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Testing Super-Eddington Accretion onto a Supermassive Black Hole: Reverberation Mapping of PG 1119+120
Fergus R. Donnan, Juan V. Hernández Santisteban, Keith Horne, Chen Hu, Pu Du, Yan-Rong Li, Ming Xiao, Luis C. Ho, Jesús Aceituno, Jian-Min Wang, Wei-Jian Guo, Sen Yang, Bo-Wei Jiang, Zhu-Heng Yao
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We measure the black hole mass and investigate the accretion flow around the local (z=0.0502) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides Hβ lags and linewidths from which we estimate a black hole mass of log(M_∙/M_⊙ ) = 7.0, uncertain by ∼0.4 dex. High cadence photometric monitoring over two years with the Las Cumbres Observatory provides lightcurves in 7 optical bands suitable for intensive continuum reverberation mapping. We identify variability on two timescales. Slower variations on a 100-day timescale exhibit excess flux and increased lag in the u′ band and are thus attributable to diffuse bound-free continuum emission from the broad line region. Faster variations that we attribute to accretion disc reprocessing lack a u′-band excess and have flux and delay spectra consistent with either τ∝λ^(4/3), as expected for a temperature structure of T(R) ∝R^(-3/4) for a thin accretion disc, or τ∝λ² expected for a slim disc. Decomposing the flux into variable (disc) and constant (host galaxy) components, we find the disc SED to be flatter than expected with f_ν ∼const. Modelling the SED predicts an Eddington ratio of λ_(Edd) > 1, where the flat spectrum can be reproduced by a slim disc with little dust extinction or a thin disc which requires more dust extinction. While this accretion is super-Eddington, the geometry is still unclear, however a slim disc is expected due to the high radiation pressure at these accretion rates, and is entirely consistent with our observations.
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