A dataset provided by the European Space Agency

Name OT1_vossenko_4
Title The origin of H2O+ in dense clouds
URL

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DOI https://doi.org/10.5270/esa-6bpp9ez
Author ossenkopf, v.
Description We try to resolve the chemical evolution of oxygen hydrides in
radiatively heated dense clouds. This involves in particular H2O+
and chemically related species, which are formed by gas-phase
reactions initiated by cosmic ray ionization in diffuse clouds, but
may be predominantly produced by the evaporation of icy grain
mantles and the subsequent ionization of water by UV radiation
in heated dense clouds. We will investigate the full chain of species
OH+, H2O+, H3O+, OH, and H2O, connected by gas phase
reactions, to quantify the contribution of ice evaporation in dense
clouds.

We propose to observe these species in the dense layers known to
exist in two massive star-forming regions, DR21(C), where
indications of H2O+ from hot gas were already found and where
the hot layer is affected both by UV radiation and a strong shock
from a bipolar outflow, and Mon R2, a PDR with similar parameters
but no indications of shock processing of the hot layer.

Differences between the results from the two sources will provide
an estimate for the impact of shocks on the H2O+ production. By
comparing the observed abundances of OH+, H2O+, H3O+, OH,
and H2O with steady-state PDR models, we will be able to
quantify the amount of water that is fed into the gas phase by the
evaporation or photodesorption of ice mantles from dust grains.
Publication
Instrument HIFI_HifiPoint_dbs, PACS_PacsLineSpec_point
Temporal Coverage 2011-04-22T08:40:55Z/2012-12-21T20:52:20Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-06-21T20:27:09Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, ossenkopf, v., 2013, OT1_vossenko_4, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-6bpp9ez