| Autor: |
Di Mascia, F, Gallerani, S, Ferrara, A, Pallottini, A, Maiolino, R, Carniani, S, D'Odorico, V |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; Sep2021, Vol. 506 Issue 3, p3946-3961, 16p |
| Abstrakt: |
We investigate the attenuation law in z ∼ 6 quasars by combining cosmological zoom-in hydrodynamical simulations of quasar host galaxies, with multifrequency 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 with data from bright, early quasars. We show that only dust models with grain-size distributions in which small grains (|$a\lesssim 0.1~\mu {\rm m}$| , corresponding to |$\approx 60{{\ \rm per\ cent}}$| 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 fd ≃ 0.38, i.e. close to the Milky Way value. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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