Results 41 to 50 of about 241,989 (335)

Cooling Flows and Metallicity Gradients in Clusters of Galaxies [PDF]

, 1995
The X-ray emission by hot gas at the centers of clusters of galaxies is commonly modeled assuming the existence of steady-state, inhomogeneous cooling flows. We derive the metallicity profiles of the intracluster medium expected from such models.
Allen S. W., Andreas Reisenegger,, Carollo C. M., Dickens R. J., Edge A. C., Eli Waxman, Fukazawa Y., Johnstone R. M., Jordi Miralda-Escudé,, Lucey J. R., Miller L., Nulsen P. E. J., Pringle J. E., Tabor G., Tanaka Y., Thomas P. A.   +15 more
core   +2 more sources

Impacts of Radial Mixing on the Galactic Thick and Thin Disks

, 2017
Using N-body simulations of the Galactic disks, we qualitatively study how the metallicity distributions of the thick and thin disk stars are modified by radial mixing induced by the bar and spiral arms.
Kawata, Daisuke
core   +1 more source

Core to Cosmic Edge: SIMBA-C’s New Take on Abundance Profiles in the Intragroup Medium at z = 0

Universe
We employ the simba-c cosmological simulation to study the impact of its upgraded chemical enrichment model (Chem5) on the distribution of metals in the intragroup medium (IGrM).
Aviv Padawer-Blatt, Zhiwei Shao, Renier T. Hough, Douglas Rennehan, Ruxin Barré, Vida Saeedzadeh, Arif Babul, Romeel Davé, Chiaki Kobayashi, Weiguang Cui, François Mernier, Ghassem Gozaliasl   +11 more
doaj   +1 more source

CRITICAL METALLICITY FOR POPULATION II STARS

Odessa Astronomical Publications, 2008
We present simple arguments about metallicity of transition from first stellar generation (population III) to the second one. We consider the efficiency of fragmentation in gas induced by thermal instability in cold gas layers and filaments (T < 104 K ...
E. O. Vasiliev, Yu. A. Shchekinov
doaj   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur, Faruk Kaya, Bora Derin, Mustafa Lütfi Öveçoğlu, Ju Li, Duygu Ağaoğulları   +5 more
wiley   +1 more source

The Star Formation History of the Milky Way’s Nuclear Star Cluster

The Astrophysical Journal, 2023
We report the first star formation history study of the Milky Ways nuclear star cluster (NSC), which includes observational constraints from a large sample of stellar metallicity measurements.
Zhuo Chen, Tuan Do, Andrea M. Ghez, Matthew W. Hosek Jr., Anja Feldmeier-Krause, Devin S. Chu, Rory O. Bentley, Jessica R. Lu, Mark R. Morris   +8 more
doaj   +1 more source

Cosmological Implications of the Second Parameter of Type Ia Supernovae [PDF]

, 2006
Theoretical models predict that the initial metallicity of the progenitor of a Type Ia supernova (SN Ia) affects the peak of the supernova light curve.
Forster, Francisco, Lesaffre, Pierre, Mazzali, Paolo A., Podsiadlowski, Philipp, Wolf, Christian   +4 more
core   +1 more source

Gas metallicity diagnostics in star-forming galaxies

, 2006
Generally the gas metallicity in distant galaxies can only be inferred by using a few prominent emission lines. Various theoretical models have been used to predict the relationship between emission line fluxes and metallicity, suggesting that some line ...
A. Marconi, Abazajian, Abazajian, Adelman-McCarthy, Allende Prieto, Alloin, Alvensleben, Bresolin, Brinchmann, Bruzual, Cardelli, Castellanos, Charlot, Denicoló, Edmunds, Ferland, Ferland, Fioc, Guseva, Guseva, Guseva, Guseva, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Kauffmann, Kauffmann, Kennicutt, Kennicutt, Kennicutt, Kewley, Kewley, Kobulnicky, Kobulnicky, Lamareille, Lee, Lee, Lee, Leitherer, Liang, Maier, Maier, McCall, McGaugh, Melbourne, Miller, Nagao, Nagao, Pagel, Pagel, Papaderos, Peimbert, Pettini, Pettini, Pilyugin, Posselt, R. Maiolino, Rola, Shi, Stasinska, Strauss, Sutherland, Swinbank, T. Nagao, Teplitz, Teplitz, Thuan, Tremonti, Vílchez, Zaritsky   +73 more
core   +1 more source

Revisiting Stability Criteria in Ball‐Milled High‐Entropy Alloys: Do Hume–Rothery and Thermodynamic Rules Equally Apply?

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
The stability criteria affecting the formation of high‐entropy alloys, particularly focusing in supersaturated solid solutions produced by mechanical alloying, are analyzed. Criteria based on Hume–Rothery rules are distinguished from those derived from thermodynamic relations. The formers are generally applicable to mechanically alloyed samples.
Javier S. Blázquez, Alejandro F. Manchón‐Gordón, Antonio Vidal‐Crespo, Rafael Caballero‐Flores, Jhon J. Ipus, Clara F. Conde   +5 more
wiley   +1 more source

Oxygen Metallicity Determinations from Optical Emission Lines in Early-type Galaxies

, 2009
We measured the oxygen abundances of the warm (T$\sim 10^{4}K$) phase of gas in seven early-type galaxies through long-slit observations. A template spectra was constructed from galaxies void of warm gas and subtracted from the emission-line galaxies ...
Aaronson, Alex E. Athey, Allen, Allen, Allen, Asplund, Athey, Barth, Binette, Bregman, Brown, Caon, Cappellaro, Cowie, de Vaucouleurs, Fabian, Filippenko, Fosbury, Garnett, Goudfrooij, Goudfrooij, Goudfrooij, Goudfrooij, Goudfrooij, Goudfrooij, Heckman, Heckman, Howell, Humphrey, Joel N. Bregman, Johnstone, Kobulnicky, Lequeux, Mayall, Osterbrock, Pagel, Parriott, Sadler, Schlegel, Scott, Silge, Singh, Temi, Thomas, Trager, Trager, Trinchieri, Veron-Cetty   +47 more
core   +1 more source