Broad line region and black hole mass of PKS 1510-089 from spectroscopic reverberation mapping

Abstract

Reverberation results of a flat spectrum radio quasar PKS 1510-089 are presented from 8.5-years long spectroscopic monitoring carried out in 9 observing seasons between December 2008 to June 2017 at Steward Observatory. Optical spectra show strong H$\beta$, H$\gamma$, and Fe II emission lines overlaying on a blue continuum. All the continuum and emission line light curves show significant variability with a fractional root-mean-square variation of $37.30\pm 0.06$% ($f_{5100}$), $11.88\pm 0.29$% (H$\beta$) and $9.61\pm 0.71$% (H$\gamma$), however, along with thermal radiation from accretion disk non-thermal emission from jet also contribute to $f_{5100}$. Several methods of time series analysis (ICCF, DCF, von Neumann, Bartels, JAVELIN, ${\chi }^2$) are used to measure lag between continuum and line light curves. The observed frame BLR size is found to be $61.1_{-3.2}^{+4.0}$ ($64.7_{-10.6}^{+27.1}$) light-days for H$\beta$ (H$\gamma$). Using ${\sigma }_{\mathrm{line}}$ of $1262\pm 247$ km s${}^{-1}$ measured from the rms spectrum, the black hole mass of PKS 1510-089 is estimated to be $5.71_{-0.58}^{+0.62}\times 10^7{M}_{\odot }$.

12 pages, accepted for publication in A&A

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