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Determine the emission mechanism of the southeastern enhanced patch

Determine whether the southeastern enhanced radio emission associated with Teleios (G305.4–2.2) is thermal free–free emission or nonthermal synchrotron emission by measuring a reliable local spectral index and applying complementary diagnostics (e.g., polarisation, Hα association).

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Background

Teleios exhibits an extended radio enhancement inside the southeastern edge of the shell coincident with weak Hα emission. Without a reliable local spectral index, the thermal versus nonthermal nature of this patch remains uncertain.

Clarifying the emission mechanism is important for interpreting potential shock–ISM interactions, reverse-shock signatures, or unrelated thermal structures projected along the line of sight.

References

In the absence of a reliable spectral index for the exterior and interior emission in this location, we cannot 100% rule out a priori that this enhanced patch of Teleios radio emission is free-free.

— Teleios (G305.4-2.2) -- the mystery of a perfectly shaped new Galactic supernova remnant (2505.04041 - Filipovic et al., 7 May 2025) in Section 3.1 (Teleios’s morphology and classification)