Results 21 to 30 of about 792,921 (206)
Gas-Phase Reactivity of OH Radicals With Ammonia (NH3) and Methylamine (CH3NH2) at Around 22 K
Frontiers in Astronomy and Space Sciences, 2022 Interstellar molecules containing N atoms, such as ammonia (NH3) and methylamine (CH3NH2), could be potential precursors of amino acids like the simplest one, glycine (NH2CH2COOH).
Daniel González +7 more
doaj +1 more source
Investigating the Globally Collapsing Hub–Filament Cloud G326.611+0.811
The Astrophysical Journal, 2023 We present a dynamics study toward the G326.611+0.811 (G326) hub–filament system (HFS) cloud using new APEX observations of both ^13 CO and C ^18 O ( J = 2–1).
Yu-Xin He +10 more
doaj +1 more source
Inhomogeneity within Local Interstellar Clouds [PDF]
, 2022 Analysis of interstellar absorption lines observed in high-resolution {\em HST} spectra of nearby stars provides temperatures, turbulent velocities, and kinetic properties of warm interstellar clouds. Previous studies identified 15 warm partially ionized
Chasan-Taber, Adina +4 more
core +1 more source
Diffuse interstellar bands in the Taurus dark clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 1991 Strengths and profiles of seven diffuse interstellar bands have been measured in a group of field star situated behind the Taurus dark cloud complex. Comparison with current band family theories shows that, within a single cloud complex, the relative proportions of different family carriers can vary in rather close unison : although correlations with ...
A. J. Adamson +2 more
openaire +1 more source
Mixing Interstellar Clouds Surrounding the Sun [PDF]
, 2022 On its journey through the Galaxy, the Sun passes through diverse regions of the interstellar medium. High-resolution spectroscopic measurements of interstellar absorption lines in spectra of nearby stars show absorption components from more than a ...
Linsky, Jeffrey L +9 more
core +1 more source
Molecular hydrogen in interstellar dark clouds
The Astrophysical Journal, 1976 A simplified H2 formation mechanism is proposed in which small interstellar grains furnish the reaction sites. This mechanism results in a maximum value for the rate constant of about 2 by 10 to the -18th power per cu cm/sec for dark clouds at 10 K.
M. Allen, G. W. Robinson
openaire +1 more source
Formaldehyde in envelopes of interstellar dark clouds
The Astrophysical Journal, 1991 Observed formaldehyde column densities of 1 x 10 to the 12th - 3 x 10 to the 13th/sq cm in cloud envelopes along lines of sight with A(V) = 1-4 mag can not be explained with the current understanding of interstellar gas phase chemistry. However, these column densities can be reproduced by a simple time-dependent model in which H2CO is supplied to the ...
S. R. Federman, M. Allen
openaire +1 more source
Collapse models for dark interstellar clouds
The Astrophysical Journal, 1982 Properties of self-consistent numerical hydrodynamic models are compared with observed properties of several dark clouds. The results are consistent with the view that these clouds are undergoing gravitational collapse. The clouds appear to have evolved from similar initial states and to have ages comparable to their free-fall times.
K. R. Villere, D. C. Black
openaire +1 more source
The Astrophysical Journal, 2023 We report the first laboratory experiment dealing with the interaction of a cosmic dust simulant with positrons emitted from a ^22 Na radioisotope. Measurements of a charge of micrometer SiO _2 dust grains with an accuracy of one elementary charge e ...
Jan Wild +10 more
doaj +1 more source
Molecular hydrogen and its ions in dark interstellar clouds and star forming regions
, 2002 Fundamental observations of molecular hydrogen (H₂) in dark clouds, star forming regions, and radiation-dominated environments are presented, modeled, and interpreted.
Kulesa, Craig A.
core +5 more sources