Feb 7 – 9, 2017
Radisson Hotel Lansing
US/Eastern timezone

Constraining the energy and statistics of neutron star mergers by simulating R-process element production in ultra faint dwarf galaxies

Feb 9, 2017, 9:30 AM
15m
Radisson Hotel Lansing

Radisson Hotel Lansing

111 N Grand Ave, Lansing, MI 48933
Talk [Main Conference] Contributed talk Session 9

Speaker

Dr Mohammadtaher Safarzadeh (Arizona State University)

Description

We perform cosmological zoom-in simulations with the goal of studying the energy and statistics of the neutron star mergers in order to explain the high observed abundances of R-process elements in local ultra faint dwarf (UFD) galaxies. We model our star formation in a stochastic fashion in order to resolve the stellar mass content the UFDs. We perform zoom simulations on two different halos at $z\sim6$ with mass $\sim10^8 M_{\odot}$ and model a single neutron star merger (NSM) in the start formation history of these systems. We explore the Injected energy range of $10^{50}-10^{51}$ erg and coalescence time scale of 1-20 Myr for the NSM event. We find the the distribution of the stars in [Eu/H] vs. [Fe/H] is mostly sensitive to the amount of R-process mass that is ejected into the ISM ($M_r$) per NSM event. We find that $M_r=10^{-3}M_{\odot}$ explains the observed abundance of R-process elements in the local UFDs and lower (higher) values of $M_r$ will heavily under(over) predict the [Eu/H] of the stars which is in not supported by the observations requiring only one such events to have taken place in the star formation history of the UFDs.

Primary author

Dr Mohammadtaher Safarzadeh (Arizona State University)

Co-author

Prof. Evan Scannapieco (Arizona State University)

Presentation materials

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