Results 111 to 120 of about 35,251 (238)

On the Interpretation of Mid-infrared Absorption Lines of Gas-phase H2O as Observed by JWST/MIRI

open access: yesThe Astrophysical Journal Supplement Series
Rovibrational absorption lines of H _2 O in the 5–8 μ m wavelength range selectively probe gas against the mid-infrared continuum-emitting background of the inner regions of young stellar objects and active galactic nuclei and deliver important ...
Jialu Li   +2 more
doaj   +1 more source

First Extragalactic Detection of Thermal Hydroxyl (OH) 18 cm Emission in M31 Reveals Abundant CO-faint Molecular Gas

open access: yesThe Astrophysical Journal
The most abundant interstellar molecule, molecular hydrogen (H _2 ), is practically invisible in cold molecular clouds. Astronomers typically use carbon monoxide (CO) to trace the bulk distribution and mass of H _2 in our galaxy and many others.
Michael P. Busch
doaj   +1 more source

Boundary conditions for the paleoenvironment: Chemical and physical processes in the pre-solar nebula [PDF]

open access: yes
Detailed study of the first interstellar hydrocarbon ring, cyclopropenylidene (C3H2), is continuing. The singly deuterated isotope of this molecule, C3HD, was observed in several cold interstellar clouds.
Irvine, William M., Schloerb, F. Peter
core   +1 more source

Composition, structure and chemistry of interstellar dust [PDF]

open access: yes
The observational constraints on the composition of the interstellar dust are analyzed. The dust in the diffuse interstellar medium consists of a mixture of stardust (amorphous silicates, amorphous carbon, polycyclic aromatic hydrocarbons, and graphite ...
Allamandola, Louis J.   +1 more
core   +1 more source

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