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- W2594304160 abstract "Wisconsin H-Alpha Mapper observations of Hα and [S ii] λ6716 emission are used to trace the vertical distribution and physical conditions of the warm ionized medium along the Sagittarius–Carina arm. CO emission, tracing cold molecular gas in the plane of the Galaxy, is used as a guide to isolate Hα and [S ii] λ6716 emission along individual spiral arms. Exponential scale heights of electron density squared (or emission measure) are determined using Hα emission above (below) the midplane to be along the near Sagittarius arm, along the near Carina arm, and along the far Carina arm. The emission measure scale height tends to increase as a function of Galactocentric radius along the Sagittarius–Carina arm for . Physical conditions of the ionized gas are analyzed using the [S ii]/Hα line ratio, which more closely traces IHα than height above the plane, z, suggesting a stronger relationship with the in situ electron density. We interpret this result as further evidence for the majority of the observed diffuse emission originating from in situ ionized gas as opposed to scattered light from classical H ii regions in the plane." @default.
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- W2594304160 date "2017-03-22" @default.
- W2594304160 modified "2023-10-16" @default.
- W2594304160 title "Warm Ionized Medium throughout the Sagittarius–Carina Arm" @default.
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- W2594304160 doi "https://doi.org/10.3847/1538-4357/aa63e6" @default.
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