Results 31 to 40 of about 4,469,999 (359)
Molecular clouds in the Cosmic Snake normal star-forming galaxy 8 billion years ago [PDF]
Nature Astronomy, 2019 The cold molecular gas in contemporary galaxies is structured in discrete cloud complexes. These giant molecular clouds (GMCs), with 104–107 solar masses (M⊙) and radii of 5–100 parsecs, are the seeds of star formation1.
M. Dessauges-Zavadsky +14 more
semanticscholar +1 more source
Molecular-Clump Detection Based on an Improved YOLOv5 Joint Density Peak Clustering
Universe, 2023 The detection and analysis of molecular clumps can lead to a better understanding of star formation in the Milky Way. Herein, we present a molecular-clump-detection method based on improved YOLOv5 joint Density Peak Clustering (DPC). The method employs a
Jin-Bo Hu +6 more
doaj +1 more source
Modeling UV Radiation Feedback from Massive Stars. II. Dispersal of Star-forming Giant Molecular Clouds by Photoionization and Radiation Pressure [PDF]
, 2018 UV radiation feedback from young massive stars plays a key role in the evolution of giant molecular clouds (GMCs) by photoevaporating and ejecting the surrounding gas.
Jeong-Gyu Kim +2 more
semanticscholar +1 more source
Star Formation Rates of Massive Molecular Clouds in the Central Molecular Zone [PDF]
Astrophysical Journal, 2019 We investigate star formation at very early evolutionary phases in five massive clouds in the inner 500 pc of the Galaxy, the Central Molecular Zone (CMZ).
Xing 行 Lu 吕 +10 more
semanticscholar +1 more source
Study the Effect of Perturbation in the Evolution of the Filamentary Molecular Clouds [PDF]
Iranian Journal of Astronomy and Astrophysics, 2020 Observatory studies indicate that stars are caused by the collapse of dense molecular clouds, and thermal instability can be a factor in creating this collapse.
Maryam Mesgaran, Khodadad Kokabi
doaj +1 more source
Molecular Precursors of the RNA-World in Space: New Nitriles in the G+0.693−0.027 Molecular Cloud
Frontiers in Astronomy and Space Sciences, 2022 Nitriles play a key role as molecular precursors in prebiotic experiments based on the RNA-world scenario for the origin of life. These chemical compounds could have been partially delivered to the young Earth from extraterrestrial objects, stressing the
Víctor M. Rivilla +15 more
doaj +1 more source
Distances to molecular clouds at high galactic latitudes based on Gaia DR2 [PDF]
Astronomy & Astrophysics, 2019 We report the distances of molecular clouds at high Galactic latitudes (|b| > 10°) derived from parallax and G-band extinction (AG) measurements in the second Gaia data release, Gaia DR2. Aided by Bayesian analyses, we determined distances by identifying
Q. Yan +6 more
semanticscholar +1 more source
Filaments in the Lupus molecular clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 We have studied the filaments extracted from the column density maps of the nearby Lupus 1, 3, and 4 molecular clouds, derived from photometric maps observed with the Herschel satellite. Filaments in the Lupus clouds have quite low column densities, with a median value of $\sim$1.5$\times$10$^{21}$ cm$^{-2}$ and most have masses per unit length lower ...
Davide Elia +23 more
openaire +8 more sources
Molecules, 2018 Chiral and molecular recognition through protonation was investigated through the collision-activated dissociation (CAD) of protonated noncovalent complexes of aromatic amino acid enantiomers with l-alanine- and l-serine-containing tripeptides using a ...
Akimasa Fujihara +4 more
doaj +1 more source
Fragmentation in molecular clouds [PDF]
Symposium - International Astronomical Union, 1991 B209. Fragments are detected in the outer parts of the B209 molecular cloud in a region of density 1000 cm−3 using 12CO, 13CO, H2CO, IRAS 60 and 100 μm images, discernable as velocity components, and have characteristics: <Rfragment>∼ 0.4 pc; <Mfragment>∼ 2 M⊙; <MVRfragment>∼ 1.6 M⊙ km/s pc; Tgas ∼ 11 K; Tdust> ∼ 16 K??. The system
Frank O. Clark +2 more
openaire +2 more sources