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The Impact of metallicity on early star formation

Aykutalp, A. (2008) The Impact of metallicity on early star formation. Master's Thesis / Essay, Astronomy.

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In this research we study the formation of a multi-phase ISM and early star formation in the universe by using the N-body hydrodynamical simulation code Enzo. We follow the collapse and cooling of minihalos with different metallicities. We use the star formation algorithm from Cen & Ostriker (1992) and include the chemical network of Spaans & Meijerink (2008); Meijerink & Spaans (2005). In our simulations we use 1283 grid cells on the top grid with two nested subgrids, each refining by a factor of two. The box size of the simulations is 0.25 h−1Mpc and 1h−1Mpc for cases with and without star formation, respectively. We run simulations over a redshift range of 70 to 5 for non-star formation case and 99 to 5 for the star formation case and use three different cooling prescriptions for the metallicities of 10−3, 10−2, and 10−1 Zo. We have found that metallicity impacts the star formation by allowing minihalos to cool to lower temperatures, which makes them collapse and evolve faster than the zero metallicity case. Due to the lack of resolution in our simulations we cannot address the fragmentation of the cloud.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:30
Last Modified: 15 Feb 2018 07:30

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