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Astronomers discover less metallic star system in the Milky Way

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Astronomers discover less metallic star system in the Milky Way

The structure found in the Milky Way has a lower proportion of heavy elements than any other. star system known in our galaxy… Discovery described in a scientific article published this Wednesday (5) in the journal Naturewas made through the Gemini Observatory, a program of the US National Optical Infrared Astronomy Research Laboratory (NOIRLab).

According to observations, the stars in this stream were detached from the ancient star cluster and are relics of the early days of the Milky Way, which may provide data on the formation of the first stars.

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An international team of researchers, including members of the European Union, Canada and Russia, is responsible for the discovery of C-19, the so-called stellar stream south of the Milky Way. Its orbit extends about 20,000 light years from the galactic center at its closest point and about 90,000 light years from the farthest point.

This stellar stream, known as C-19, covers a large area of ​​the night sky, about 30 times the width of the full moon.

The star system covers an area equivalent to 30 full moons in the Milky Way.

According to scientists, the star system occupies an impressive area in the night sky – about 30 times the width. Key – although not visible to the naked eye.

Using the Gemini North Telescope in Hawaii and the Gemini Remote Access to CFHT SPADES Spectrograph (GRACES) instrument, both from the Gemini Observatory, the team realized that C-19 was the remnant of a globular cluster.

Globular clusters were previously thought to contain at least 0.2% metal, but C-19 has an unprecedented level of less than 0.05% metallicity.

The discovery that a weak metallic flux arises from a globular cluster has implications for star formation. clusters stars and galaxies in the early universe.

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The animation shows how a globular star cluster orbiting a galaxy still forming the Milky Way could have been torn apart by the gravity of an evolving galaxy and become C-19 stellar stream.

In fact, the very existence of this stream indicates that globular clusters and the first building blocks of the Milky Way must have formed in a low-metal environment before successive generations of stars supplied the universe with heavier elements.

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“It is not known if globular clusters exist with so few heavy elements. Some theories even suggested that they could not have formed, ”commented Nicholas Martin of the Astronomical Observatory in Strasbourg, the main author of the study. “Other theories suggest that they all disappeared long ago, making this a fundamental discovery for our understanding of how stars formed in the early universe.”

The team members originally detected C-19 in data from the Gaia satellite using an algorithm they developed specifically to detect stellar streams. The stars in C-19 were also identified by the Pristine Survey – a search for the least metallic stars in and around the Milky Way with the Canada-France-Hawaii telescope – as interesting enough to warrant follow-up observations.

The distribution of very dense groups of stars in the Milky Way, called globular clusters, is superimposed on a galaxy map compiled from data from the Gaia satellite. Each point represents a cluster of several thousand to several million stars. The color of the dots shows their metallicity, that is, the content of heavy elements in them relative to the Sun. The C-19 stars are marked with blue symbols. Credit: N. Martin / Astronomical Observatory of Strasbourg / CNRS; Telescope Canada-France-Hawaii / Coelum; ESA / Gaia / DPAC

To determine the origin of the stars that make up C-19, astronomers needed detailed GRACES spectra. The team also collected data using a spectrograph installed at the Gran Telescopio Canarias in La Palma, Canary Islands.

“GRACES provided important clues to the fact that C-19 is a discontinuous globular cluster rather than a more ordinary interrupted dwarf galaxy,” explained Kim Venn of the University of Victoria, principal investigator of the GRACES observations. “We already knew that this was a very low metal stream, but identifying it as a globular cluster required the precision of metallicity and detailed chemistry available only with high resolution spectra.”

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The new study also suggests that C-19 must have formed from very early generations of stars, making the cluster a remarkable relic from when the first star clusters formed.

Consequently, this discovery improves our understanding of the formation of stars and star clusters that emerged shortly after the Big Bang, and provides a natural laboratory for studying the oldest structures in galaxies.

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Xiaomi POCO F4 GT disappoints in its gaming performance tests (video)

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Xiaomi POCO F4 GT disappoints in its gaming performance tests (video)

Xiaomi POCO F4 GT is one of the cheapest smartphones on the market with a Snapdragon 8 Gen 1 processor. This is the Chinese company’s best offering for the gaming segment, but its performance leaves much to be desired.

This unfortunate scenario was once again confirmed in the latest POCO F4 GT test conducted by the Golden Reviewer Youtube channel. Compared to its peers, this Chinese smartphone could not keep up with the competition.

Xiaomi POCO F4 GT doesn’t want fps in Apex Legends Mobile

The newly released game Apex Legends Mobile was chosen to test the gaming performance of POCO F4 GT. Unfortunately for fans of the brand, the results put him at the end of the table.

On average, Xiaomi POCO F4 GT is presented only 47.5 fps during the gaming session, which you can see in the video above. Clearly poor performance for a smartphone with a strong focus on this market niche.

The performance limitations of the POCO F4 GT start to be noticed already in the third minute of the test. Then we started seeing performance drops for no apparent reason.

From the tenth minute of the test until its end, we see a constant performance in the region of 40 frames per second. Although the POCO F4 GT reached a peak speed of 60fps, it was unable to maintain those numbers throughout the test.

In first place in the table built by the Golden Reviewer channel, we have the Redmi K50 Pro with an average of 59.6 fps. This is an exclusive smartphone for the Chinese market, equipped with a Dimensity 9000 processor.

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For European consumers, we have the iPhone 13 Pro Max showing the best performance in this test with an average of 59.1 fps. For Android lovers, the Samsung Galaxy S22 Ultra came out on top with an average of 57.4 fps.

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Instagram is testing artificial intelligence to check the age of users

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Instagram is testing artificial intelligence to check the age of users

Instagram is testing new ways to verify the age of its users, including an AI face identification tool to make sure people are 18 or older.

There are no tools yet to prevent children from accessing the Meta platform.

The use of artificial intelligence to identify faces, especially in teenagers, has raised some concerns given the Meta’s complicated history. when it comes to protecting user privacy.

Meta stressed that the technology used to check the age of people can’t find out your identity – only your age. After completion of Meta validation in partnership with startup Yoti delete face video.

The owner of Facebook and Instagram said that from today, if anyone tries to change their date of birth on the platform for posting videos and photos of people under or over 18, you will need to verify your age using one of these methods.

Meta continues to face questions about the negative impact its products, especially Instagram, have on some teens.

Technically, children must be at least 13 years old to join Instagram, similar to other social networks. But some solve this problem by lying about their age or by having their parents do it.

To use the face scan feature, the user has to send a “selfie” videosent to Yoti, a London-based startup that uses people’s facial features to estimate their age.

Yoti is one of several biometric companies that are capitalizing on the UK and European push for more reliable age verification technology. to prevent children from accessing pornography, dating apps, and other adult content.

“While Instagram is likely making good on its promise to remove images of candidates’ faces and not attempting to use them for individual facial recognition, the normalization of facial scans raises other social concerns,” a professor at Cambridge University Essex School of Law warned. (United Kingdom) Darag Murray.

In 2021, Meta announced that it was shutting down Facebook’s facial recognition system and removing the fingerprints of more than a billion people after years of scrutiny by courts and regulators.

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FEUP researcher will maintain a reference journal on engineering and applied sciences

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FEUP researcher will maintain a reference journal on engineering and applied sciences

José Antonio Correia has been in the top 2% most cited scientists in the world since 2019 according to the Stanford University rankings. Photo: DR

Jose Antonio Correiaresearcher Institute for Research and Development in Structural and Construction (CONSTRUCT) as well as University of Porto Faculty of Engineering (FEUP) It’s from Institute of Science and Innovation in Mechanical Engineering and Industrial Construction (INEGI)recently appointed co-editor of the civil engineering department Alexandria Engineering Journal (Elsevier), the leading journal in engineering and applied sciences.

“I am honored to be part of a journal in which distinguished world-class professors and researchers participate as members of the editorial board, and at the same time to be recognized for my contributions to the fields of materials and engineering structures. I also express my gratitude to the institutions in which I work for the support and availability of the necessary funds for the development of my research activities and cooperation with the industry,” says the researcher.

Bye co-editorf, José Antonio Correia will have primary responsibility for managing submissions from the civil engineering academic community, putting them into the review and final decision process.

Scientific research and recognition

Since 2019, José Antonio Correia has been ranked among the top 2% most cited scientists in the world by Stanford University, having recently won the award. 2021 IGF Manson-Coffin Medal. He was also considered one of the most influential academics in the world during the period 2015-2021 in several scientific areas of fatigue such as SN curves, fatigue models applied to materials and structural parts, accumulated damage, metal bridges and structures. connections.

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Most recently, the EFUP researcher was appointed co-chair of the European Structural Integrity Society (ESIS) TC3 Technical Committee – Fatigue of Engineering Materials and Structures, a body on which he already served as Chairman of the TC12 Technical Committee – Safety and Risk Analysis of Large Structures and Structural Parts. In addition, he acted as an evaluator of European project proposals.

José Antonio Correia has also accumulated extensive experience in positions related to scientific publications in the field of engineering structures. Member of the editorial board of the journal International Journal of Fatigue (worldwide reference journal in the field of fatigue of engineering materials and structures) since January last year, is also the current Journal co-editor Smart infrastructure and constructionShe is working on this role with Noha Saleb, a professor at Middlesex University in London, United Kingdom.

In addition, he is the founder and current co-editor of Structural Integrity – Series (Springer), together with Abilio De Jesus, Professor of the Department of Mechanical Engineering of the FEUP, Editor-in-Chief of the Journal Department MDPI simulationmagazine editor Open study materials (F1000-Taylor & Francis), e Make editor-in-chief International Journal of Structural Integrity (Emerald).

Most recently, José Correia became a member of the editorial board Philosophical works A – Engineering sciences (Royal Society) e Technical failure analysis (Elsevier).

With a research activity “divided” between CONSTRUCT and INEGI, José Antonio Correia also teaches at the Faculty of Science and Technology of the University of Coimbra, at the University of Tras os Montes e Alto Douro (UTAD), as well as at the Department of Constructions of the Faculty of Civil Engineering and Geosciences Delft University of Technology (Netherlands).

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At FEUP, he is also co-coordinator, along with Professor Rui Calzada, of the Hyperloop-Verne project recently approved by the MIT Portugal program. The researcher has been co-coordinator of several research and university projects in the field of structural integrity, fatigue and failure of materials, engineering details and structures.

He also holds several honorary positions at the invitation of university institutions around the world such as Xi’an Jiaotong University (China), where he is an Associate Professor, or NIT Silchar (India) and Universidade Estadual Paulista (UNESP, Brazil), where he is an Invited professor.

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