A new delay time distribution for merging neutron stars tested against Galactic and cosmic data
| Autor: | Francesca Matteucci, Paolo Simonetti, Laura Greggio, G. Cescutti |
|---|---|
| Přispěvatelé: | ITA, Simonetti, P., Matteucci, F., Greggio, L., Cescutti, G. |
| Rok vydání: | 2019 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
Milky Way Metallicity gamma-ray burst: general FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics general [gamma-ray burst] 01 natural sciences stars: neutron neutron [stars] Nucleosynthesis evolution. [Galaxy] 0103 physical sciences Galaxy formation and evolution 010303 astronomy & astrophysics nuclear reactions Solar and Stellar Astrophysics (astro-ph.SR) Galaxy: evolution High Energy Astrophysical Phenomena (astro-ph.HE) Physics abundances 010308 nuclear & particles physics Gravitational wave Star formation nucleosynthesis Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Redshift Neutron star Astrophysics - Solar and Stellar Astrophysics nuclear reactions nucleosynthesis abundance Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) nuclear reactions nucleosynthesis abundances Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Monthly Notices of the Royal Astronomical Society |
| ISSN: | 0035-8711 |
| DOI: | 10.1093/mnras/stz991 |
| Popis: | The merging of two neutron stars (MNS) is thought to be the source of short gamma-ray bursts (SGRB) and gravitational wave transients, as well as the main production site of r-process elements like Eu. We have derived a new delay time distribution (DTD) for MNS systems from theoretical considerations and we have tested it against (i) the SGRB redshift distribution and (ii) the Galactic evolution of Eu and Fe, in particular the [Eu/Fe] vs [Fe/H] relation. For comparison, we also tested other DTDs, as proposed in the literature. To address the first item, we have convolved the DTD with the cosmic star formation rate, while for the second we have employed a detailed chemical evolution model of the Milky Way. We have also varied the DTD of Type Ia SNe (the main Fe producers), the contribution to Eu production from core-collapse SNe, as well as explored the effect of a dependence on the metallicity of the occurrence probability of MNS. Our main results can be summarized as follows: (i) the SGRB redshift distribution can be fitted using DTDs for MNS that produce average timescales of 300-500 Myr; (ii) if the MNS are the sole producers of the Galactic Eu and the occurrence probability of MNS is constant the Eu production timescale must be on the order of 17 pages, 14 figures, submitted to MNRAS |
| Databáze: | OpenAIRE |
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