Results 51 to 60 of about 58,855 (236)

Galaxy chemical evolution models: The role of molecular gas formation [PDF]

, 2017
In our classical grid of multiphase chemical evolution models, star formation in the disc occurs in two steps: first, molecular gas forms, and then stars are created by cloud-cloud collisions or interactions of massive stars with the surrounding ...
Ascasibar, Yago, Díaz, Angeles I., Díaz, Ángeles I., Gibson, Brad K., Mollá, Mercedes   +4 more
core   +2 more sources

Strong He i Emission Lines in High N/O Galaxies at z ∼ 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?

The Astrophysical Journal
We present He i /H β flux and He/H abundance ratios in three James Webb Space Telescope galaxies with significant constraints on N/O abundance ratios, GS-NDG-9422, RXCJ2248-ID, and GLASS150008 at z ∼ 6 mostly with the spectroscopic coverage from He i λ ...
Hiroto Yanagisawa, Masami Ouchi, Kuria Watanabe, Akinori Matsumoto, Kimihiko Nakajima, Hidenobu Yajima, Kentaro Nagamine, Koh Takahashi, Minami Nakane, Nozomu Tominaga, Hiroya Umeda, Hajime Fukushima, Yuichi Harikane, Yuki Isobe, Yoshiaki Ono, Yi Xu, Yechi Zhang   +16 more
doaj   +1 more source

The mass-metallicity relation of tidal dwarf galaxies

, 2015
Dwarf galaxies generally follow a mass-metallicity (MZ) relation, where more massive objects retain a larger fraction of heavy elements. Young tidal dwarf galaxies (TDGs), born in the tidal tails produced by interacting gas-rich galaxies, have been ...
Kroupa, P., Ploeckinger, S., Recchi, S.
core   +1 more source

A model for the chemical evolution of the galaxy with refuses

Astrophysics and Space Science, 1994
11 pages (figures and table upon request), Tex, Ap.Spac.Sci. (in press)
Helio J. Rocha-Pinto, Helio J. Rocha-Pinto, Walter J. Maciel, L. I. Arany-Prado, L. I. Arany-Prado   +4 more
openaire   +3 more sources

Inside-out versus Upside-down: The Origin and Evolution of Metallicity Radial Gradients in FIRE Simulations of Milky Way-mass Galaxies and the Essential Role of Gas Mixing

The Astrophysical Journal
Within the Milky Way (MW), younger stellar populations exhibit steeper (more negative) metallicity radial gradients; the origin of this trend remains debated. The FIRE-2 cosmological simulations of MW-mass galaxies show the same trend as the MW, which in
Russell L. Graf, Andrew Wetzel, Jeremy Bailin, Matthew E. Orr   +3 more
doaj   +1 more source

Chemical evolution of local galaxies

, 2022
We show the results of a study using the spectral synthesis technique study to measure the chemical evolution of local galaxies. The main parameters measured are the chemical enrichment history (ChEH) and the evolution of the stellar mass-metallicity relation (MZR) over cosmic time.
Artemi Camps Fariña, Patricia Sánchez Blázquez, Sebastián F. Sánchez   +2 more
openaire   +1 more source

Galactic and Cosmic Chemical Evolution with Hypernovae

, 2005
We provide new nucleosynthesis yields depending on metallicity and energy (i.e., (normal supernovae and hypernovae), and show the evolution of heavy element abundances from C to Zn in the solar neighborhood.
Kobayashi, Chiaki
core   +1 more source

Energetic constraints to chemo-photometric evolution of spiral galaxies [PDF]

, 2011
The problem of chemo-photometric evolution of late-type galaxies is dealt with relying on prime physical arguments of energetic self-consistency between chemical enhancement of galaxy mass, through nuclear processing inside stars, and luminosity ...
Alberto Buzzoni, Alibés, Arimoto, Arimoto, Arimoto, Arimoto, Baade, Barnes, Beers, Beers, Bessell, Blanton, Boissier, Boissier, Boselli, Brandt, Buzzoni, Buzzoni, Buzzoni, Buzzoni, Calzetti, Carigi, Carlberg, Carraro, Casagrande, Cayrel, Cellone, Chevalier, Chiappini, Clayton, Clegg, Cooper, Cowie, Dahlen, Dallaporta, de Vaucouleurs, Dopita, Dressler, Edvardsson, Ferrini, Firmani, Flynn, Friel, Fukugita, Garcia, Garnett, Gavazzi, Gavazzi, Gavazzi, Giavalisco, Gilmore, Giovagnoli, Gordon, Gorgas, Greggio, Greggio, Greggio, Grevesse, Hashimoto, Henry, Hillebrandt, Holmberg, Jablonka, Jablonka, Jonsell, Kasen, Kennicutt, Kennicutt, Kennicutt, Khokhlov, Kobayashi, Koeppen, Kroupa, Kroupa, Kuzio, Köppen, Larson, Larson, Larson, Lee, Leitherer, Lequeux, Maciel, Maeder, Maiolino, Mallik, Mannucci, Maoz, Marigo, Marino, Matteucci, Matteucci, Matteucci, Matteucci, Matteucci, Melchior, Meusinger, Mihara, Miller, Milone, Nepveu, Nepveu, Nittler, Nomoto, Nomoto, Nordström, Oey, Pagel, Pagel, Pagel, Pagel, Pagel, Panagia, Pardi, Paturel, Peimbert, Peimbert, Peimbert, Pilyugin, Portinari, Prantzos, Prantzos, Pérez, Reinecke, Renzini, Renzini, Rifatto, Roberts, Roberts, Rocha-Pinto, Rocha-Pinto, Romano, Ryan, Salpeter, Sandage, Sandage, Saviane, Scalo, Scannapieco, Scannapieco, Schmidt, Schmidt, Serrano, Smartt, Sommer-Larsen, Sullivan, Tasca, Thielemann, Thuan, Timmes, Tinsley, Tornambé, Tosi, Trimble, Tully, Tully, Twarog, van den, van der Kruit, van Zee, Weidemann, Wirth, Woosley, Woosley, Wyse, Wyse, Zaritsky   +166 more
core   +2 more sources

Exploring the Relationship between Stellar Mass, Metallicity, and Star Formation Rate at z ∼ 2.3 in KBSS-MOSFIRE

The Astrophysical Journal
The metal enrichment of a galaxy is determined by the cycle of baryons in outflows, inflows, and star formation. The relative contribution and timescale of each process sets the relationship between stellar mass, metallicity, and the star formation rate (
Nathalie A. Korhonen Cuestas, Allison L. Strom, Tim B. Miller, Charles C. Steidel, Ryan F. Trainor, Gwen C. Rudie, Evan Haze Nuñez   +6 more
doaj   +1 more source

Two-process Model and Residual Abundance Analysis of the Milky Way Massive Satellites

The Astrophysical Journal
The “two-process model” is a promising technique for interpreting stellar chemical abundance data from large-scale surveys (e.g., the Sloan Digital Sky Survey IV/V and the Galactic Archeology with HERMES survey), enabling more quantitative empirical ...
Sten Hasselquist, Christian R. Hayes, Emily J. Griffith, David Weinberg, Tawny Sit, Rachael L. Beaton, Danny Horta   +6 more
doaj   +1 more source