|Mapping Water and related Hydrides in Massive Protostellar outflows with HIFI
|Massive outflows are known to drive a special chemical complexity due to the strong shocks they produce in the surrounding molecular material. Hydrides are key ingredients of interstellar chemistry since they are the initial products of chemical networks that lead to the formation of more complex molecules. Given their small reduced masses, their rotational lines lie at short sub-mm wavelengths, which are almost unobservable from the ground. With the HIFI instrument on board of the Herschel satellite it is now possible to observe the strongest transitions of light hydrides, in particular H2O but also the reactive ions OH+ and H2O+, which are thought to play a crucial role in the formation of OH and H2O. HIFI early results revealed that indeed water and its cation H2O+ are abundant components of the interstellar medium. The additional HIFI detection of OH+ is an important confirmation of the gas-phase route of water. Although key programs have targeted few massive sources to map the water distribution, a comprehensive study including other important hydrides such as OH+ and H2O+, and covering sources in different evolutionary phases, has not been provided yet. This project proposes a dedicated study of water and related hydrides (H2O+ and OH+) in massive protostellar outflows in order to: a) trace the water distribution throughout the different evolutionary phases of massive star formation, b) determine the contribution of water emission in the energy lost by shocks, and c) unveil the role of ions such as OH+ and H2O+ in the production of water.
|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.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT2_agomezru_2, SPG v14.1.0. https://doi.org/10.5270/esa-33h7wuf