Results 1 to 10 of about 4,488,038 (359)
The Molecular Cloud Lifecycle [PDF]
Space Science Reviews, 2020 Giant molecular clouds (GMCs) and their stellar offspring are the building blocks of galaxies. The physical characteristics of GMCs and their evolution are tightly connected to galaxy evolution.
M. Chevance +11 more
semanticscholar +7 more sources
Turbulent molecular clouds [PDF]
The Astronomy and Astrophysics Review, 2012 Stars form within molecular clouds but our understanding of this fundamental process remains hampered by the complexity of the physics that drives their evolution. We review our observational and theoretical knowledge of molecular clouds trying to confront the two approaches wherever possible.
Patrick Hennebelle +2 more
arxiv +9 more sources
Molecular clouds in the Galaxy [PDF]
The Astrophysical Journal, 1975 The J = 1 → 0 emission of CO has been surveyed in the galactic plane between ℓ = -10° and +90° with a U beam sampling every degree. Molecular clouds emitting in the CO line are plentiful over the inner region of the Galaxy. Their greatest number occurs in the galactic nucleus and at a radius of 5.5 kpc—a distribution similar to radio H II regions and ...
Scoville, N. Z., Solomon, P. M.
openaire +6 more sources
Biogenic, urban, and wildfire influences on the molecular composition of dissolved organic compounds in cloud water [PDF]
Atmospheric Chemistry and Physics, 2017 Organic aerosol formation and transformation occurs within aqueous aerosol and cloud droplets, yet little is known about the composition of high molecular weight organic compounds in cloud water.
R. D. Cook +19 more
doaj +2 more sources
Formation of Massive Molecular Cloud Cores by Cloud-cloud Collision [PDF]
, 2013 Recent observations of molecular clouds around rich massive star clusters including NGC3603, Westerlund 2, and M20 revealed that the formation of massive stars could be triggered by a cloud-cloud collision. By using three-dimensional, isothermal, magnetohydrodynamics simulations with the effect of self-gravity, we demonstrate that massive ...
T. Inoue, Y. Fukui
arxiv +3 more sources
Evolving Molecular Cloud Structure and the Column Density Probability Distribution Function [PDF]
, 2014 The structure of molecular clouds can be characterized with the probability distribution function (PDF) of the mass surface density. In particular, the properties of the distribution can reveal the nature of the turbulence and star formation present inside the molecular cloud.
R. L. Ward, J. Wadsley, A. Sills
arxiv +3 more sources
High Altitude Molecular Clouds [PDF]
The Astrophysical Journal, 1994 A population of molecular clouds with a significantly greater scale height than that of Giant Molecular Clouds has been identified by examining maps of the latitude distribution of the $^{12}CO(1-0)$ emission in the first quadrant of the Galaxy. These clouds are found by identifying emission more than 2.6 times the scale-height away from the galactic ...
arxiv +5 more sources
3D MC. I. X-Ray Tomography Begins to Unravel the 3D Structure of a Molecular Cloud in our Galaxy’s Center [PDF]
The Astrophysical Journal LettersAstronomers have used observations of the Galactic gas and dust via infrared, microwave, and radio to study molecular clouds in extreme environments such as the Galactic center.
Samantha W. Brunker +7 more
doaj +2 more sources
Molecular Clouds in Spiral Galaxies [PDF]
Symposium - International Astronomical Union, 1983 A large observational program investigating the 2.6 mm CO line in spiral galaxies is being conducted by myself and Nick Scoville using the 14 m telescope of the Five College Radio Astronomy Observatory (HPBW = 50″). Thus far we have observed 46 galaxies of types Sa, Sb, Sc and Irr, detected 31, and mapped 16.
Judith S. Young, Nick Z. Scoville
openaire +4 more sources
An Ice Age JWST inventory of dense molecular cloud ices [PDF]
Nature Astronomy, 2023 Icy grain mantles are the main reservoir of the volatile elements that link chemical processes in dark, interstellar clouds with the formation of planets and the composition of their atmospheres.
M. McClure +41 more
semanticscholar +1 more source