A dataset provided by the European Space Agency

Name OT1_dneufeld_1
Title Studying diffuse interstellar clouds with observations of hydrides
URL

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DOI 10.5270/esa-uym9uoy
Author neufeld, d.
Description With the use of the HIFI instrument, we propose to observe four simple hydride molecules - HF, OH+, H2O+, and H2Cl+ - in absorption towards five bright submillimeter continuum sources. The target sources, all located in the Galactic plane with sight-lines that intersect multiple interstellar clouds, are the massive star-forming regions W49N, W51, G29.96-0.02, W3(OH), and G330.95-0.17. This selection of sources samples sight-lines in the 1st and 4th quadrants of the Galaxy and in the outer Galaxy. The proposed observations will have integration times sufficient to obtain signal-to-noise ratios in the range 100 - 400 in a single spectral channel, providing great sensitivity to absorption by foreground material. We will thereby determine the molecular column densities in foreground clouds located in spiral arms that lie along the sight-lines to these continuum sources. The four molecules we will observe, all detected previously in the ISM in early Herschel observations, will provide critical information about the diffuse interstellar medium. In particular, HF will permit the identification and study of clouds with a very small H2 column density that may be virtually undetectable in the spectra of other molecules; OH+ and H2O+ will allow us to study clouds with a small molecular fraction (revealed by a large OH+-H2O+ ratio), and to determine the cosmic ray ionization rate as a function of Galactocentric radius; and H2Cl+ will probe the photoionization rate and its variation with position in the Galaxy.
Publication Herschel* Observations of Interstellar Chloronium. II. - Detections toward G29.96-0.02, W49N, W51, and W3(OH), and Determinations of the Ortho-to-Para and 35Cl-37Cl Isotopic Ratios . Neufeld David A. et al. . The Astrophysical Journal, Volume 807, Issue 1, article id. 54, 12 pp. (2015). . 807 . 10.1088\/0004-637X\/807\/1\/54 . 2015ApJ...807...54N ,
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2013-03-26T16:20:35Z/2013-03-28T09:52:36Z
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 2013-09-28T09:36:53Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-09-28T09:36:53Z, OT1_dneufeld_1, SPG v14.1.0. https://doi.org/10.5270/esa-uym9uoy