University of Cambridge > > Institute of Astronomy Seminars > Do Supermassive Black Holes need Iron Supplements?

Do Supermassive Black Holes need Iron Supplements?

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The metal abundances of high redshift quasar broad-line regions are commonly inferred to be significantly higher than the ISM gas-phase metallicities of their host galaxies. We present new photoionization models which demonstrate that the range of high-ionization UV broad line ratios observed in luminous quasar spectra can in fact be explained by changes in the density and location of the emitting gas, without the need for super-solar metallicities. Within our new paradigm, quasars with stronger outflow signatures show stronger emission from gas which is denser and located closer-in to the ionizing source.

This talk is part of the Institute of Astronomy Seminars series.

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