{"id":15897,"date":"2021-12-31T14:00:09","date_gmt":"2021-12-31T14:00:09","guid":{"rendered":"https:\/\/www.innovationnewsnetwork.com\/?p=15897"},"modified":"2024-09-04T21:06:46","modified_gmt":"2024-09-04T20:06:46","slug":"astronomers-create-new-method-understand-galaxy-evolution","status":"publish","type":"post","link":"https:\/\/www.innovationnewsnetwork.com\/astronomers-create-new-method-understand-galaxy-evolution\/15897\/","title":{"rendered":"Astronomers create new method to understand galaxy evolution"},"content":{"rendered":"

Astronomers at The University of Toledo established the star formation history of a post-starburst galaxy using its cluster population to understand galaxy evolution.<\/h2>\n

The University of Toledo<\/a> employed a husband-and-wife team of astronomers to join forces for the first time in their scientific careers during the pandemic to develop a new method to transform the way we understand the history of galaxy evolution.<\/p>\n

Up until now, forging parallel but separate careers while juggling home life and carpooling to cross country meets, Dr Rupali Chandar, professor of astronomy, and Dr J.D. Smith, director of the UToledo Ritter Astrophysical Research Centre and professor of astronomy, merged their areas of astronomical expertise.<\/p>\n

Working alongside UToledo alumnus Dr Adam Smercina who is currently a postdoctoral researcher at the University of Washington, they used NASA\u2019s Hubble Space Telescope to focus on a post-starburst galaxy nearly 500 million light years away called S12. Chandar and Smith are also two of four UToledo astronomers leading some of the first research projects on NASA\u2019s new James Webb Space Telescope scheduled to launch in December.<\/p>\n

Using post-starburst galaxies vs spiral galaxies to understand galaxy evolution.<\/h3>\n

Smercina, who brought Smith and Chandar together on this research, worked with Smith as an undergraduate student starting in 2012, with a focus on the dust and gas in post-starburst galaxies. While spiral galaxies, such as our Milky Way, have continued to form stars at a steady rate, post-starburst galaxies experienced an intense burst of star formation sometime in the last half billion years, shutting down their star formation.<\/p>\n

This subsequent breakthrough research published in the\u00a0Astrophysical Journal<\/em><\/a>\u00a0outlines their new method to establish the star formation history of a post-starburst galaxy using its cluster population. This approach uses the age and mass estimates of stellar clusters to determine the strength and speed of the starburst that stopped more stars from forming in the galaxy. Using this method, the astronomers discovered that S12 experienced two periods of starburst before it no longer formed stars.<\/p>\n

\u201cPost-starbursts represent a phase of galaxy evolution that is pretty rare today,\u201d Smith explained. \u201cWe think that nearly half of all galaxies went through this phase at some point in their lives. So far, their star-forming histories have been determined almost exclusively from detailed modelling of their composite starlight.\u201d Smith has studied post-starburst galaxies for more than a decade, while Chandar works on the stellar clusters<\/a> in galaxies that are typically about three or four times closer than those in Smith\u2019s data.<\/p>\n

Stellar clusters<\/h3>\n

\u201cClusters are like fossils, they can be age-dated and give us clues to the past history of galaxies,\u201d Chandar said. \u201cClusters\u00a0can only be detected in these galaxies with the clear eyed-view of the Hubble Space Telescope. No clusters can be detected in even the highest quality images taken with telescopes on the ground.\u201d<\/p>\n

Smith has led several large multi-wavelength projects to gain a better understanding of the evolutionary history of post-starburst galaxies. He realised that the raw fuel for star formation, gas, and dust, is still present in surprising quantities in some of these systems including S12, despite no stars are currently being formed.<\/p>\n

\u201cWhile studying the light from these galaxies at multiple wavelengths has helped establish the time that the burst happened, we hadn\u2019t been able to determine how strong and how long the burst that shutoff star formation actually was,\u201d Smith added. \u201cAnd that\u2019s important to know to better understand how these galaxies evolve.\u201d<\/p>\n

The astronomers used well-studied cluster masses and star formation rates in eight nearby galaxies to develop the new method, which could be utilised to determine the recent star formation histories for multiple post-starburst systems. They applied their different approach to S-12, which is short for\u00a0SDSS 623-52051-207, since it was discovered and catalogued in the Sloan Digitized Sky Survey (SDSS). \u201cIt must have had one of the highest rates of star formation of any galaxy we have ever studied,\u201d Chandar said. \u201cS12 is the most distant galaxy I\u2019ve ever worked on.\u201d<\/p>\n

The study reveals that star formation in S12 shut off 70 million years ago after a short but intense burst formed some of biggest clusters on record, with masses several times higher than similar-age counterparts forming in actively merging galaxies. The method also revealed an earlier burst of star formation that the previous method of composite starlight modelling failed to detect. \u201cThese results suggest that S12\u2019s unusual history may be even more complicated than expected, with multiple major events compounding to fully shut off star formation,\u201d Smith declared.<\/p>\n

The research was funded by the National Science Foundation and NASA.<\/p>\n","protected":false},"excerpt":{"rendered":"

Astronomers at The University of Toledo established the star formation history of a post-starburst galaxy using its cluster population to understand galaxy evolution. The University of Toledo employed a husband-and-wife team of astronomers to join forces for the first time in their scientific careers during the pandemic to develop a new method to transform the […]<\/p>\n","protected":false},"author":19,"featured_media":15899,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[24615],"tags":[17008,3477,809],"acf":[],"yoast_head":"\nAstronomers create new method to understand galaxy evolution<\/title>\n<meta name=\"description\" content=\"Astronomers at The University of Toledo established the star formation of a post-starburst galaxy, using it to understand galaxy evolution.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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