Abstract Details

Name: Samuzal Barua
Affiliation: Gauhati University, Guwahati
Conference ID: ASI2021_99
Title : Observational evidence for the variation of coronal temperature in AGN
Authors and Co-Authors : Sanuzal Barua (Gauhati University, Guwahati). V. Jithesh (Inter-University Centre for Astronomy and Astrophysics, Pune), Ranjeev Misra (Inter-University Centre for Astronomy and Astrophysics, Pune), Gulab C Dewangan (Inter-University Centre for Astronomy and Astrophysics, Pune), Rathin Sarma (Rabindranath Tagore University, Assam), Amit Pathak (Banaras Hindu University, Varanasi), Biman J Medhi (Gauhati University, Guwahati).
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : The measurement of coronal temperature in active galactic nuclei (AGN) has been difficult due to the lack of instruments with high sensitivity at high energies. However, the high spectral resolution of NuSTAR above 10 keV has now allowed the measurement of the coronal temperature by spectral fitting. These direct measurements provided us with an exceptional opportunity to study the variation of the coronal temperature with flux. We performed flux resolved spectroscopy on the NuSTAR observations of two AGN, Ark 564 and ESO 103–035. While For Ark 564, we observed a decrease in the coronal temperature as the flux increased, the opposite was seen for ESO 103–035 where the coronal temperature increased as the flux increased. In this talk, I will describe the results and discuss the possible mechanism responsible for this different behavior of these sources.