Warm Ionized Medium Throughout the Sagittarius-Carina Arm
Dhanesh Krishnarao, L. Matthew Haffner, Robert A. Benjamin, Alex S., Hill, Kathleen A. Barger

TL;DR
This study maps the vertical distribution and physical conditions of the warm ionized medium along the Sagittarius-Carina arm using H-Alpha and [S II] emission, revealing scale heights and ionization characteristics.
Contribution
It provides detailed measurements of the WIM's scale heights and physical conditions along specific spiral arms, highlighting variations with Galactocentric radius and in-situ ionization evidence.
Findings
Electron density squared scale heights range from 300 to over 1000 pc.
Emission measure scale height increases with Galactocentric radius.
[S II]/H-Alpha ratio correlates with in-situ electron density.
Abstract
Wisconsin H-Alpha Mapper (WHAM) observations of H-Alpha and [S II] emission are used to trace the vertical distribution and physical conditions of the warm ionized medium (WIM) along the Sagittarius-Carina arm. CO emission, tracing cold molecular gas in the plane of the Galaxy, is used as a guide to isolate H-Alpha and [S II] emission along individual spiral arms. Exponential scale heights of electron density squared (or emission measure) are determined using H-Alpha emission above (below) the midplane to be pc ( pc) along the near Sagittarius arm, pc ( pc) along the near Carina arm, and pc 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 kpc. Physical conditions of the ionized gas are analyzed using…
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