Recent research realized by the astronomers from the Special Astrophysical Observatory (SAG) in Russia focused on photometric measurements of dwarf galaxies captured by the ALFALFA survey. The team’s findings are fantastic and revolutionary!
Astronomers succeeded in determining the precise distances of 18 dwarf galaxies. The study of such type of galaxy is challenging, especially given that the dwarfs’ evolution happens without any extra influence.
The research promises to improve the astronomers’ understanding of star development processes in galaxies. Here is what you need to know.
It’s a Dwarf Matter
Astronomers discovered new dwarf galaxies utilizing radio observations in the neighboring galaxy accumulations. They needed more precise distance measurements to obtain more data into the galaxies’ nature. So, they used an innovative technique known as TRGB, based on measuring the head of the red giant branch stars.
Using that method, SAO’s astronomers Nikolay A. Tikhonov, Olga Galazutdinova, and their colleagues succeeded in determining the distance of 18 dwarf galaxies.
Furthermore, the dwarf galaxies were captured by the ALFALFA (the Arecibo Legacy Fast ALFA) survey. The pictures, however, were taken by NASA’s Hubble Space Telescope.
Dwarf Galaxies Features and Other Significant Details
Dwarf galaxies, mainly those comprising hydrogen and situated far from neighboring galaxies, are among the most intriguing and challenging targets for observation.
Using the Hubble’s data, the astronomers developed the CM (color-magnitude) diagrams on which red giants and young stars can be spotted. For every galaxy, the team found out the TRGB jump’s accurate position and the RGB color index.
Such a development brought essential information, including the distances to the galaxies and red giants’ metallicity.
According to the research, the dwarf galaxies are between 16.6 and 39.1 million light-years away from our planet. Two of them, dubbed AGC 198507 and AGC 739005, are binary galaxies, while six are classified as low-metallicity galaxies.
More details about those intriguing galaxies will be soon released!
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