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 by Staff Writers Copenhagen, Denmark (SPX) Dec 18, 2019
Researchers have discovered gigantic clouds of gaseous carbon spanning more than a radius of 30,000 light-years around young galaxies using the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile. This is the first confirmation that carbon atoms produced inside of stars in the early Universe have spread beyond galaxies. No theoretical studies have predicted such huge carbon cocoons around growing galaxies, which raises questions about our current understanding of cosmic evolution. The result was obtained by Seiji Fujimoto and his colleagues, rather unconventionally, by examining data from former observations. He is currently employed at The Cosmic Dawn Center at the Niels Bohr Institute, University of Copenhagen. The study is now published in Astrophysical Journal.
Combinations of archival data achieved unprecedented sensitivity student at the University of Tokyo. "By combining all the data, we achieved unprecedented sensitivity. To obtain a dataset of the same quality with one observation would take 20 times longer than typical ALMA observations, which is almost impossible to achieve."
The discovery suggests rewriting parts of the evolution of the universe Astronomers have found heavy elements inside baby galaxies, but not beyond those galaxies, due to the limited sensitivity of their telescopes. This research team summed the faint signals stored in the data archive and pushed the limits. "The gaseous carbon clouds are almost five times larger than the distribution of stars in the galaxies, as observed with the Hubble Space Telescope," explains Masami Ouchi, a professor at the University of Tokyo and the National Astronomical Observatory of Japan. "We spotted diffuse but huge clouds floating in the coal-black Universe."
Then, how were the carbon cocoons formed? "Energetic jets and radiation from supermassive black holes in the centers of the galaxies could also help transport carbon outside of the galaxies and finally to throughout the Universe. We are witnessing this ongoing diffusion process, the earliest environmental pollution in the Universe."
New physical processes must be incorporated into existing models "Young galaxies seem to eject an amount of carbon-rich gas far exceeding our expectation," says Andrea Ferrara, a professor at Scuola Normale Superiore di Pisa. Seiji Fujimoto adds that carbon is not the only element dispersed in the cocoon. Other elements such as Oxygen and Nitrogen could be detected as well, but the signals were fainter. This, however, indicates that other elements could be undergoing the same process as carbon. This is one of many points for further research, suggested by the study. The team is now using ALMA and other telescopes around the world to further explore the implications of the discovery for galactic outflows and carbon-rich halos around galaxies.
Carbon cocoons surround growing galaxies Tokyo, Japan (SPX) Dec 17, 2019 Researchers have discovered gigantic clouds of gaseous carbon spanning more than a radius of 30,000 light-years around young galaxies using the Atacama Large Millimeter/submillimeter Array (ALMA). This is the first confirmation that carbon atoms produced inside of stars in the early universe have spread beyond galaxies. No theoretical studies have predicted such huge carbon cocoons around growing galaxies, which raises questions about our current understanding of cosmic evolution. "We examin ... read more
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