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Published 2016 | public
Book Section - Chapter

Observations of HDO in the high-mass formation regions

Abstract

Deuterated species are powerful tools to study the physical structure and dynamics of protostellar envelopes, yet their observations are still scarce. We present observations of the ground state 1(0),(1)-0(0,0) rotational transition of HDO at 464.925 GHz and the 1(1,0)-1(0,1) transition at 509.292 towards three high-mass star forming regions, carried out with the Caltech Submillimeter Observatory. The latter transition is observed for the first time from the ground. The HDO lines are modeled using a spherically symmetric radiative transfer code to derive the radial distribution of the HDO abundance in the target sources. The abundance profile is divided into an inner hot core region, with T > 100 K and a cold outer envelope with T < 100 K. The El(2)(18)O observations from Flagey et al. (2013) are used to calculate the H_2O abundance profile and thus, allow us to constrain the HDO/H_2O ratio in the envelopes of high-mass star forming regions.

Additional Information

© 2016 Polish Astronomical Society.

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August 20, 2023
Modified:
January 14, 2024