Fig. 2: Cospatial ice maps and correlations of ice column densities with H2 column density in Cha I.
From: Cospatial ice mapping of H2O with CO2 and CO across a molecular cloud with JWST/NIRCam
Left, cospatial ice maps of H2O (blue), CO2 (purple) and CO (green) column densities across the 44 sources where all three ices were detected towards Cha I. The positions of the 44 individual background sources are indicated by circles with a symbol size reflecting the object’s flux density at 4.1 μm, with the background stars NIR38 (NE) and J110621 (SW)27,33,34 labelled in white. The positions of the deeply embedded class 0 YSO Cha MMS1 and a possible prestellar core identified by ref. 38 are indicated by a yellow star and a white cross, respectively. The log-scale H2 column density contours derived from Herschel far-infrared observations39,40,41 are overplotted. For details of the ice map construction, see Methods. Right, correlation plots for H2O (blue), CO2 (purple) and CO (green) column densities against H2 column density. Open symbols denote sources for which there was partial wavelength coverage of the H2O absorption band. Ice column densities are presented as mean values with error bars of 95% confidence intervals, except for open symbols where the extremes of the fitted templates were used (see Methods for full details).
