The secrets of the evolution of the Milky Way can be hidden in globular clusters

The secrets of the evolution of the Milky Way can be hidden in globular clusters

Brazilian astronomer Denillo Camargo recently found 5 new globular clusters in the convexity of the Milky Way, which can provide important information about the formation and evolution of the innermost regions of our galaxy. New clusters were ancient and poor in metals.

Globular clusters are spheroidal collections of densely coupled stars orbiting galaxies. Scientists see them as natural laboratories because they are used to study the evolution of stars and chemicals. These are relatively rare objects, because a little more than 200 globular clusters have so far been found in the Milky Way. Therefore, even 5 newcomers are considered a significant discovery.

Researchers have not yet figured out the process of the formation and development of the Milky Way galaxy, so new globular clusters in galactic convexity can be useful for obtaining valuable information. New clusters (Camargo 1102-1106) were found using photo analysis from NASA's WISE mission. The spherical nature of the clusters was confirmed by photometric data from the 2MASS and Gaia satellite (second data release). Any discovery of a globular cluster is an important astronomical event. In addition, we are talking about the first star systems formed in the early Universe. They can be perceived as living fossils, which became the basis for galaxies, such as the Milky Way. New globular clusters provide ages and metals that are consistent with other clusters in the halo, hinting at the expansion of the central region of the Milky Way.

The age of new globular clusters is 12.5–13.5 billion years, and the metallicity level is from –1.5 to –1.8 dex. Camargo 1102 is located above the galactic bar at a distance of 27,000 light years from Earth and 2800 light years from the center of the galaxy. The other four clusters are 14700-18900 light-years distant from us and 16700 light-years from the center. Their parameters indicate that globular clusters appeared before the Universe was enriched with supernova metals (SNe).

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