All articles tagged with #molecular clouds
Researchers have identified approximately 30 prebiotic molecules in space, including all five nucleobases and 14 amino acids found in asteroid samples. While DNA and RNA remain undetected, upcoming missions aim to search for larger, complex molecules in interstellar clouds and on rocky bodies.
Astronomers have detected erythrulose, a four-carbon sugar, in a giant interstellar gas cloud near the Milky Way’s center, suggesting sugars are more common in space than previously thought and could seed prebiotic chemistry by enabling ribonucleotide formation, challenging the idea that sugars form only through gradual, carbon-by-carbon buildup.
Scientists detected heavy water in a planet-forming disk around the young star V883 Orionis, providing evidence that this water predates the star itself and originated in the cold molecular cloud that formed the star, offering insights into the journey of water in planetary systems.
Astronomers have discovered an infant protostar leaving its birthplace, providing new observational evidence for escaping stars. Using high-resolution molecular spectral lines, the researchers found a protostellar core with a noticeable velocity shift in the star-forming region G352.63-1.07. The core's spectral velocity indicates a significant blue shift relative to its parental cloud, suggesting that the escape occurred less than 4,000 years ago. This discovery sheds light on the initial state and mechanisms of escaping stars in galactic evolution.
Scientists have made significant advances in the formation theory of supermassive black holes by using high-resolution simulations of galaxy mergers. They found that the growth of black holes primarily occurs through the accretion of molecular clouds during galaxy mergers. The dynamics of gravitational forces allow massive molecular clouds to efficiently fall into the galactic center, rapidly increasing the formation rate of stars and providing the necessary nutrients for the rapid growth of the black hole. This research provides a deeper understanding of galaxy evolution and offers a possible mechanism for the rapid growth of black holes.
Researchers have discovered the formation of the methyl cation, a key molecule in astrochemistry, through photochemistry in a protoplanetary disk. The discovery was made using the Atacama Large Millimeter/submillimeter Array (ALMA) and the IRAM 30-meter telescope. The findings shed light on the chemical processes that occur in molecular clouds and protoplanetary disks, which are crucial for the formation of planets and other celestial bodies.
Astronomers have detected an echo of X-ray emissions from the Milky Way's central supermassive black hole, Sagittarius A*, that occurred 200 years ago. The black hole had a brief period of activity and consumed nearby material, resulting in X-ray emissions that were more than a million times greater than usual. The emissions were detected by NASA's Imaging X-ray Polarimetry Explorer (IXPE) and were found to be the source of the brightening of nearby molecular clouds. The discovery could help astronomers better understand the behavior of Sagittarius A* and the causes of its flares.