The nature of massive black hole binary candidates: II. Spectral energy distribution atlas

Abstract

Recoiling supermassive black holes (SMBHs) are considered one plausible physical mechanism to explain high velocity shifts between narrow and broad emission lines sometimes observed in quasar spectra. If the sphere of influence of the recoiling SMBH is such that only the accretion disc is bound, the dusty torus would be left behind, hence the SED should then present distinctive features (i.e. a mid-infrared deficit). Here we present results from fitting the Spectral Energy Distributions (SEDs) of 32 Type-1 AGN with high velocity shifts between broad and narrow lines. The aim is to find peculiar properties in the multi-wavelength SEDs of such objects by comparing their physical parameters (torus and disc luminosity, intrinsic reddening, and size of the 12$\mu$m emitter) with those estimated from a control sample of $\sim 1000$ \emph{typical} quasars selected from the Sloan Digital Sky Survey in the same redshift range. We find that all sources, with the possible exception of J1154+0134, analysed here present a significant amount of 12~$\mu$m emission. This is in contrast with a scenario of a SMBH displaced from the center of the galaxy, as expected for an undergoing recoil event.

arXiv comment19 pages, 7 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society

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