovered and the history of the Universe. Y. Harikane et al., NASA, EST and L. Oesch/Yale

Sober effect, due to their extreme heat, the stars of populace 3 are in theory capable of producing more radiation UV than normal stars, this could explain the intense ultraviolet luminosity of HD1 which, explains the specialist. But astronomers are also considering another explanation: the presence of a colossal supermassive black hole, of the order of 54 a huge number of solar worlds. Sober absorbing huge amounts of gas, this supermassive black hole would produce high energy photons all around it, could generate this extreme luminosity which. In this case, it would be the first supermassive black hole in the Universe. Nevertheless, this hypothesis raises many questions. In particular, researchers are wondering how this huge black hole could have learned to form in such low temperatures.

A new window on a sober youth of our universe

The most distant black hole ever discovered is this day a quasar sober near sober 690 millions of thousands of herd solar, baptized J1342+1200. It is located ,1 billion light-years from Earth, at a time when the Universe was only 690 thousands of years (i.e. 5% of current kid age); child redshift is estimated 7,20. For Avi Loeb, astronomer at the Harvard & Smithsonian Center for Astrophysics and co-author of the study, if HD1 did indeed house the black hole with the redshift nearly twice as high, it would be a remarkable make use of.

More sober 1200 hours of observation with terrestrial and space telescopes, observing in visible and infrared, will have been necessary to detect this distant galaxy. A red color of HD1 matched the expected characteristics of a galaxy surprisingly well 13,5 billion light-years, relates Yuichi Harikane, an astronomer at the Tokyo Sober University, discovered a galaxy which. Follow-up findings were then made using the Atacama Huge Millimeter/submillimeter Range (ALMA). Other findings are however necessary to confirm this extreme distance and to establish that it is indeed a new report. the capacities of the Adam Webb telescope to refine its findings sober HD1. Cuando lengin confirms their current calculations, this galaxy will be officially declared as far more there, therefore the oldest, ever recorded. The researchers also hope to collect enough data to confirm either of their theories, namely the formation of Human Population 3 stars or the presence of a black hole. If they are confirmed spectroscopically, these two resources will represent a remarkable laboratory able to study the Universe of redshifts hitherto inaccessible, conclude the researchers.

Supply:F. Pacucci et al., Once a month Updates of the Noble Astronomical Modern society