Spectral energy distribution profiles from AGN accretion disc in multigap set-up

ABSTRACT Spectral energy distribution (SED) of the broad-band continuum emission from black-hole accretion discs can serve as a tool to measure parameters central body and constrain geometry inner flow. We focus on case an active galactic nucleus (AGN), with disc dominating UV/optical bands. parametrize changes in thermal power-law components, which reveal diminution emissivity. To this end we explore effects gaps emerging SED that be caused by presence either (i) inner, optically thin, radiatively inefficient hot flow; (ii) secondary black hole embedded within disc; or (iii) combination both components. suggest resulting underlying help us understand some departures standard-disc scenario. estimate data required for such project must sampled detail over far-UV soft X-ray bands during interval about month corresponding characteristic variability time-scale AGN. Detecting gap at intermediate radii few 100 gravitational would require quality photometry uncertainties up $\sim 1~{{\ \rm per\ cent}}$. The cavity standard recovered UV photometric accuracy 5 per cent better. show effect intrinsic reddening source demonstrate when it disentangled.