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Galaxy Formation and Chemical Evolution

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Author(s)  
The manner the galaxy accretes matter, along with the star formation rates at different epochs, influences the evolution of the stable isotopic inventories of the galaxy. A detailed analysis is presented here to study the dependence of the galactic chemical evolution on the accretion scenario of the galaxy along with the star formation rate during the early accretionary phase of the galactic thick disk and thin disk. Our results indicate that a rapid early accretion of the galaxy during the formation of the galactic thick disk along with an enhanced star formation rate in the early stages of the galaxy accretion could explain the majority of the galactic chemical evolution trends of the major elements. Further, we corroborate the recent suggestions regarding the formation of a massive galactic thick disk rather than the earlier assumed low mass thick disk.
Cite this paper
Sahijpal, S. (2014) Galaxy Formation and Chemical Evolution. International Journal of Astronomy and Astrophysics, 4, 491-498. doi: 10.4236/ijaa.2014.43045.

References


[1] Chiappini, C., Matteucci, F. and Gratton, R. (1997) The Chemical Evolution of the Galaxy: The Two-Infall Model. The Astrophysical Journal, 477, 765-780. http://dx.doi.org/10.1086/303726
[2] Chang, R.X., Hou, J.L., Shu, C.G. and Fu, C.Q. (1999) Two-Component Model for the Chemical Evolution of the Galactic Disk. Astronomy and Astrophysics, 350, 38-48.
[3] Tutukov, A.V., Shustov, B.M. and Wiebe, D.S. (2000) The Stellar Epoch in the Evolution of the Galaxy. Astronomy Reports, 44, 711-718. http://dx.doi.org/10.1134/1.1320496
[4] Alibés, A., Labay, J. and Canal, R. (2001) Galactic Chemical Abundance Evolution in the Solar Neighborhood up to the Iron Peak. Astronomy and Astrophysics, 370, 1103-1121.
http://dx.doi.org/10.1051/0004-6361:20010296
[5] Sahijpal, S. and Gupta, G. (2013) Numerical Simulation of the Galactic Chemical Evolution: The Revised Solar Abundance. Meteoritics and Planetary Science, 48, 1007-1033.
http://dx.doi.org/10.1111/maps.12123
[6] Micali, A., Matteucci, F. and Romano, D. (2013) The Chemical Evolution of the Milky Way: The Three Infall Model. Monthly Notices of the Royal Astronomical Society, 436, 1648-1658.
http://dx.doi.org/10.1093/mnras/stt1681
[7] Snaith, O.N., et al. (2014) The Dominant Epoch of Star Formation in the Milky Way Formed the Thick Disk. The Astrophysical Journal Letters, 781, Article ID: L31.
[8] Haywood, M. (2014) Galactic Chemical Evolution Revisited. Memorie della Societa Astronomica Italiana Supplement, eprint arXiv:1401.1864.
[9] Asplund, M., Grevesse, N., Sauval, A.J. and Scott, P. (2009) The Chemical Composition of the Sun. Annual Review of Astronomy and Astrophysics, 47, 481-522.
http://dx.doi.org/10.1146/annurev.astro.46.060407.145222
[10] Sahijpal, S. (2013) Influence of Supernova SN Ia Rate and the Early Star Formation Rate on the Galactic Chemical Evolution. International Journal of Astrophysics and Astronomy, 3, 344-352. http://dx.doi.org/10.4236/ijaa.2013.33038
[11] Sahijpal, S. (2013) Inhomogeneous Chemical Evolution of the Galaxy in the Solar Neighbourhood. Journal of Astrophysics and Astronomy, 34, 297-316. http://dx.doi.org/10.1007/s12036-013-9188-2
[12] Sahijpal, S. (2014) Contributions of Type II and Ib/c Supernovae to Galactic Chemical Evolution. Research in Astronomy and Astrophysics, 14, 693-704.
http://dx.doi.org/10.1088/1674-4527/14/6/008
[13] Sahijpal, S. (2014) Evolution of the Galaxy and the Birth of the Solar System: The Short-Lived Nuclides Connection. Journal of Astrophysics and Astronomy, 35, 121-142.
http://dx.doi.org/10.1007/s12036-014-9298-5
[14] Matteucci, F. Spitoni, E., Recchi, S. and Valiante, R. (2009) The Effect of Different Type Ia Supernova Progenitors on Galactic Chemical Evolution. Astronomy and Astrophysics, 501, 531-538.
[15] Woosley, S.E. and Weaver, T.A. (1995) The Evolution and Explosion of Massive Stars. II. Explosive Hydrodynamics and Nucleosynthesis. The Astrophysical Journal Supplement, 101, 181-235.
http://dx.doi.org/10.1086/192237
[16] Karakas, A.I. and Lattanzio, J.C. (2007) Stellar Models and Yields of Asymptotic Giant Branch Stars. Publications of the Astronomical Society of Australia, 24, 103-117.
http://dx.doi.org/10.1071/AS07021
[17] Iwamoto, K., et al. (1999) Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation. The Astrophysical Journal Supplement, 125, 439-462. http://dx.doi.org/10.1086/313278               eww141222lx
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