A Mexican identifies the oldest galaxies

Some of the weakest satellite galaxies that orbit the Milky Way are the first ones to have formed in our universe, unearthing the article "The Imprint of Cosmic Reionization on the Brightness Function of Galaxies" (The Trace of Cosmic Reionization in the Brightness Function of galaxies), published by the journal The Astrophysical Journal a study led by the Mexican astrophysicist Carlos Frenk Mora.

"Finding some of the first galaxies formed in our universe in orbit around the Milky Way's backyard is the astronomical equivalent of finding the remains of the first people who inhabited the Earth. "said the university scientist from the United States.

These ancestral galaxies are: Segue-1, Bootes I, Tucana II and Ursa Major I, with more than 13 billion years. "What we did was collect and interpret all data within the schema we have about the evolution of the universe," Frenk Mora said.

Alis Deason, from the Institute of Computational Cosmology at the University of Durham, England, also took part in the research. , and Sownak Bose, from the Harvard-Smithsonian Center for Astrophysics.

"The finding supports the current model for the evolution of our universe, the so-called" cold-dark matter Lambda ", in which the elementary particles that make up the universe dark matter stimulates the cosmic evolution", added the Mexican specialist.

With the help of instruments such as the VTL of the European Southern Observatory, satellite systems that are kept near other larger ones (such as Andromeda) have been studied more thoroughly. or the Milky Way) due to gravity attraction.

Using computational modeling systems, Frenk Mora and his team identified two populations of satellite systems in orbit around our galactic environment.

The first contains galaxies formed during the dark cosmic era. The second, with brighter objects that formed hundreds of millions of years later, once the hydrogen ionized by the intense ultraviolet radiation of the first stars could cool in more massive halos of dark matter.

Surprisingly, the team discovered that a theoretical model of galaxy formation that they had previously developed coincided perfectly with the data, allowing them to derive the formation times of satellite systems.

Ten years ago, the weakest galaxies near the Milky Way they would have been thrown away from the study, but with the new scientific equipment, these have been revealed as "a new treasure to learn from the primitive universe," added the specialist.


It is believed that When the universe was about 400,000 years ago, the first atoms formed. These were hydrogen (the simplest element in the periodic table), they piled up in the clouds, but gradually cooled down to settle in the "halos" of dark matter that originated from the big bang.

This phase is known as "the cosmic dark age", which lasted about 100 million years, eventually the gas that had cooled down in the halo's had started to become unstable, forming stars and thus becoming the first galaxies that gave way to light.

The intense ultraviolet radiation emitted by the first galaxies destroyed the atoms of residual hydrogen to ionize them (destroy their electrons), making it difficult for this gas to cool down and


400,000 years, age of the universe when the first formed formed new stars.

The process of galaxy formation completely ceased for the next billion years or so. atoms

13 billion years ago the galaxies Segue-1, Bootes I, Tucana II and Ursa Major I have


The Mexicaa nse robot team reached the quarterfinals in the FIRST Global Challenge World Championship and won the silver medal in the Albert Einstein Award for the good performance of its robot, named Mu & # 39; a & # 39; an ("power" in maya "), after the three days that the match lasted.

The team consists of high school students and Tec de Monterrey University from the campuses of Mexico City and Chihuahua. A thousand young people aged between 14 and 18 from 182 countries took part in the fair. Frida Sosa, Ángel Berdeja, Herman Sánchez, Santiago Garcia and Jorge Garcia joined the national team. "It's a great pride for us, we have not seen these kind of races in Mexico before, and we felt very happy because we could break that stereotype, and that performance is the beginning of something really big for Mexico," Berdeja said.

Germany, Romania and Singapore have won the jousting game.

Source link

Leave a Reply