The ISM Emission Explorer
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H II region
photoionized, 10⁴ K
Cold neutral medium
neutral, ~80 K
Warm neutral medium
neutral, ~8000 K
Emission line spectrum
Spectrum
Continuum
Resolution
Linear λ
Linear ε
y-axis range
Scroll to zoom in wavelength, drag to pan, double-click to fit the whole range.
Cooling budget
BPT diagram
[N II]/Hα
[S II]/Hα
[O I]/Hα
Strongest lines
Thermal balance
Ionization
State