Spectroscopic reverberation mapping of Quasar PKS 0736+017: Broad-Line Region and Black-hole Mass

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$\beta$ and H$\gamma$ emission lines. We generated the light curves of 5100Å continuum flux ($f_{5100}$), H$\beta$, and H$\gamma$. All the light curves are found to be strongly variable with fractional variability of 69$\%$, 21$\%$, 30$\%$ for V-band, H$\beta$, and H$\gamma$ light curves, respectively. Along with the thermal contribution, non-thermal emission contributes to the estimated continuum luminosity at 5100Å. Using different methods, e.g., CCF, {\small JAVELIN}, von-neumann, we estimated the size of the BLR, which is found to be 66.4${}_{-4.2}^{+6.0}$ light days in the rest frame. The BLR size combined with the line width of H$\beta$ provides a black hole mass of 7.32${}_{-0.91}^{+0.89}\times 10^7{M}_{\odot }$. The source closely follows the BLR size-luminosity relation of AGN.

published in MNRAS, 13 pages, 13 figures

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Cited by in corpus (1)

• The Fermi-LAT Light Curve Repository: A resource for the time-domain and multi-messenger communities