Evolution of neutron capture elements in dwarf galaxies
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Evolution of neutron capture elements in dwarf galaxies. / Molero, Marta; Romano, Donatella; Reichert, Moritz; Matteucci, Francesca; Arcones, Almudena; Cescutti, Gabriele; Simonetti, Paolo; Hansen, Camilla Juul; Lanfranchi, Gustavo A.
I: Monthly Notices of the Royal Astronomical Society, Bind 505, Nr. 2, 02.08.2021, s. 2913-2931.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Evolution of neutron capture elements in dwarf galaxies
AU - Molero, Marta
AU - Romano, Donatella
AU - Reichert, Moritz
AU - Matteucci, Francesca
AU - Arcones, Almudena
AU - Cescutti, Gabriele
AU - Simonetti, Paolo
AU - Hansen, Camilla Juul
AU - Lanfranchi, Gustavo A.
PY - 2021/8/2
Y1 - 2021/8/2
N2 - We study the evolution of europium (Eu) and barium (Ba) abundances in Local Group dwarf spheroidal and ultrafaint dwarf galaxies by means of detailed chemical evolution models and compare our results with new sets of homogeneous abundances. The adopted models include gas infall and outflow and have been previously tested. We investigate several production scenarios for r-process elements: merging neutron stars and magnetorotational-driven supernovae. Production of Ba through the main s-process acting in low- and intermediate-mass stars is considered as well. We also test different sets of nucleosynthesis yields. For merging neutron stars we adopt either a constant and short delay time for merging or a delay time distribution function. Our simulations show that (i) if r-process elements are produced only by a quick source, it is possible to reproduce the [Eu/Fe] versus [Fe/H], but those models fail in reproducing the [Ba/Fe] versus [Fe/H]. (ii) If r-process elements are produced only with longer delays the opposite happens. (iii) If both a quick source and a delayed one are adopted, such as magnetorotational-driven supernovae and merging neutron stars with a delay time distribution, the [Eu/Fe] abundance pattern is successfully reproduced, but models still fail in reproducing the [Ba/Fe]. (iv) On the other hand, the characteristic abundances of Reticulum II can be reproduced only if both the Eu and the r-process fraction of Ba are produced on short and constant time delays during a single merging event. We discuss also other possible interpretations, including an inhomogeneous mixing of gas that might characterize this galaxy.
AB - We study the evolution of europium (Eu) and barium (Ba) abundances in Local Group dwarf spheroidal and ultrafaint dwarf galaxies by means of detailed chemical evolution models and compare our results with new sets of homogeneous abundances. The adopted models include gas infall and outflow and have been previously tested. We investigate several production scenarios for r-process elements: merging neutron stars and magnetorotational-driven supernovae. Production of Ba through the main s-process acting in low- and intermediate-mass stars is considered as well. We also test different sets of nucleosynthesis yields. For merging neutron stars we adopt either a constant and short delay time for merging or a delay time distribution function. Our simulations show that (i) if r-process elements are produced only by a quick source, it is possible to reproduce the [Eu/Fe] versus [Fe/H], but those models fail in reproducing the [Ba/Fe] versus [Fe/H]. (ii) If r-process elements are produced only with longer delays the opposite happens. (iii) If both a quick source and a delayed one are adopted, such as magnetorotational-driven supernovae and merging neutron stars with a delay time distribution, the [Eu/Fe] abundance pattern is successfully reproduced, but models still fail in reproducing the [Ba/Fe]. (iv) On the other hand, the characteristic abundances of Reticulum II can be reproduced only if both the Eu and the r-process fraction of Ba are produced on short and constant time delays during a single merging event. We discuss also other possible interpretations, including an inhomogeneous mixing of gas that might characterize this galaxy.
KW - stars: neutron
KW - galaxies: abundances
KW - galaxies: dwarf
KW - galaxies: evolution
KW - ASYMPTOTIC GIANT BRANCH
KW - STAR-FORMATION HISTORIES
KW - ROTATING MASSIVE STARS
KW - R-PROCESS
KW - CHEMICAL EVOLUTION
KW - S-PROCESS
KW - IA SUPERNOVAE
KW - DARK-MATTER
KW - NUCLEOSYNTHESIS
KW - ENRICHMENT
U2 - 10.1093/mnras/stab1429
DO - 10.1093/mnras/stab1429
M3 - Journal article
VL - 505
SP - 2913
EP - 2931
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 276162499