Spatial distribution of NH2D in massive star-forming regions

Abstract

To understand the relation between NH${}_2$D and its physical environment, we mapped ortho-NH${}_2$D $1_{11}^s-1_{01}^a$ at 85.9 GHz toward 24 Galactic late-stage massive star-forming regions with Institut de Radioastronomie Millim$\acute{e}$trique (IRAM) 30-m telescope. Ortho-NH${}_2$D $1_{11}^s-1_{01}^a$ was detected in 18 of 24 sources. Comparing with the distribution of H${}^{13}$CN 1-0 as a dense gas tracer and radio recombination line H42$\alpha$, ortho-NH${}_2$D $1_{11}^s-1_{01}^a$ present complex and diverse spatial distribution in these targets. 11 of the 18 targets, present a different distribution between ortho-NH${}_2$D $1_{11}^s-1_{01}^a$ and H${}^{13}$CN 1-0, while no significant difference between these two lines can be found in the other 7 sources, mainly due to limited spatial resolution and sensitivity. Moreover, with H42$\alpha$ tracing massive young stellar objects, ortho-NH${}_2$D $1_{11}^s-1_{01}^a$ seems to show a relatively weak emission near the massive young stellar objects.

30 pages, 20 figures, 4 tables. Accepted to MNRAS

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