Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.’s Open University. Follow him on Twitter @sciencef1rst.
in observations from the Sloan Digital Sky Survey in 2009. Green peas are so named because they stand out as small, round, unresolved dots with a distinctly green shade. They appear green because a large fraction of light from these rare galaxies originates from bright, glowing gas clouds that emit light at specific wavelengths, rather than the broad spectrum of light and continuous colors emitted byThese green pea galaxies are rare, accounting for just 0.1% of nearby galaxies.
"Peas may be small, but their star-formation activity is unusually intense for their size, so they produce bright ultraviolet light," Keunho Kim, a postdoctoral researcher at the University of Cincinnati and a member of the analysis team, said in the statement."Thanks to ultraviolet images of green peas from Hubble and ground-based research on early star-forming galaxies, it's clear that they both share this property.
The gravitational lensing effect of SMACS 0723 magnified the most distant of these galaxies by a factor of 10, giving the space telescope a massive natural observing boost. Using its Near-Infrared Spectrograph instrument, the JWST also obtained the spectra of the galaxies in the image, which revealed the telltale signs of oxygen, hydrogen and neon emissions, further strengthening the resemblance to green pea galaxies. These spectrographic data allowed the team to measure the amount of oxygen in these distant and early galaxies for the first time, revealing that two of these galaxies have around 20% the oxygen as the Milky Way contains.
As stars die, they enrich the universe with heavy elements that they forged during their lifetimes, meaning early galaxies like these should be relatively deficient in elements heavier than hydrogen and helium, which astronomers refer to as"metals," compared with older galaxies like our own.
Brasil Últimas Notícias, Brasil Manchetes
Similar News:Você também pode ler notícias semelhantes a esta que coletamos de outras fontes de notícias.
Rare rhinos dodge poachers in world's top reserve for first time since 1977No rhinos were poached last year in the world's largest reserve for the endangered great one-horned rhinoceros, India's Assam state, in what authorities said was the first time since 1977.
Consulte Mais informação »
Rare, green comet to pass by Earth starting this weekA rare green comet is expected to pass by Earth this week and will be visible in the night sky for nearly a month, according to NASA and astronomers.
Consulte Mais informação »
Rare, green comet to pass by Earth for the first time in 50,000 yearsA rare green comet is expected to pass by Earth this week and will be visible in the night sky for nearly a month, according to NASA.
Consulte Mais informação »
Rare, green comet to pass by Earth for the first time in 50,000 yearsComet C/2022 E3 (ZTF) will make its closest pass of Earth between Feb. 1 and Feb. 2.
Consulte Mais informação »
Rare, green comet to pass by Earth for the first time in 50,000 yearsComet C/2022 E3 (ZTF) will make its closest pass of Earth between Feb. 1 and Feb. 2.
Consulte Mais informação »
Rare, green comet to pass by Earth for the first time in 50,000 yearsComet C/2022 E3 (ZTF) will make its closest pass of Earth between Feb. 1 and Feb. 2.
Consulte Mais informação »