Results 21 to 30 of about 138,438 (330)

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, Izaskun Jiménez-Serra, Jesús Martín-Pintado, Laura Colzi, Belén Tercero, Pablo de Vicente, Shaoshan Zeng, Sergio Martín, Sergio Martín, Juan García de la Concepción, Luca Bizzocchi, Mattia Melosso, Mattia Melosso, Fernando Rico-Villas, Miguel A. Requena-Torres, Miguel A. Requena-Torres   +15 more
doaj   +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, Yao Huang, Sheng Zheng, Zhi-Wei Chen, Xiang-Yun Zeng, Xiao-Yu Luo, Chen Long   +6 more
doaj   +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, Kazi L.J. Rygl, Pascal Tremblin, Tracey Hill, Quang Nguyen-Luong, Vera Könyves, P. Palmeirim, Stefano Pezzuto, Eugenio Schisano, Luigi Spinoglio, A. Rivera-Ingraham, A. Rivera-Ingraham, Doris Arzoumanian, Ph. André, Sergio Molinari, Derek Ward-Thompson, Frédérique Motte, A. M. di Giorgio, A. Roy, J. Di Francesco, J. Di Francesco, Nicola Schneider, Glenn J. White, M. Benedettini   +23 more
openaire   +9 more sources

A Herschel [C II] Galactic plane survey II: CO-dark H2 in clouds [PDF]

, 2014
ABRIDGED: Context: HI and CO large scale surveys of the Milky Way trace the diffuse atomic clouds and the dense shielded regions of molecular hydrogen clouds.
Goldsmith, P. F., Langer, W. D., Pineda, J. L., Velusamy, T., Willacy, K.   +4 more
core   +1 more source

Chiral and Molecular Recognition through Protonation between Aromatic Amino Acids and Tripeptides Probed by Collision-Activated Dissociation in the Gas Phase

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, Hikaru Inoue, Masanobu Sogi, Michiko Tajiri, Yoshinao Wada   +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, Timo Prusti, Rene J. Laureijs   +2 more
openaire   +2 more sources

The Global Evolution of Giant Molecular Clouds II: The Role of Accretion [PDF]

, 2011
We present virial models for the global evolution of giant molecular clouds. Focusing on the presence of an accretion flow, and accounting for the amount of mass, momentum, and energy supplied by accretion and star formation feedback, we are able to ...
Abdo, Ballesteros-Paredes, Ballesteros-Paredes, Bigiel, Blitz, Bolatto, Christopher D. Matzner, Christopher F. McKee, Dickel, Engargiola, Evans, Fall, Fukui, Glover, Heiles, Heyer, Heyer, Heyer, Hughes, Imara, Kawamura, Kegel, Kennicutt, Kim, Kim, Kim, Krumholz, Krumholz, Krumholz, Krumholz, Krumholz, Krumholz, Lada, Larson, Leroy, Leroy, Li, Li, Li, Li, Lopez, Mark R. Krumholz, Matzner, Matzner, Matzner, McKee, McKee, McKee, Meynet, Mizuno, Murray, Nathan J. Goldbaum, Onodera, Parravano, Roman-Duval, Rosolowsky, Schaerer, Schlegel, Schruba, Schruba, Stark, Stone, Strong, Tamburro, Tan, Tan, Tasker, Tasker, Thilker, Troland, Vazquez-Semadeni, Vázquez-Semadeni, Wang, Wang, Williams, Wise, Wolfire, Wong, Wong, Yang   +79 more
core   +2 more sources

Spiral arm triggering of star formation [PDF]

, 2006
We present numerical simulations of the passage of clumpy gas through a galactic spiral shock, the subsequent formation of giant molecular clouds (GMCs) and the triggering of star formation.
Clare L. Dobbs, Ian A. Bonnell, Motte
core   +2 more sources

ON THE THEORY OF THE OF-CENTRAL EXPLOSION IN A SPHERICALLY STRATIFIED MEDIUM

Radio Physics and Radio Astronomy, 2015
Аn analytical solution for a spherically stratified medium is constructed on the strength of an earlier obtained exact solution of Kompaneets equation for the shock front in a planar stratified medium with the density changing as the hyperbolic tangent ...
G. V. Donets
doaj   +1 more source

Chemistry of Molecular Clouds [PDF]

International Astronomical Union Colloquium, 1989
AbstractA discussion is presented of the chemistry of quiescent molecular clouds, and the effects of the presence of polycyclic aromatic hydrocarbon molecules and of cosmic-ray induced ultraviolet photons are examined. A comparison is made with the chemistry occurring in molecular clouds that are subjected to shocks and the differences between ...
openaire   +2 more sources