Results 131 to 140 of about 889,569 (256)
Copernicus observations of C I and CO in diffuse interstellar clouds [PDF]
Copernicus was used to observe absorption lines of C I in its ground state and excited fine structure levels and CO toward 29 stars. We use the C I data to infer densities and pressures within the observed clouds, and because our results are of higher ...
Jenkins, E. B. +2 more
core +1 more source
Cloud-cloud collisions in the interstellar medium
The Astrophysical Journal, 1980 Results are presented from time-dependent numerical simulations of cloud-cloud collisions in the interstellar medium. Special emphasis is placed on physically detailed models of cloud collisions. The numerical simulations include heating, cooling, thermal conductivity, self-gravity, and molecule formation; magnetic fields have been neglected.
openaire +1 more source
A Pan-galaxy Study of Synthetic Giant Molecular Filaments: A Turbulence-dominated Life Cycle
The Astrophysical Journal Supplement SeriesRecent surveys of the Galactic plane have revealed dozens of giant molecular filaments (GMFs), with lengths ranging from tens to hundreds of parsecs, yet their origins and life cycles remain debated. In this work, we analyze over 700 GMFs identified from
Zipeng Hu +3 more
doaj +1 more source
Relative Velocities between 13CO Structures within 12CO Molecular Clouds
The Astronomical JournalVelocity fields of molecular clouds (MCs) can provide crucial information on the merger and split between clouds, as well as their internal kinematics and maintenance, energy injection and redistribution, and even star formation within clouds.
Lixia Yuan +12 more
doaj +1 more source
Pathway to the identification of C60+ in diffuse interstellar clouds. [PDF]
Philos Trans A Math Phys Eng Sci, 2016 Maier JP, Campbell EK.
europepmc +1 more source
Photoabsorption and photodissociation of molecules important in the interstellar medium [PDF]
Photoabsorption and fluorescence cross sections of molecules important in the interstellar medium were measured in the 90 to 200 nm region using synchrotron radiation, excimer laser, and condensed discharge lamps as light sources.
Lee, Long C., Suto, Masako
core +1 more source
The Astronomical JournalWe present the first detection of helium radio recombination lines (HeRRLs) at 800 MHz from the diffuse ionized gas (DIG) in the Cygnus X region, with an ionized helium-to-hydrogen ratio ( ${{n}}_{{\rm{H}}{\rm{e}}}^{+}/{{n}}_{{\rm{H}}}^{+}$ ) of 0.06 ± 0.
D. Anish Roshi +6 more
doaj +1 more source
Interstellar and cometary dust [PDF]
Aspects of interstellar dust which are known from direct observation will be discussed. Some specific difficulties that various theories have in explaining the observations will be presented.
Mathis, John S.
core +1 more source
The Young Ages of 70 μm Dark Clumps Inferred from Carbon Chain Chemistry
The Astrophysical JournalThe physical conditions of the earliest environment of high-mass star formation are currently poorly understood. To that end, we present observations of the carbon chain molecules HC _5 N, CCS, and HC _7 N in the 22–25 GHz band toward 12 high-mass 70 μ m
Kadin Worthen +6 more
doaj +1 more source
Hierarchical Structure and Self-gravity in the Rosette Molecular Cloud
The Astrophysical JournalWe analyze the hierarchical structure in the Rosette molecular cloud using ^13 CO J = 1–0 data from the Milky Way Imaging Scroll Painting survey with a nonbinary Dendrogram algorithm that allows multiple branches to emerge from parent structures. A total
Suziye He +8 more
doaj +1 more source