The Complexity of the Cetus Stream Unveiled from the Fusion of STREAMFINDER and StarGO

Understand

We combine the power of two stream-searching tools, STREAMFINDER and StarGO applied to the Gaia EDR3 data, to detect stellar debris belonging to the Cetus stream system that forms a complex, nearly polar structure around the Milky Way.

• In this work, we find the southern extensions of the northern Cetus stream as the Palca stream and a new southern stream, which overlap on the sky but have different distances.
• These two stream wraps extend over more than $\sim100\deg$ on the sky ($-60\deg<\delta<+40\deg$).
• The current N-body model of the system reproduces both wraps in the trailing arm.