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tokens: Acknowledgements This project is funded by DST INSPIRE Faculty [IFA-12/PH-44](Department of Science and Technology (DST), Govt. of India) and DST-SERB Fast track scheme [SR/FTP/PS-118/2011] (Science and Engineering Board (SERB), Govt. of India). We are thankful to the Inter-University Centre for Astronomy and Astrophysics (IUCAA) for providing the HPC facility. RSJ would like to thank IUCAA for providing the research facilities as a visiting student. Computations described in this work were performed using the publicly available enzo code ( http://enzo-project.org ) and data analysis is done with the yt-tools ( http://yt-project.org/ ). Authors would also like to thank the editor and the anonymous referee for their critical comments that have definitely helped in improving the content of this paper.