A dataset provided by the European Space Agency

Name OT1_cpersson_1
Title Investigation of the nitrogen chemistry in diffuse and dense interstellar gas
URL

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DOI https://doi.org/10.5270/esa-h5oudpg
Author European Space Agency
Description We propose to investigate the interstellar chemistry and physics of nitrogen
through Herschel/HIFI observations of simple nitrogen-hydride molecules
including NH, NH2, NH3, and related ions. The nitrogen chemistry is still
rather uncertain and we therefore propose to compare and contrast the
abundances and ortho/para ratios of nitrogen hydrides in the diffuse
interstellar gas to the dense cores of molecular clouds. This comparison
can be done very efficiently by observing excited-state transitions in
selected cores that have previously been used in the PRISMAS program as
background sources for absorption measurements in the ground-state
transitions. In this way, we will determine whether nitrogen chemistry is
dominated by gas-phase reactions or by processes on surfaces of dust
grains, and whether the dominant chemistry is different in different
parts of the interstellar medium.
In summary, we propose HIFI observations of 5 transitions of simple
nitrogen-bearing molecules in 8 sources, and 3 transitions in 2 sources.
The total requested observing time is 26.2 hours.
Publication Ortho-to-para ratio of NH2. Herschel-HIFI observations of ortho- and para-NH2 rotational transitions towards W31C, W49N, W51, and G34.3+0.1 . Persson C. M. et al. . Astronomy & Astrophysics, Volume 586, id.A128, 20 pp. . 586 . 10.1051\/0004-6361\/201526781 . 2016A&A...586A.128P ,
Herschel Survey of Galactic OH+, H2O+, and H3O+: Probing the Molecular Hydrogen Fraction and Cosmic-Ray Ionization Rate . Indriolo Nick et al. . The Astrophysical Journal, Volume 800, Issue 1, article id. 40, 26 pp. (2015). . 800 . 10.1088\/0004-637X\/800\/1\/40 . 2015ApJ...800...40I ,
Instrument HIFI_HifiPoint_dbs, HIFI_HifiFS_freq
Temporal Coverage 2011-09-16T06:05:16Z/2012-10-16T22:30:42Z
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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-04-16T22:22:56Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, Investigation Of The Nitrogen Chemistry In Diffuse And Dense Interstellar Gas, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-h5oudpg