Nanodiamond dust and the energy distribution of quasars

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The spectral energy distribution of quasars shows a sharp steepening of the continuum shortward of ≃ 1100 Å. 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 redshift ∼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.

Original languageEnglish
JournalAstronomische Nachrichten
Issue number2-3
Pages (from-to)151-154
Number of pages4
Publication statusPublished - 3 Apr 2006

    Research areas

  • Galaxies: active, ISM: dust, Ultraviolet emission

ID: 232622794