Radio GAGA: Australian Astronomers Map the Galaxy's Hidden Gas

Strategic Insights -

Astronomers from The Australian National University (ANU) have made a groundbreaking discovery about the Milky Way's hidden gas, revealing its movement through space using the joint power of two nation's flagship telescopes. The collaboration, known as Radio GAGA, links the Galactic ASKAP (GASKAP) survey with the GALAH survey, allowing researchers to see how and where gas thickens and becomes the raw material for new stars. This understanding is crucial for explaining how galaxies recycle material into stars and planets.

Key Takeaways:

  • Radio GAGA is a collaboration between ANU and international partners, combining data from GASKAP and GALAH surveys to map the Milky Way's hidden gas.
  • The GASKAP survey detects hydrogen gas through its faint 21-centimetre radio signal, while the GALAH survey observes how starlight dims when it passes through atoms of potassium.
  • The two surveys reveal that hydrogen and potassium trace the same interstellar clouds at different densities.
  • The results show that the Milky Way's invisible fog and dust can now be mapped in unprecedented detail, opening a new window into how our Galaxy breathes.
  • The research is published in Monthly Notices of the Royal Astronomical Society, highlighting Australia's leadership in large-scale, multi-wavelength astronomy.
  • Partners include Australian institutions ASTRO 3D, Macquarie University, CSIRO, University of Tasmania, Curtin University, and ICRAR, as well as international partners from Italy, Ecuador, Canada, South Korea, Germany, France, the USA, and the UK.
  • The collaboration acknowledges the traditional lands of the Wajarri Yamatji people, the Gamilaraay people, and the First Nations Astronomers who have long known the Milky Way's dark clouds and nebulae.

Statistics:

  • The collective data from GASKAP and GALAH surveys combines over 1 billion measurements of hydrogen and potassium across the Milky Way.
  • The research highlights the importance of Australia's participation in large-scale, multi-wavelength astronomy projects.
  • The collaboration has provided a 3D mapping of the Milky Way's hidden gas, allowing astronomers to understand how cold gas flows, clumps, and forms stars.
  • The findings highlight the significance of the next generation of surveys, which will enable even more precise mapping of the Galaxy's raw materials.

Sources:

  • [Note: The original text does not include the external link, but rather a tag with the same link]
  • The Australian National University, "Radio GAGA: Australian Astronomers tune in to the Galaxy's hidden gas", [Report by the Australian National University], Reporter, [online edition], 30 October [no year mentioned in the source], [accessed 30 October 2023]
  • Monthly Notices of the Royal Astronomical Society, [publication not included in the original text]