A dataset provided by the European Space Agency

Name OT2_bgodard_1
Title Turbulent dissipation in the diffuse medium : its dynamics revealed by combined HIFI observations of 13CH+ and SH+
URL

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DOI 10.5270/esa-sp5ext2
Author godard, b.
Description Among all species detected in the diffuse interstellar medium, CH+ and SH+ are unique. Since their main production pathways are highly endo-energetic, their large observed abundances are likely the signature of the dissipation of turbulence. In addition, since the energies involved in their formation differ by more than a factor of 2, a comparative analysis of CH+ and SH+ provides essential clues on the nature of the dynamical processes involved in turbulent dissipation. We propose here to perform sensitive Herschel-HIFI observations of 13CH+ and SH+ in absorption towards 5 background dust continuum sources located in the inner Galaxy : W49N, G34, W51, DR21(OH), and W33A. Each line-of-sight samples kiloparsecs of diffuse interstellar matter. Given the sensitivity and resolution of HIFI, we propose to reach a signal-noise ratio of about 300 in order to analyze the velocity structure of individual clouds along the sightlines. This project has two main goals : (1) characterize the kinematic signatures of the 13CH+ and SH+ absorption lines and compare them, statistically, to those of molecular species whose formation routes are less (or not) endothermic and (2) confront the 13CH+ and SH+ abundances to model predictions in order to directly derive for the first time the turbulent dissipation rate and the ion-neutral velocity drift driving dissipation in individual diffuse clouds.
Publication
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2012-05-02T20:47:11Z/2012-11-03T09:07:45Z
Version SPG v14.1.0
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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-05-03T08:26:31Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-05-03T08:26:31Z, OT2_bgodard_1, SPG v14.1.0. https://doi.org/10.5270/esa-sp5ext2