Results 51 to 60 of about 25,277 (239)

Formation of Massive and Wide First-star Binaries in Radiation Hydrodynamic Simulations

The Astrophysical Journal, 2023
We study the formation of Population III stars by performing radiation hydrodynamic simulations for three different initial clouds extracted from cosmological hydrodynamic simulations.
Kazuyuki Sugimura, Tomoaki Matsumoto, Takashi Hosokawa, Shingo Hirano, Kazuyuki Omukai   +4 more
doaj   +1 more source

Gas dynamics in Massive Dense Cores in Cygnus-X [PDF]

, 2010
We study the kinematic properties of dense gas surrounding massive protostars recognized by Bontemps et a. (2010) in a sample of five Massive Dense Cores in Cygnus-X.
Bontemps, S., Csengeri, T., Dib, S., Motte, F., Schneider, N.   +4 more
core   +3 more sources

Hydrodynamic Modeling of the Interaction of Winds within a Collapsing Turbulent Gas Cloud

Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015
By using the particle‐based code Gadget2, we follow the evolution of a gas giant molecular cloud, in which a set of gas particles representing the wind are created by a Monte Carlo scheme and suddenly move outwards from the cloud’s center. The particles representing the gas cloud initially have a velocity according to a turbulent spectrum built in a ...
Guillermo Arreaga-García, Julio Saucedo-Morales, William Reach   +2 more
wiley   +1 more source

Physical structure of the envelopes of intermediate-mass protostars

, 2010
Context: Intermediate mass protostars provide a bridge between low- and high-mass protostars. Furthermore, they are an important component of the UV interstellar radiation field.
A. Fuente, Andre, Ayala, B. Lefloch, Bechis, Beltrán, Beltrán, Boogert, C. Ceccarelli, C. Kahane, Casali, Caux, Ceccarelli, Ceccarelli, Cesaroni, Chandler, Chini, Codella, Codella, Crimier, D. Johnstone, de Gregorio-Monsalvo, Di Francesco, Doty, Draine, E. van Dishoeck, Eiroa, Eiroa, Eislöffel, Evans, F. Wyrowski, Faure, Faure, Felli, Flower, Frerking, Froebrich, Fuente, Fuente, Fuente, Fuente, Fukui, Giovannetti, Gomez, Gondhalekar, Greve, Guesten, Habing, Hartigan, Harvey, Hatchell, Hennebelle, Herbst, Hillenbrand, Hodapp, Hogerheijde, Huard, Hurt, Ivezic, J. R. Rizzo, Jørgensen, Jørgensen, Jørgensen, Kaas, Krumholz, Ladd, Larsson, Larsson, Launhardt, Launhardt, Lefloch, Li, Lizano, M. Tafalla, Mannings, Mannings, Matthews, McKee, McLaughlin, McLaughlin, Miranda, Moro-Martín, Motte, Mueller, N. Crimier, Neri, Nisini, Noriega-Crespo, Osorio, Ossenkopf, Osterbrock, P. Caselli, Palla, Parise, Patel, R. Plume, Rodriguez, Rodriguez, S. Maret, Sandell, Saraceno, Schreyer, Schöier, Sellgren, Serabyn, Shevchenko, Shirley, Shu, Smith, Stahler, Strom, Strom, Sugitani, Sugitani, T. Alonso-Albi, Testi, Testi, Tofani, Troscompt, van der Tak, Van der Tak, Vastel, Visser, Wang, Weikard, White, Wilking, Williams, Williams, Wolf-Chase, Young, Yun, Yun   +132 more
core   +3 more sources

The JCMT Gould Belt Survey: A First Look at the Auriga–California Molecular Cloud with SCUBA-2 [PDF]

, 2018
We present 850 and 450 μm observations of the dense regions within the Auriga–California molecular cloud using SCUBA-2 as part of the JCMT Gould Belt Legacy Survey to identify candidate protostellar objects, measure the masses of their circumstellar ...
A. Chrysostomou, A. Duarte-Cabral, Andrews S. M., Andrews S. M., B. C. Matthews, Berry D. S., Broekhoven-Fiene H., C. D. Wilson, C. J. Davis, C. Mowat, C. Quinn, C. Salji, Chen M. C.-Y., D. Bresnahan, D. Johnstone, D. Nutter, D. Robertson, D. Rumble, D. S. Berry, D. Ward-Thompson, E. Drabek-Maunder, E. Rosolowsky, Evans N. J.II, G. A. Fuller, G. J. White, G. Joncas, G. Moriarty-Schieven, Gutermuth R. A., H. Broekhoven-Fiene, H. Butner, H. Kirk, H. Thomas, Harvey P. M., Harvey P. M., J. Buckle, J. C. Mottram, J. Di Francesco, J. E. Pineda, J. Fiege, J. Greaves, J. Gregson, J. Hatchell, J. Lane, J. M. Kirk, J. Rawlings, J. Richer, J. Wouterloot, J. Yates, K. Marsh, K. Pattle, L. B. G. Knee, Lada C. J., Lane J., M. Chen, M. Fich, M. J. Currie, M. R. Hogerheijde, M. Zhu, Mann R. K., Mann R. K., Mann R. K., Mann R. K., Markwardt C. B. ed Bohlender D. A., Megeath S. T., Mohanty S., N. Tothill, P. Bastien, P. Friberg, P. Harvey, R. Friesen, Robitaille T., S. Coude, S. Graves, S. Mairs, S. Sadavoy, S. Tisi, S. Viti, Sadavoy S. I., Sadavoy S. I., T. Jenness, W. Holland, Ward-Thompson D., Wolk S. J., Young C. H.   +83 more
core   +7 more sources

Physicochemical Constraints on the Abiotic Polymerization of Nucleotides Into RNA

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 11, November 2025.
Abstract One of the key steps in the origin of life is the polymerization of nucleotides into nucleic acids like RNA. We have quantified the energetic impact of temperature, pressure, and composition on the polymerization of nucleotides into RNA using the Gibbs function. These Gibbs energies have been used to calculate the probability that a nucleotide
D. E. LaRowe, J. M. Dick
wiley   +1 more source

A Hydrodynamical Model of a Rotating Wind Source and Its Effects on the Collapse of a Rotating Core

Advances in Astronomy, Volume 2015, Issue 1, 2015., 2015
This work presents three‐dimensional hydrodynamical simulations with the fully parallel GAGDET2 code, to model a rotating source that emits wind in order to study the subsequent dynamics of the wind in three independent scenarios. In the first scenario we consider several models of the wind source, which is characterized by a rotation velocity Vrot and
Guillermo Arreaga-Garcia, Elmetwally Elabbasy   +1 more
wiley   +1 more source

Rotational Spectroscopy of the Acetone‐Water Complex: Large Amplitude Motions

ChemPhysChem, Volume 25, Issue 21, November 4, 2024.
The structure and dynamics of the acetone‐water complex were explored using jet‐cooled rotational spectroscopy and computational chemistry calculations. Our detailed rot‐tunneling analyses of acetone‐H2O and −D2O revealed that the interaction with water disrupts the equivalence of the two methyl rotors, resulting in a significantly lower methyl rotor ...
Jiao Gao, Colton D. Carlson, Javix Thomas, Yunjie Xu, Wolfgang Jäger   +4 more
wiley   +1 more source

The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. II. A Statistical Characterization of Class 0 and Class I Protostellar Disks [PDF]

, 2020
We have conducted a survey of 328 protostars in the Orion molecular clouds with the Atacama Large Millimeter/submillimeter Array at 0.87 mm at a resolution of ~0.”1 (40 au), including observations with the Very Large Array at 9 mm toward 148 protostars ...
Furlan, Elise, Tobin, John J.
core  

High Resolution Near-Infrared Spectra of Protostars [PDF]

, 2000
We present new high resolution (R = 21,000) near-infrared (2 microns) spectroscopic observations of a sample of Class I and flat-spectrum protostellar objects in the rho Ophiuchi dark cloud.
Casali M. M., Charles J. Lada, D’Antona F., Thomas P. Greene   +3 more
core   +2 more sources