Abstract:
To understand the mass distribution and co-evolution of supermassive black holes with their host galaxy, it is crucial to measure
the black hole mass of AGN. Reverberation mapping is a unique tool to estimate the black hole masses in AGN. We performed
spectroscopic reverberation study using long-term monitoring data with more than 100 spectra of a radio-loud quasar PKS
0736 + 017 to estimate the size of the broad-line region (BLR) and black hole mass. The optical spectrum shows strong H β
and H γ emission lines. We generated the light curves of 5100 Å continuum flux (f5100), H β, and H γ . All the light curves
are found to be strongly variable with fractional variability of 69 per cent, 21 per cent, 30 per cent for V-band, H β, and H γ
light curves, respectively. Along with the thermal contribution, non-thermal emission contributes to the estimated continuum
luminosity at 5100 Å. Using different methods, e.g. CCF, JAVELIN, von-neumann, we estimated the size of the BLR, which is
found to be 66.4+6.0 −4.2 light days in the rest frame. The BLR size combined with the line width of H β provides a black hole mass
of 7.32+0.89 −0.91 × 107M . The source closely follows the BLR size–luminosity relation of AGN.
