Results 31 to 40 of about 52,634 (236)

The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants

The Astrophysical Journal
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [ Z ] =
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin, Lucas M. Macri, Wenlong Yuan, Siyang Li, Gagandeep S. Anand, Adam G. Riess   +7 more
doaj   +1 more source

Exploring the Gas-phase Metallicity Gradients of Star-forming Galaxies at Cosmic Noon

The Astrophysical Journal
We explore the relationships between the [O/H] gas-phase metallicity radial gradients and multiple galaxy properties for 238 star-forming galaxies at 0.6 < z < 2.6 selected from the CANDELS Ly α Emission at Reionization survey with stellar mass $8.5\lt ...
Yingjie Cheng, Mauro Giavalisco, Raymond C. Simons, Zhiyuan Ji, Darren Stroupe, Nikko J. Cleri   +5 more
doaj   +1 more source

Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a “Radical + Ice” Mechanism

ChemPlusChem, EarlyView.
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 ...
Jessica Perrero, Stefano Pantaleone, Piero Ugliengo, Albert Rimola   +3 more
wiley   +1 more source

The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra

, 2007
We have derived the oxygen abundance for a sample of nearby galaxies in the Data Release 5 of the Sloan Digital Sky Survey (SDSS) which possess at least two independent spectra of one or several HII regions with a detected [OIII]4363 auroral line. Since,
Campbell A., Edmunds M. G., Kinkel U., Leonid S. Pilyugin, Luridiana V., Pagel B. E. J., Pagel B. E. J., Pagel B. E. J., Pilyugin L. S., Pilyugin L. S., Trinh X. Thuan   +10 more
core   +1 more source

Exploring the Evolution of Massive Clumps in Simulations That Reproduce the Observed Milky Way α-element Abundance Bimodality

The Astrophysical Journal, 2023
The Milky Way (MW) stellar disk has both a thin and a thick component. The thin disk is composed mostly of younger stars (≲8 Gyr) with a lower abundance of α -elements, while the thick disk contains predominantly older stars (≳8–12 Gyr) with a higher α ...
Bethany R. Garver, David L. Nidever, Victor P. Debattista, Leandro Beraldo e Silva, Tigran Khachaturyants   +4 more
doaj   +1 more source

Adverse Outcome Pathways Applied to Space Radiation Research

Environmental and Molecular Mutagenesis, EarlyView.
ABSTRACT Long‐duration spaceflight exposes astronauts to various stressors that can alter human physiology, potentially causing immediate and long‐term health effects. These stressors can damage biomolecules, cells, tissues, and organs, leading to adverse outcomes.
Vinita Chauhan, Veronica S. Grybas, Devyn Hoopfer, Casey Higginson, Elizabeth A. Ainsbury, Omid Azimzadeh, Afshin Beheshti, Steve Blattnig, Marjan Boerma, Sylvain V. Costes, Stephen Doty, Christelle Adam‐Guillermin, Nobuyuki Hamada, Patricia Hinton, Janice L. Huff, Robert Reynolds, Ruth C. Wilkins, Scott Wood, Carole L. Yauk   +18 more
wiley   +1 more source

Nucleosynthesis: Stellar and Solar Abundances and Atomic Data [PDF]

, 2006
Abundance observations indicate the presence of often surprisingly large amounts of neutron capture (i.e., s- and r-process) elements in old Galactic halo and globular cluster stars.
Collier, Jason, Cowan, John J., DenHartog, E. A., Dodge, Homer L., Lawler, James E., Sneden, Christopher   +5 more
core   +4 more sources

Breaks in surface brightness profiles and radial abundance gradients in the discs of spiral galaxies

, 2017
We examine the relation between breaks in the surface brightness profiles and radial abundance gradients within the optical radius in the discs of 134 spiral galaxies from the CALIFA survey. The distribution of the radial abundance (in logarithmic scale)
Grebel, E. K, Nefedyev, Y. A., Pilyugin, L. S., Vilchez, J. M., Zinchenko, I. A.   +4 more
core   +1 more source

Non-LTE abundances of Mg and K in extremely metal-poor stars and the evolution of [O/Mg], [Na/Mg], [Al/Mg] and [K/Mg] in the Milky Way [PDF]

, 2010
LTE abundances of light elements in extremely metal-poor (EMP) stars have been previously derived from high quality spectra. New derivations, free from the NLTE effects, will better constrain the models of the Galactic chemical evolution and the yields ...
Andrievsky, S. M., Bonifacio, P., Cayrel, R., François, P., Hill, V., Korotin, S. A., Spite, F., Spite, Monique   +7 more
core   +5 more sources

Fermentation of Soy Juice by Lactiplantibacillus plantarum CIRM‐BIA777 Produces Flavor‐Related and Health‐Promoting Metabolites

Food Frontiers, EarlyView.
Transcriptomics revealed the metabolism of Lactiplantibacillus plantarum during soy milk fermentation. The fermentation of soy milk released aroma compounds and health‐beneficial metabolites. ABSTRACT The fermentation of plant‐based beverages, such as organic and locally produced soy juice (SJ), offers a sustainable way to develop dairy alternatives ...
Olivier Harlé, Sandrine Parayre, Marie‐Bernadette Maillard, Gwenaële Henry, Éric Guédon, Anne Thierry, Jérôme Niay, Stéphanie‐Marie Deutsch, Hélène Falentin   +8 more
wiley   +1 more source