Results 81 to 90 of about 1,740 (183)
Interstellar clouds containing optically thick H2
The Astrophysical Journal, 1975 The theory of Black and Delgarno that the relative populations of the excited rotational levels of H2 can be understood in terms of cascading following absorption in the Lyman and Werner bands is employed to infer the gas densities and radiation fields within diffuse interstellar clouds containing H2 that is optically thin in those bands.
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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
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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.
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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
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Pathway to the identification of C60+ in diffuse interstellar clouds. [PDF]
Philos Trans A Math Phys Eng Sci, 2016 Maier JP, Campbell EK.
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Hierarchical Structure and Self-gravity in the Maddalena Giant Molecular Cloud
The Astrophysical JournalIn this work, we present data from the Milky Way Imaging Scroll Painting project for the Maddalena giant molecular cloud (GMC). We decompose the ^13 CO emission datacube of the observed region into hierarchical substructures using a modified dendrogram ...
Renjie Shen +4 more
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The Astrophysical Journal LettersDense filaments are believed to be representative of the initial conditions of star formation in molecular clouds. We have used the MIRI instrument on JWST to image the massive filament NGC 6334M at d ∼ 1.3 kpc with unprecedented resolution and dynamic ...
Philippe André +6 more
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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
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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
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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
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