1. Department of Physics, Jamia Millia Islamia, New Delhi-110025, India
2. Department of Physics, Istanbul Technical University, Maslak 34469 Istanbul, Turkey
3. School of Mathematics and Statistics, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, United Kingdom
4. Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, Rio Grande do Sul, Brazil
5. Divisão de Astrofísica, Instituto Nacional de Pesquisas Espaciais, Avenida dos Astronautas 1758, São José dos Campos, 12227-010, São Paulo, Brazil
6. Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi-110025, India