Abstract Details
| Name: Sabhya Hebbar Affiliation: Christ (Deemed to be University), Bengaluru Conference ID: ASI2019_121 Title : Temporal properties of the black hole candidate MAXI J1820+070 using AstroSat Authors and Co-Authors : Sabhya H. (1), Sneha Prakash M. (1), S. B. Gudennavar (1), S. G. Bubbly (1) and R. Misra (2) (1) Department of Physics and Electronics, CHRIST (Deemed to be University), Hosur Road, Bengaluru-560029, India. (2) Inter-University Centre for Astronomy and Astrophysics, Ganeshkind, Pune-411007, India. Abstract Type : Oral Abstract Category : Stars, ISM and Galaxy Abstract : The black hole candidate MAXI J1820+070 was first detected during its outburst in March 2018. Located at a distance of ~ 3 kpc, it is one of the brightest X-ray novae detected till date. Since its detection, the source has been continuously monitored by MAXI. Unlike other X-ray transients, this source has shown rapid and frequent spectral state transitions (soft-hard-soft). During one such spectral state transition, the source was observed by AstroSat from 30th to 31st March 2018. In this work, we present the results of the first temporal studies of MAXI J1820+070 in the energy range 3-80 keV as seen by Large Area X-ray Proportional Counters (LAXPC) on-board AstroSat. We have done comprehensive timing studies to understand the behaviour of energy dependent time-lags and root mean squared variability at different frequencies. Fitting the data empirically to explain the observed behaviour, revealed that the hard energy photons lag the soft energy photons in the order of milliseconds. We have computed the power spectra to study Quasi Periodic Oscillations (QPOs) and the power spectra shows three broadened peaks. Preliminary results of our temporal analysis suggest that MAXI J1820+070 is a black hole and further investigation are underway to support this claim. |