The dust attenuation law in $z\sim 6$ quasars
Autor: | Simona Gallerani, S. Carniani, Roberto Maiolino, Valentina D'Odorico, Andrea Pallottini, F. Di Mascia, Andrea Ferrara |
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Přispěvatelé: | Di Mascia, F, Gallerani, S, Ferrara, A, Pallottini, A, Maiolino, R, Carniani, S, D’Odorico, V, Maiolino, Roberto [0000-0002-4985-3819], Apollo - University of Cambridge Repository |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Milky Way
Extinction (astronomy) FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences methods: numerical Settore FIS/05 - Astronomia e Astrofisica quasars: general 0103 physical sciences ISM [Galaxies] Radiative transfer 010303 astronomy & astrophysics Dust extinction Astrophysics::Galaxy Astrophysics Physics numerical [Methods] 010308 nuclear & particles physics Attenuation Spectral density Astronomy and Astrophysics Quasar general [Quasars] Astrophysics - Astrophysics of Galaxies Grain size Galaxy Space and Planetary Science radiative transfer Astrophysics of Galaxies (astro-ph.GA) dust extinction Astrophysics::Earth and Planetary Astrophysics galaxies: ISM |
Popis: | We investigate the attenuation law in $z\sim 6$ quasars by combining cosmological zoom-in hydrodynamical simulations of quasar host galaxies, with multi-frequency radiative transfer calculations. We consider several dust models differing in terms of grain size distributions, dust mass and chemical composition, and compare the resulting synthetic Spectral Energy Distributions (SEDs) with data from bright, early quasars. We show that only dust models with grain size distributions in which small grains ($a < 0.1~\mu$m, corresponding to $\approx 60\%$ of the total dust mass) are selectively removed from the dusty medium provide a good fit to the data. Removal can occur if small grains are efficiently destroyed in quasar environments and/or early dust production preferentially results in large grains. Attenuation curves for these models are close to flat, and consistent with recent data; they correspond to an effective dust-to-metal ratio $f_d \simeq 0.38$, i.e. close to the Milky Way value. STFC ERC |
Databáze: | OpenAIRE |
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