Quasars as standard candles II: The non linear relation between UV and X-ray emission at high redshifts

26 Sep 2019 Salvestrini Francesco Risaliti Guido Bisogni Susanna Lusso Elisabeta Vignali Cristian

A tight non-linear relation between the X-ray and the optical-ultraviolet (UV) emission has been observed in Active Galactic Nuclei (AGN) over a wide range of redshift and several orders of magnitude in luminosity, suggesting the existence of an ubiquitous physical mechanism regulating the energy transfer between the accretion disc and the X-ray emitting corona. Recently, our group developed a method to use this relation in the observational cosmology, turning quasars into standardizable candles... (read more)

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Categories


  • ASTROPHYSICS OF GALAXIES
  • COSMOLOGY AND NONGALACTIC ASTROPHYSICS