English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present Herschel/HIFI observations of 30 transitions of waterisotopologues toward the high-mass star forming region NGC 6334 I. The lineprofiles of H_2^{16}O, H_2^{17}O, H_2^{18}O, and HDO show a complex pattern ofemission and absorption components associated with the embedded hot cores, alower-density envelope, two outflow components, and several foreground clouds,some associated with the NGC 6334 complex, others seen in projection againstthe strong continuum background of the source. Our analysis reveals an H2Oortho/para ratio of 3 +/- 0.5 in the foreground clouds, as well as the outflow.The water abundance varies from ~10^{-8} in the foreground clouds and the outerenvelope to ~10^{-6} in the hot core. The hot core abundance is two orders ofmagnitude below the chemical model predictions for dense, warm gas, but withinthe range of values found in other Herschel/HIFI studies of hot cores and hotcorinos. This may be related to the relatively low gas and dust temperature(~100 K), or time dependent effects, resulting in a significant fraction ofwater molecules still locked up in dust grain mantles. The HDO/H_2O ratio inNGC 6334 I, ~2 10^{-4}, is also relatively low, but within the range found inother high-mass star forming regions.

The Abundance, Ortho/Para Ratio, and Deuteration of Water in the High-Mass Star Forming Region NGC 6334 I