Results 61 to 70 of about 699,213 (384)

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

A SUPER-SOLAR METALLICITY FOR STARS WITH HOT ROCKY EXOPLANETS [PDF]

, 2016
Host star metallicity provides a measure of the conditions in protoplanetary disks at the time of planet formation. Using a sample of over 20,000 Kepler stars with spectroscopic metallicities from the LAMOST survey, we explore how the exoplanet ...
G. Mulders, I. Pascucci, D. Apai, A. Frasca, J. Molenda–Żakowicz   +4 more
semanticscholar   +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

Extremely metal-poor stars in SDSS fields [PDF]

, 2011
Some insight on the first generation of stars can be obtained from the chemical composition of their direct descendants, extremely metal-poor stars (EMP), with metallicity less than or equal to 1/1000 of the solar metalllicity. Such stars are exceedingly
Adelman-McCarthy, Barklem, Behara, Bonifacio, Bonifacio, Caffau, Carney, Castelli, Castelli, Cayrel, Cohen, Edvardsson, François, Kurucz, Lai, Ludwig, Ludwig, Marigo, Mashonkina, Nissen, Piau, Robin, Sbordone, Sbordone, Sbordone, Schlegel, Spite, Spite, Stehlé, Tafelmeyer, Tolstoy, York   +31 more
core   +6 more sources

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

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

The origin and evolution of the galaxy mass–metallicity relation [PDF]

, 2015
We use high-resolution cosmological zoom-in simulations from the Feedback in Realistic Environment (FIRE) project to study the galaxy mass–metallicity relations (MZR) from z=0–6.
Xiangcheng Ma, P. Hopkins, C. Faucher-Giguére, Nick Zolman, A. Muratov, D. Keres̆, Eliot Quataert Caltech, Northwestern, Ucsd, Uc Berkeley   +9 more
semanticscholar   +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

On The Origin Of The Mass-Metallicity Relation For GRB Host Galaxies

, 2010
We investigate the nature of the mass-metallicity (M-Z) relation for long gamma-ray burst (LGRB) host galaxies. Recent studies suggest that the M-Z relation for local LGRB host galaxies may be systematically offset towards lower metallicities relative to
/Boston U., Dept. Astron., /KIPAC, Menlo Park, Kocevski, Daniel, West, Andrew A.   +3 more
core   +2 more sources

The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets [PDF]

, 2018
Probing the connection between a star's metallicity and the presence and properties of any associated planets offers an observational link between conditions during the epoch of planet formation and mature planetary systems. We explore this connection by
Fulton, Benjamin J., Howard, Andrew W., Isaacson, Howard, Johnson, John Asher, Marcy, Geoffrey W., Morton, Timothy D., Petigura, Erik A., Sinukoff, Evan, Weiss, Lauren M., Winn, Joshua N.   +9 more
core   +3 more sources