Gaia Finds Ancient Satellite Galaxy Pontus Embedded in Milky Way - here's Astroguyz on an amazing find, courtesy of ESAGaia -
five known streamsThe sixth new stream is dubbed ‘Pontus,’ meaning ‘sea in Greek. The name is fitting, as Pontus was the first child of Gaia, the Greek Goddess of the Earth. This sixth new stream points at a possible satellite galaxy devoured long ago, perhaps 8-10 billion years in the past. For context, our solar system formed 4.5 billion years ago, and has journeyed only about 18 times around the galactic center in its once every quarter of a billion year orbit.
Anatomy of a collision: how the Milky Way can absorb a small satellite galaxy like Pontus over time. Credit: ESA simulation labs. These remnant streams span the sky on a dark night. Messier objects M92 and M13 in Hercules are cited in the study as possible members of the Pontus stream. Both of these famous globular clusters are visible in an amateur telescope.Of course, we’re looking forward to the full Data Release DR3 this year, which was delayed due to the global pandemic. Gaia has thus far lasted well beyond its five year nominal mission and has exceeded expectations.
Gaia builds on knowledge gathered from the Hipparcos astrometry mission and may one day be followed by the proposed GaiaNIR mission. The discovery of a sixth remnant stream is an amazing find, and is an impressive example of astronomical forensics. This intriguing discovery also serves as a mere hint of what other strange finds await.
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