Resumo

CANTO, J.  e  RAGA, A. C.. Analytic Solutions for Truncated Plasmons. Rev. mex. astron. astrofis [online]. 2021, vol.57, n.1, pp.181-188.  Epub 30-Set-2021. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2021.57.01.13.

We present a new plasmon model for a cometary clump moving supersonically in an environment with a non-zero gas pressure. We find that the environmental pressure produces a cutoff in the wings of the cometary clump, therefore resulting in quite \stubby" plasmons for a large range of ow Mach numbers. We derive a relation between the length-to-width ratio of the plasmon and the Mach number M of the ow, which could be used to directly derive M from observations of (appropriate) cometary clumps.

Palavras-chave : HII regions; shock waves.

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