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Table 3

Summary of sources whose ice spectra are compared to laboratory NH4 SH spectra in this work.

Source Telescope Source Type Environment Thermal processing (a)
Elias 16 Spitzer Dense cloud No processing
CK2 Spitzer dense cloud No processing
B1-c JWST LYSO Clustered Little/no processing
L1527 JWST LYSO Isolated Highly processed
W33A ISO MYSO Little/no processing
S140 IRS 1 ISO MYSO Highly processed

Notes. (a) As is indicated by presence of a pure CO2 component in the 4.39 µm 13CO2 ice feature, a crystalline 3 µm H2O ice feature, and/or a low optical depth of the 4.67 µm CO ice feature relative to the optical depth of the 4.27 µm CO2 feature.

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