New "Map" Could Help Solve Ancient Mysteries of Our Galaxy

By Nancy Atkinson - May 29, 2008 at 9:41 AM UTC | Milky Way
milkyway.jpg

An international team of astronomers from the Sloan Digital Sky Survey unveiled a new detailed map of the chemical composition of more than 2.5 million stars in the Milky Way. This new map could help reveal the unknown ancient history of our galaxy. "With the new SDSS map, astronomers can begin to tackle many unsolved mysteries about the birth and growth of the Milky Way," said Zeljko Ivezic, a University of Washington astronomer, and leader of the study.

Astronomers use the term "metals" to describe all elements heavier than hydrogen and helium, including the oxygen we breathe, the calcium in our bones, and the iron in our blood. Although hydrogen, helium and traces of lithium were created at the beginning of the Universe in the Big Bang, all other elements (such as iron and carbon) were forged in the cores of stars or during the explosive deaths of massive stars.

As a result, stars that formed early in the history of the Galaxy (some 13 billion years ago) were made of gas that had few metals created by the generations of stars that came before. These "metal-poor stars" provide astronomers with a chemical fingerprint of the origin and evolution of the elements. As subsequent generations of stars formed and died, they returned some of their metal-enriched material to the interstellar medium, the birthplace of later generations of stars, including our Sun.

Previous chemical composition maps were based on much smaller samples of stars and didn't go as far as the distances surveyed by SDSS-II -- a region extending from near the Sun to about 30,000 light years away. The construction and first implications of the map are described in a paper titled "The Milky Way Tomography with SDSS: II. Stellar Metallicity," slated to appear in the August 1 issue of The Astrophysical Journal.

"By mapping how the metal content of stars varies throughout the Milky Way, astronomers can decipher star formation and evolution, just as archaeologists reveal ancient history by studying human artifacts,"explained University of Washington graduate student Branimir Sesar, a member of the research team.

Sources:

ArXiv,

Sloan Digital Sky Survey

Nancy Atkinson

Nancy Atkinson

Nancy Atkinson is a space journalist and author with a passion for telling the stories of people involved in space exploration and astronomy. She is currently retired from daily writing, but worked at Universe Today for 20 years as a writer and editor. She also contributed articles to The Planetary Society, Ad Astra (National Space Society), New Scientist and many other online outlets.

Her 2019 book, "Eight Years to the Moon: The History of the Apollo Missions,” shares the untold stories of engineers and scientists who worked behind the scenes to make the Apollo program so successful, despite the daunting odds against it. Her first book “Incredible Stories From Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos” (2016) tells the stories of 37 scientists and engineers that work on several current NASA robotic missions to explore the solar system and beyond.

Nancy is also a NASA/JPL Solar System Ambassador, and through this program, she has the opportunity to share her passion of space and astronomy with children and adults through presentations and programs. Nancy's personal website is nancyatkinson.com