Results 11 to 20 of about 25,277 (239)

Searching for Molecular Jets from High-mass Protostars [PDF]

The Astrophysical Journal Supplement Series, 2023
We report Very Large Array observations in the Q band toward 10 ionized jet candidates to search for SiO emission, a well-known shocked gas tracer. We detected 7 mm continuum counterparts toward 90% of the jet candidates. In most cases, the jet candidate
Tatiana M. Rodríguez, Peter Hofner, Isaac Edelman, Esteban D. Araya, Viviana Rosero   +4 more
doaj   +2 more sources

The Protostars in Orion: Characterizing the Properties of Their Magnetized Envelopes

The Astrophysical Journal
We present a study connecting the physical properties of protostellar envelopes to the morphology of the envelope-scale magnetic field. We used the Atacama Large Millimeter/submillimeter Array (ALMA) polarization observations of 61 young protostars at 0 ...
Bo Huang, Josep M. Girart, Ian W. Stephens, Manuel Fernández López, Philip C. Myers, Qizhou Zhang, John J. Tobin, Paulo Cortes, Nadia M. Murillo, Sarah Sadavoy, Hector G. Arce, John M. Carpenter, Woojin Kwon, Valentin J. M. Le Gouellec, Zhi-Yun Li, Leslie W. Looney, Tom Megeath, Erin G. Cox, Nicole Karnath, Dominique Segura-Cox   +19 more
doaj   +2 more sources

Gamma-rays from massive protostars [PDF]

, 2009
Fil: Paredes, Josep Maria. Universidad de Barcelona.
Romero, Gustavo Esteban, Araudo, Anabella Teresa, Bosch Ramon, Valentí, Paredes, Josep Maria   +3 more
openaire   +6 more sources

Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a "Radical + Ice" Mechanism. [PDF]

Chempluschem
The presence of interstellar complex organic molecules (COMs) has been baffling astrochemists for a long time. Methyl formate and glycolaldehyde are widely detected but their abundances mismatch kinetic astrochemical model predictions. Here, the formation of these two COMs is characterized onto a mixed ice surface, highlighting the importance of ...
Perrero J, Pantaleone S, Ugliengo P, Rimola A.   +3 more
europepmc   +2 more sources

Kinetics of the tautomerization of thioimidic acids R−C(SH)NH → R−C(S)NH2: For R = H, F, HO, CN, NC, H2N, HC(O), HC(S), HC≡ C, CH3, CF3, H2C=CH, HOCH2, H2NCH2,CH3C(O), C2H5, (CH3)2CH, C6H5

International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023
Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley   +1 more source

Bulk mineralogy, water abundance, and hydrogen isotope composition of unequilibrated ordinary chondrites

Meteoritics &Planetary Science, Volume 58, Issue 9, Page 1365-1381, September 2023., 2023
Abstract The origin and transport of water in the early Solar System is an important topic in both astrophysics and planetary science, with applications to protosolar disk evolution, planetary formation, and astrobiology. Of particular interest for understanding primordial water transport are the unequilibrated ordinary chondrites (UOCs), which have ...
Helen Grant, Romain Tartèse, Rhian Jones, Laurette Piani, Yves Marrocchi, Ashley King, Thomas Rigaudier   +6 more
wiley   +1 more source

Loading of Amino Acids onto RNA in a Putative RNA‐Peptide World

Angewandte Chemie International Edition, Volume 62, Issue 21, May 15, 2023., 2023
The loading of RNAs with amino acids constitutes the first step toward RNA‐based peptide synthesis in a putative prebiotic RNA‐peptide world. The efficient loading of RNA strands incorporating N‐methylcarbamoyl nucleotides with a series of amino acids is reported. The loaded RNA strands also underwent RNA‐based amino acid transfer reactions.
Johannes N. Singer, Felix M. Müller, Ewa Węgrzyn, Christina Hölzl, Hans Hurmiz, Chuyi Liu, Luis Escobar, Thomas Carell   +7 more
wiley   +1 more source

The grain size distribution of matrix in primitive chondrites

Meteoritics &Planetary Science, Volume 58, Issue 5, Page 688-704, May 2023., 2023
Abstract The matrix of primitive chondrites is composed of submicron crystals embedded in amorphous silicates. These grains are thought to be the remains of relatively unprocessed dust from the inner regions of the protoplanetary disk. The matrix of primitive meteorites is often compared to chondritic porous interplanetary dust particles (CP‐IDPs ...
E. Vaccaro, P. Wozniakiewicz, I. A. Franchi, N. Starkey, S. S. Russell   +4 more
wiley   +1 more source

Lifetime of the Outer Solar System Nebula From Carbonaceous Chondrites

Journal of Geophysical Research: Planets, Volume 127, Issue 7, July 2022., 2022
Abstract The evolution and lifetime of protoplanetary disks (PPDs) play a central role in the formation and architecture of planetary systems. Astronomical observations suggest that PPDs evolve in two timescales, accreting onto the star for up to several million years (Myr) followed by gas dissipation within ≲1 Myr. Because solar nebula magnetic fields
Cauê S. Borlina, Benjamin P. Weiss, James F. J. Bryson, Philip J. Armitage   +3 more
wiley   +1 more source

[Retracted] Internet of Things System of Spatial Structure Sports Events Health Monitoring Based on Cloud Computing

Security and Communication Networks, Volume 2022, Issue 1, 2022., 2022
At present, the health monitoring system of world sports events uses the system's on‐site information or periodic test information to evaluate the health of the system. In order to make the data more accurate, the application of cloud computing is necessary.
Rui Feng, Ning Chang, Muhammad Arif
wiley   +1 more source