Skip to main content
    • Aa
    • Aa

Chemo-dynamical evolution model: Enrichment of r-process elements in the Local Group dwarf galaxies

  • Yutaka Hirai (a1) (a2) (a3), Yuhri Ishimaru (a4) (a5), Takayuki R. Saitoh (a6), Michiko S. Fujii (a2), Jun Hidaka (a2) (a7) and Toshitaka Kajino (a1) (a2)...

Neutron star mergers are one of the candidate astrophysical site(s) of r-process. Several chemical evolution studies however pointed out that the observed abundance of r-process is difficult to reproduce by neutron star mergers. In this study, we aim to clarify the enrichment of r-process elements in the Local Group dwarf galaxies. We carry out numerical simulations of galactic chemo-dynamical evolution using an N-body/smoothed particle hydrodynamics code, ASURA. We construct a chemo-dynamical evolution model for dwarf galaxies assuming that neutron star mergers are the major source of r-process elements. Our models reproduce the observed dispersion in [Eu/Fe] as a function of [Fe/H] with neutron star mergers with a merger time of 100 Myr. We find that star formation efficiency and metal mixing processes during the first ≲ 300 Myr of galaxy evolution are important to reproduce the observations. This study supports that neutron star mergers are a major site of r-process.

Hide All
D. Argast , M. Samland , F.-K. Thielemann , & Y.-Z. Qian 2004, A&A, 416, 997

Y. Hirai , Y. Ishimaru , T. R. Saitoh , M. S. Fujii , J. Hidaka , & T. Kajino 2015, ApJ, 814, 41

Y. Ishimaru , S. Wanajo , & N. Prantzos 2015, ApJ, (Letter), 804, L35

Y. Revaz & P. Jablonka 2012, A&A, 538, A82

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
Please enter your name
Please enter a valid email address
Who would you like to send this to? *



Full text views

Total number of HTML views: 0
Total number of PDF views: 8 *
Loading metrics...

Abstract views

Total abstract views: 88 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 17th October 2017. This data will be updated every 24 hours.