The WISSH quasars Project: II. Giant star nurseries in hyper-luminous quasars
F. Duras, A. Bongiorno, E. Piconcelli, S. Bianchi, C. Pappalardo, R., Valiante, M. Bischetti, C. Feruglio, S. Martocchia, R. Schneider, G. Vietri,, C. Vignali, L. Zappacosta, F. La Franca, F. Fiore

TL;DR
This study analyzes the spectral energy distributions of hyper-luminous quasars to understand the interplay between quasar activity and star formation, revealing extreme luminosities, hot dust components, and a new quasar-star formation luminosity relation.
Contribution
It provides detailed SED modeling of the brightest quasars, identifying a hotter dust component in some, and establishes a new correlation between quasar and star formation luminosities.
Findings
Most SEDs fit standard accretion disk+torus and cold dust models.
About 30% of quasars show a hotter dust component at 750K.
Derived a new relation: star formation luminosity scales with quasar luminosity to the power 0.73.
Abstract
Studying the coupling between the energy output produced by the central quasar and the host galaxy is fundamental to fully understand galaxy evolution. Quasar feedback is indeed supposed to dramatically affect the galaxy properties by depositing large amounts of energy and momentum into the ISM. In order to gain further insights on this process, we study the SEDs of sources at the brightest end of the quasar luminosity function, for which the feedback mechanism is supposed to be at its maximum. We model the rest-frame UV-to-FIR SEDs of 16 WISE-SDSS Selected Hyper-luminous (WISSH) quasars at 1.8 < z < 4.6 disentangling the different emission components and deriving physical parameters of both the nuclear component and the host galaxy. We also use a radiative transfer code to account for the contribution of the quasar-related emission to the FIR fluxes. Most SEDs are well described by a…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astrophysics and Star Formation Studies · Stellar, planetary, and galactic studies
