Results 1 to 10 of about 234,759 (330)

Chemodynamic evolution of dwarf galaxies in tidal fields [PDF]

, 2016
The mass-metallicity relation shows that the galaxies with the lowest mass have the lowest metallicities. As most dwarf galaxies are in group environments, interaction effects such as tides could contribute to this trend.
Martel, Hugo, Romeo, Alessandro B., Williamson, David   +2 more
core   +2 more sources

Radii of 88 M subdwarfs and updated radius relations for low-metallicity M-dwarf stars [PDF]

, 2018
M subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller ...
Boeshaar, Patricia C., Calchi-Novati, Sebastiano, Cushing, Michael C., Davy Kirkpatrick, J., Fajardo-Acosta, Sergio B., Henderson, Calen B., Kesseli, Aurora Y., Muirhead, Philip S., Penny, Matthew T., Scott Gaudi, B., Shvartzvald, Y., Veyette, Mark   +11 more
core   +5 more sources

An empirical prediction for stellar metallicity distributions in nearby galaxies

, 2012
We combine star-formation histories derived from observations of high redshift galaxies with measurements of the z~0 relation between gas-phase metallicity, stellar mass, and star formation rate to make an explicit and completely empirical connection ...
Allende Prieto, Arrigoni, Asplund, Behroozi, Bensby, Bland-Hawthorn, Bouché, Brinchmann, Brooks, Brooks, Bruzual, Chabrier, Colavitti, Conroy, Daddi, Davé, Davé, Dayal, De Lucia, De Lucia, Delahaye, Dolphin, Eisenstein, Elbaz, Ellison, Ellison, Erb, Finlator, Fontanot, Gallazzi, Gallazzi, Garnett, Hirschmann, Hughes, Ivezić, Karim, Kewley, Kewley, Kimm, Kirby, Kirby, Kirby, Klypin, Kobayashi, Kobulnicky, Kormendy, Lara-López, Leitner, Leitner, Lopez-Sanchez, Lynden-Bell, Maiolino, Mannucci, Mannucci, Molly S. Peeples, Moster, Mouhcine, Nagashima, Nicholls, Noeske, Oliver, Oppenheimer, Pagel, Pasquali, Pasquali, Peeples, Rachel S. Somerville, Robaina, Salim, Savaglio, Scannapieco, Shapley, Skelton, Somerville, Sommariva, Spitoni, Thomas, Tinsley, Tinsley, Tissera, Toomre, Trager, Tremonti, Tumlinson, Weisz, Wiersma, Woo, Yabe, Yates, Zahid, Zahid, Zaritsky, Zheng   +92 more
core   +1 more source

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

On the sizes of z>2 Damped Lyman-alpha Absorbing Galaxies

, 2012
Recently, the number of detected galaxy counterparts of z > 2 Damped Lyman-alpha Absorbers in QSO spectra has increased substantially so that we today have a sample of 10 detections. M{\o}ller et al.
B. Milvang-Jensen, Bouché, Briggs, C. Ledoux, Cen, Christensen, Cooke, Dijkstra, Ellison, Ellison, Ferguson, Foltz, Fynbo, Fynbo, Fynbo, Gardner, Haehnelt, Hunstead, J. P. U. Fynbo, J.-K. Krogager, Khare, L. Christensen, Ledoux, Ledoux, M. Sparre, Monier, Møller, Møller, Møller, Nagamine, Noterdaeme, P. Møller, P. Noterdaeme, Pei, Pontzen, Prochaska, Péroux, Razoumov, Rees, Smette, Smith, Tyson, Weatherley, Wolfe, Wolfe, Wolfe   +45 more
core   +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

Metallicity Gradients and Gas Flows in Galaxy Pairs

, 2010
We present the first systematic investigation into the metallicity gradients in galaxy close pairs. We determine the metallicity gradients for 8 galaxies in close pairs using HII region metallicities obtained with high signal-to-noise multi-slit ...
Barnes, Barton, Barton Gillespie, Bastian, Bresolin, Chien, Ellison, Hopkins, Iono, Kennicutt, Kewley, Kewley, Kewley, Kobulnicky, Lee, Martin, Montuori, Moustakas, Narayanan, Peeples, Rupke, Rupke, Rupke, Rupke, Sakamoto, Shaver, Sheth, Spergel, Springel, Trancho, Woods   +30 more
core   +1 more source

Ultra-faint dwarf galaxies as a test of early enrichment and metallicity-dependent star formation

, 2011
The tight relation of star formation with molecular gas indicated by observations and assumed in recent models implies that the efficiency with which galaxies convert their gas into stars depends on gas metallicity.
Andrey V. Kravtsov, Aykutalp, Bigiel, Bigiel, Bolatto, Brooks, Carrera, Chen, Dalcanton, Gnedin, Gnedin, Gnedin, Gnedin, Helmi, Kalirai, Karlsson, Kirby, Komatsu, Konstantinos Tassis, Kravtsov, Kravtsov, Krumholz, Krumholz, Krumholz, Krumholz, Kuhlen, Lee, Leroy, Nickolay Y. Gnedin, Ostriker, Prochaska, Rafelski, Rudd, Simon, Simon, Spaans, Tassis, Tassis, Tremonti, Wise, Wolfire, Wong, Wong, Zemp   +43 more
core   +1 more source

On the relation between sSFR and metallicity

, 2014
In this paper we present an exact general analytic expression $Z(sSFR)=y/\Lambda(sSFR)+I(sSFR)$ linking the gas metallicity Z to the specific star formation rate (sSFR), that validates and extends the approximate relation put forward by Lilly et al ...
Carollo, C. M., Lilly, S. J., Pipino, A.
core   +1 more source

The Chemical Enrichment History of the Large Magellanic Cloud

, 2007
Ca II triplet spectroscopy has been used to derive stellar metallicities for individual stars in four LMC fields situated at galactocentric distances of 3\arcdeg, 5\arcdeg, 6\arcdeg\@ and 8\arcdeg\@ to the north of the Bar.
A. Aparicio, Alves D. R., Aparicio A. & Gallart C., Bica E., C. Gallart, Carrera R., Cole A. A., Cole A. A., Dirsch B., Eduardo Hardy, Gallart C., Grocholski A. J., Hill V., Holtzman J. A., Koch A., Kontizas M., Maeder A., Nidever D. L., Pagel B. E. J. & Tautvaisiene G., Peimbert M., Pont F., R. Carrera, R. Zinn, Santos F. F. C., Scalo J. M., Sellwood J. A. & Wilkinson A., Tinsley B. M., Vallenari A., Westerlund B. E.   +28 more
core   +1 more source