Results 1 to 10 of about 36,750 (220)
Boron abundances in diffuse interstellar clouds [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractWe present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II λ1362 resonance line, with each detection confirmed by the presence of absorption from other dominant ions at the same ...
Ritchey, A. M. +3 more
openaire +3 more sources
The Effect of an Inert Solid Reservoir on Molecular Abundances in Dense Interstellar Clouds
Open Astronomy, 2012 The question, what is the role of freeze-out of chemical species in determining the molecular abundances in the interstellar gas is a matter of debate.
Kalvāns Juris, Shmeld Ivar
doaj +2 more sources
Laboratory detection and rotational spectroscopy of trans-HNSO: implications for astronomical observations [PDF]
Frontiers in ChemistrySulfur-bearing molecules are central to interstellar chemistry, yet their observed abundances in the gas phase remain far below cosmic expectations in dense interstellar regions.
Valerio Lattanzi +4 more
doaj +2 more sources
Benchmark Studies on the Isomerization Enthalpies for Interstellar Molecular Species
Journal of Nigerian Society of Physical Sciences, 2023 With the well-established correlation between the relative stabilities of isomers and their interstellar abundances coupled with the prevalence of isomeric species among the interstellar molecular species, isomerization remains a plausible formation ...
Emmanuel Etim (PhD)
doaj +1 more source
Abundance Ratios of OH/CO and HCO+/CO as Probes of the Cosmic-Ray Ionization Rate in Diffuse Clouds
The Astrophysical Journal, 2023 The cosmic-ray ionization rate (CRIR, ζ _2 ) is one of the key parameters controlling the formation and destruction of various molecules in molecular clouds. However, the current most commonly used CRIR tracers, such as ${{\rm{H}}}_{3}^{+}$ , OH ^+ , and
Gan Luo +8 more
doaj +1 more source
Ionize Hard: Interstellar PO+ Detection
Frontiers in Astronomy and Space Sciences, 2022 We report the first detection of the phosphorus monoxide ion (PO+) in the interstellar medium. Our unbiased and very sensitive spectral survey toward the G+0.693–0.027 molecular cloud covers four different rotational transitions of this molecule, two of ...
Víctor M. Rivilla +17 more
doaj +1 more source
Interstellar Extinction and Elemental Abundances [PDF]
The Astrophysical Journal Supplement Series, 2021 Abstract Elements in the interstellar medium (ISM) exist in the form of gas or dust. The interstellar extinction and elemental abundances provide crucial constraints on the composition, size, and quantity of interstellar dust. Most of the extinction modeling efforts have assumed the total (gas and dust) abundances of the dust-forming ...
Zuo, W. B., Li, Aigen, Zhao, Gang
openaire +2 more sources
Quantum mechanical modeling of interstellar molecules on cosmic dusts: H2O, NH3, and CO2
Frontiers in Chemistry, 2022 Since the first detection of CH molecule in interstellar medium (ISM), more than 270 molecules have been identified in various astronomical sources in ISM.
Fangfang Li +9 more
doaj +1 more source
The Distribution of Metallicities in the Local Galactic Interstellar Medium
The Astrophysical Journal, 2023 In this investigation, we present an analysis of the metallicity distribution that pertains to neutral gas in the local Galactic interstellar medium (ISM).
Adam M. Ritchey +5 more
doaj +1 more source
Survey of CH3NH2 and its Formation Process
The Astrophysical Journal, 2023 We present the observational results of a precursor of glycine, methylamine (CH _3 NH _2 ), together with methanol (CH _3 OH) and methanimine (CH _2 NH) for the high-mass star-forming regions NGC 6334I, G10.47+0.03, G31.41+0.3, and W51 e1/e2 using the ...
Taiki Suzuki +9 more
doaj +1 more source