ALMA Unveils Largest and Most Detailed Image of the Milky Way’s Galactic Center Ever Captured

Discover the record-setting image captured by astronomers from the Atacama Large Millimeter/Submillimeter Array (ALMA) as they unveil the intricate molecular center of our Milky Way galaxy.

This image showcases the intricate distribution of molecular gas in the Milky Way’s Central Molecular Zone (CMZ). Image credits: ALMA / ESO / National Astronomical Observatory of Japan / NRAO / Longmore et al. / Miniti et al..

“It’s an extreme environment, hidden from our view, now revealed in stunning detail,” remarked ESO astronomer Dr. Ashley Burns.

In collaboration with the ALMA CMZ Exploration Survey (ACES), Dr. Barnes and colleagues have meticulously mapped over 650 light-years of the Central Molecular Belt, enveloping our galaxy’s supermassive black hole.

This groundbreaking study offers the most detailed view to date of the cold gas fueling star formation in this turbulent region, detecting a variety of molecules from simple silicon compounds to complex organic species.

“This is the closest galactic nucleus to Earth that we can study with such granularity,” Dr. Burns stated.

“While designing the survey, we anticipated a high level of detail, yet we were genuinely astonished by the intricate complexity unveiled in the final mosaic,” said Dr. Katharina Immer, ALMA astronomer at ESO.

This unique dataset introduces never-before-seen central molecular zones, illustrating gas structures spanning tens of light-years down to minute gas clouds surrounding individual stars.

“The central molecular belt harbors some of the most massive stars known in our galaxy. Many of these stars have short lifespans, culminating in spectacular supernova events,” explained ACES leader Professor Steve Longmore, astrophysicist at Liverpool John Moores University.

With the ACES project, astronomers aim to deepen our understanding of how such phenomena influence star formation and whether existing theories of star formation apply even in extreme environments.

“By investigating star formation in the central molecular belt, we can elucidate how galaxies develop and change over time,” Professor Longmore added.

“We believe this region shares many traits with galaxies in the early universe, where star formation occurs in chaotic, extreme settings.”

The latest findings from ACES are published in the Royal Astronomical Society Monthly Notices.