Nanodiamond dust and the energy distribution of quasars

Details Nanodiamond dust and the energy distribution of quasars Nanodiamond dust and the energy distribution of quasars

2005-09-24

arxiv.org/abs/astro-ph/0509735v1

Astronomy and Astrophysics

Astrophysics

In proceedings of Granada workshop on high redshift radio-galaxies, Spain 2005, to appear in Astronomishe Nachrichten

Scientific paper

10.1002/asna.200510497

The spectral energy distribution of quasars shows a sharp steepening of the continuum shortward of ~ 1100 A. The steepening could be a result of dust absorption. We present a dust extinction model which considers crystalline carbon grains and compare it with SMC-like dust extinction consisting of a mixture of silicate grains with graphite or amorphous carbon grains. We show that the sharp break seen in individual quasar spectra of intermediate redshif \~ 1-2 can be reproduced by dust absorption provided the extinction curve consists of nanodiamonds, composed of terrestial cubic diamonds or of diamonds similar to the presolar nanodiamonds found in primitive meteorites.

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