Ammonium hydrosulfide (NH4SH) as a potentially significant sulfur sink in interstellar ices

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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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