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2016

Cosmology with AGN: can we use quasars as standard candles?

Risaliti, G., Lusso, E.

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The non-linear relation between X-ray and UV luminosity in quasars can be used to estimate their distance.

Recently, we have shown that despite the large dispersion of the relation, a Hubble Diagram made of large samples of quasars can provide unique constraints on cosmology at high redshift.
Furthermore, the dispersion of the relation is heavily affected by measurement errors: until now we have used serendipitous X-ray observations, but dedicated observations would significantly increase the precision of the distance estimates.
We discuss the future role of XMM in this new field, showing (1) the fundamental contribution of the Serendipitous Source Catalogue and of large surveys, and (2) the breakthrough advancements we may achieve with the observation of a large number of SDSS quasars at high redshift: every ~10 quasars observed at z$\sim$3 would be equivalent to discovering a supernova at that redshift.

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Demianski, M., et al.: 2016, arXiv:1610.00854
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Lusso, E., & Risaliti: 2016, ApJ, 819, 154 (Paper II)
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