Multiple Channels for Nitrogen Pollution by Metal-enriched Supermassive Stars and Implications for GN-z11

Multiple Channels for Nitrogen Pollution by Metal-enriched Supermassive Stars and Implications for GN-z11

Blog Article

GN-z11 is an unusually luminous high-redshift galaxy that was recently observed to have strong nitrogen lines while at the same Metal Skewers time lacking traditional signatures of active galactic nucleus activity.These observations have been interpreted as a supersolar nitrogen abundance, which is challenging to explain with standard stellar evolution and supernova enrichment.We present simulations of four models of metal-enriched supermassive stars after the zero age main sequence, which Cayenne produce supersolar nitrogen consistent with the observations of GN-z11.We then show that the most-massive model ends its life in a violent explosion that results in even greater nitrogen pollution.