Ubiquitous argonium (ArH+) in the diffuse interstellar medium: A molecular tracer of almost purely atomic gas

2014/03/31 by Peter Schilke, P. Schilke, David A. Neufeld +29 · 1 citation
Chemistry · Physics and Astronomy · #Absorption (acoustics) #Advanced Chemical Physics Studies #Analytical Chemistry (journal) #Astrochemistry #Astrophysics #Astrophysics and Star Formation Studies #Atomic physics #Chemistry #Context (archaeology) #Environmental chemistry #Hydride #Hydrogen #Interstellar medium #Line (geometry) #Molecular Spectroscopy and Structure #Nuclear physics #Optics #Physics #TRACER #astro-ph.GA

paper · pdf · doi:10.1051/0004-6361/201423727

published as Astron. Astrophys. 566 (2014) Art. No. A29 · 12 pages, 11 figures, Astronomy and Astrophysics, accepted revised version: previous version had column density of SgrB2 sources wrong

openalex publication_date 2014/04/02 · arxiv created 2014/04/14 · arxiv updated 2014/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Aims. We describe the assignment of a previously unidentified interstellar absorption line to ArH+ and discuss its relevance in the context of hydride absorption in diffuse gas with a low H2 fraction. The confidence of the assignment to ArH+ is discussed, and the column densities are determined toward several lines of sight. The results are then discussed in the framework of chemical models, with the aim of explaining the observed column densities.

Citations

• Detection of a Noble Gas Molecular Ion, 36ArH⁺, in the Crab Nebula
• Black hole accretion and star formation as drivers of gas excitation and chemistry in Markarian 231
• Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update
• TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. VI. GALACTIC STRUCTURE, FUNDAMENTAL PARAMETERS, AND NONCIRCULAR MOTIONS
• The evolution and explosion of massive stars
• Gas flow models in the Milky Way embedded bars
• The Diffuse Interstellar Bands
• Isotopic compositions of the elements 2009 (IUPAC Technical Report)
• Modelling H2 formation in the turbulent interstellar medium: solenoidal versus compressive turbulent forcing
• Comparative study of CH+and SH+absorption lines observed towards distant star-forming regions
• Interstellar OH+, H2O+and H3O+along the sight-line to G10.6–0.4

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