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Six XMM-Newton observations of the bright narrow line Seyfert 1, Mrk 110,from 2004-2020, are presented. The analysis of the grating spectra from theReflection Grating Spectrometer (RGS) reveals a broad component of the He-likeOxygen (OVII) line, with a full width at half maximum (FWHM) of $15900\pm1800$km s$^{-1}$ measured in the mean spectrum. The broad OVII line in all sixobservations can be modelled with a face-on accretion disk profile, where fromthese profiles the inner radius of the line emission is inferred to lie betweenabout 20-100 gravitational radii from the black hole. The derived inclinationangle, of about 10 degrees, is consistent with studies of the optical BroadLine Region in Mrk 110. The line also appears variable and for the first time,a significant correlation is measured between the OVII flux and the continuumflux from both the RGS and EPIC-pn data. Thus the line responds to thecontinuum, being brightest when the continuum flux is highest, similar to thereported behaviour of the optical HeII line. The density of the line emittinggas is estimated to be $n_{\rm e}\sim10^{14}$ cm$^{-3}$, consistent with anorigin in the accretion disk.

Variable oxygen emission from the accretion disk of Mrk 110