SIMBAD references

2025NatAs...9..883S - Nature Astronomy, 9, 883-894 (2025/June-0)

Cospatial ice mapping of H2O with CO2 and CO across a molecular cloud with JWST/NIRCam.

SMITH Z.L., DICKINSON H.J., FRASER H.J., McCLURE M.K., NOBLE J.A., BOOGERT A.C.A., SUN F., EGAMI E., DARTOIS E., ERKAL J., SHIMONISHI T., BECK T.L., BERGNER J.B., CASELLI P., CHARNLEY S.B., CHU L., DROZDOVSKAYA M.N., GARROD R., HARSONO D., IOPPOLO S., JIMENEZ-SERRA I., JORGENSEN J.K., MELNICK G.J., OBERG K.I., PALUMBO M.E., PENDLETON Y.J., PEROTTI G., PONTOPPIDAN K.M., QASIM D., ROCHA W.R.M., STURM J.A., TAILLARD A., URSO R.G. and VAN DISHOECK E.F.

Abstract (from CDS):

In the coldest regions of molecular clouds, carbon and oxygen are incorporated into icy dust grains. Despite its outsized role in star and planet formation, sequential formation of ice is poorly constrained. Infrared spectroscopy probes ice chemistry, but previous telescopes observed insufficient lines of sight to map a single cloud. Here we present cospatial maps of H 2 O, CO 2 and CO ice over the central region of the Chamaeleon I molecular cloud, using 44 lines of sight observed with the James Webb Space Telescope. Correlations at column densities ten times larger than previous work suggest additional CO 2 ice formation in CO ice for the densest lines of sight. This large statistical sampling within a single cloud represents a step change in ice mapping, eliminating averaging over clouds with different intrinsic chemical environments. Mapping opens the door to probing gas-grain exchanges, snow lines and chemical evolution in the densest regions and drawing conclusions on the impact of ice chemistry on wider astrophysics.


Abstract Copyright: 2025 The Author(s)

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