Results 1 to 10 of about 4,605,523 (385)

The Molecular Cloud Lifecycle. [PDF]

Space Sci Rev, 2020
AbstractGiant 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. The macroscopic properties of the interstellar medium propagate into the properties of GMCs condensing out of it, with correlations between e.g.
Chevance M, Kruijssen JMD, Vazquez-Semadeni E, Nakamura F, Klessen R, Ballesteros-Paredes J, Inutsuka SI, Adamo A, Hennebelle P.   +8 more
europepmc   +8 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.
Sills, Alison, Wadsley, James, Ward, Rachel L.   +2 more
arxiv   +6 more sources

Isotopic evidence for primordial molecular cloud material in metal-rich carbonaceous chondrites. [PDF]

Proc Natl Acad Sci U S A, 2016
Significance Comets are pristine, volatile-rich objects formed beyond the orbits of the gas giants and, thus, thought to preserve a record of the primordial molecular cloud material parental to our Solar System.
Van Kooten EM, Wielandt D, Schiller M, Nagashima K, Thomen A, Larsen KK, Olsen MB, Nordlund Å, Krot AN, Bizzarro M.   +9 more
europepmc   +2 more sources

[Cii] emission from L1630 in the Orion B molecular cloud. [PDF]

Astron Astrophys, 2017
CONTEXT L1630 in the Orion B molecular cloud, which includes the iconic Horsehead Nebula, illuminated by the star system σ Ori, is an example of a photodissociation region (PDR). In PDRs, stellar radiation impinges on the surface of dense material, often
Pabst CHM, Goicoechea JR, Teyssier D, Berné O, Ochsendorf BB, Wolfire MG, Higgins RD, Riquelme D, Risacher C, Pety J, Le Petit F, Roueff E, Bron E, Tielens AGGM.   +13 more
europepmc   +3 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, Patrick Hennebelle, Edith Falgarone   +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 ...
N. Z. Scoville, P. M. Solomon
openalex   +6 more sources

Possibilities for Methanogenic and Acetogenic Life in Molecular Clouds [PDF]

Life
According to panspermia, life on Earth may have originated from life forms transported through space from elsewhere. These life forms could have passed through molecular clouds, where the process of methanogenesis could have provided enough energy to ...
Lei Feng
doaj   +2 more sources

Filament L1482 in the California molecular cloud [PDF]

, 2014
Aims. The process of gravitational fragmentation in the L1482 molecular filament of the California molecular cloud is studied by combining several complementary observations and physical estimates.
Esimbek, Jarken, He, Yu-Xin, Li, Da-Lei, Lou, Yu-Qing, Tang, Xin-Di, Wu, Gang, Zhou, Jian-Jun   +6 more
core   +2 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, R. D. Cook, Y.-H. Lin, Y.-H. Lin, Y.-H. Lin, Y.-H. Lin, Z. Peng, Z. Peng, E. Boone, E. Boone, R. K. Chu, J. E. Dukett, M. J. Gunsch, W. Zhang, W. Zhang, N. Tolic, A. Laskin, A. Laskin, K. A. Pratt, K. A. Pratt   +19 more
doaj   +2 more sources

Angular Momentum in Giant Molecular Clouds. I. The Milky Way [PDF]

, 2011
We present a detailed analysis comparing the velocity fields in molecular clouds and the atomic gas that surrounds them in order to address the origin of the gradients. To that end, we present first-moment intensity-weighted velocity maps of the molecular clouds and surrounding atomic gas. The maps are made from high-resolution 13CO observations and 21-
Blitz, Blitz, Blitz, Burkert, Burkert, Carpenter, Castets, Celnik, Crutcher, de Zeeuw, Elmegreen, Engargiola, Falgarone, Flaccomio, Furész, Heiles, Heyer, Kim, Kuchar, Leo Blitz, Mestel, Mizuno, Mouschovias, Nagahama, Nia Imara, Ramírez, Rosolowsky, Sagar, Sancisi   +28 more
arxiv   +3 more sources