Herschel/HIFI spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2
Journal article, 2010

Herschel/HIFI observations of water from the intermediate mass protostar NGC 7129 FIRS 2 provide a powerful diagnostic of the physical conditions in this star formation environment. Six spectral settings, covering four H_2^16O and two H_2^18O lines, were observed and all but one H_2^18O line were detected. The four H_2^16O lines discussed here share a similar morphology: a narrower, \ap6 km s^-1, component centered slightly redward of the systemic velocity of NGC 7129 FIRS 2 and a much broader, \ap25 km s^-1 component centered blueward and likely associated with powerful outflows. The narrower components are consistent with emission from water arising in the envelope around the intermediate mass protostar, and the abundance of H_2O is constrained to \ap10^-7 for the outer envelope. Additionally, the presence of a narrow self-absorption component for the lowest energy lines is likely due to self-absorption from colder water in the outer envelope. The broader component, where the H_2O/CO relative abundance is found to be \ap0.2, appears to be tracing the same energetic region that produces strong CO emission at high J.
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Published in

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 521 Issue 1 p. L41+- art. no L41

Categorizing

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

Identifiers

DOI

10.1051/0004-6361/201015122

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Latest update

5/23/2019