Scientists surprisingly detect key life ingredient at our galaxy’s edges
One of the building blocks of life has been discovered at the least expected place of our Milky Way Galaxy.
Two radio telescopes detected phosphorous on the fringes of the Milky Way galaxy. It plays a key role in the creation of DNA and RNA in living organisms.
The observations led by the University of Arizona call into question current hypotheses concerning the formation of elements in the Milky Way’s furthest reaches.
Study of a molecular cloud
For this study, the team performed observations using the 12-meter radio telescope at the Arizona Radio Observatory on Kitt Peak and a 30-meter radio telescope maintained by the Institute for Radio Astronomy in the Millimeter Range (IRAM) near Granada, Spain.
The data revealed the existence of phosphorus in WB89-621, a molecular cloud located around 74,000 light-years from the center of the Milky Way.
The presence of phosphorus monoxide and phosphorus nitride was discovered in the region by the telescopes.
“The discovery extends the presence of phosphorus almost twice as far out as where it was known to exist,” mentioned the release.
Massive stars typically don’t form in the outer galaxy
In addition to phosphorus, essential elements for life include hydrogen, oxygen, nitrogen, and sulfur.
Elements including carbon, oxygen, and nitrogen are known to form in lower-mass stars, which are predicted to be more prevalent near our galaxy’s outskirts.
As these lower-mass stars approach the end of their life cycles, they release these elements into space.
“But to make phosphorus, you need some kind of violent event. It is thought that phosphorus is created in supernova explosions, and for that, you need a star that has at least 20 times the mass of the sun,” said Lucy Ziurys, Regents Professor of Chemistry and Biochemistry and Astronomy and astronomer at Steward Observatory, in an official release.
Massive star formation is not expected at the outer edges of the Milky Way due to the decreased density of matter as one moves away from the galaxy’s core. As a result, these stars are unable to acquire enough mass to end their lives in supernovae.
Therefore, the new research suggests that phosphorus dispersion is not only dependent on supernova explosions.
How does phosphorus form in the outer regions?
This study’s scientists attempted to understand how this important element got to the galaxy’s outskirts.
Scientists put forth one potential explanation that “low and intermediate-mass stars may generate excess neutrons by stripping them off of carbon atoms during the end of their life cycle.”
These neutrons might then congregate in pockets between the stars’ hydrogen- and helium-burning shells. Following the addition of these neutrons to silicon atoms, phosphorus could be formed.
This process suggests an alternative pathway for the production of phosphorus in stars beyond the conventional understanding tied to massive star supernovae.
Source: Interesting Engineering
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Scientists surprisingly detect key life ingredient at our galaxy’s edges