Limits on dust obscuration in QSOs

Details Limits on dust obscuration in QSOs Limits on dust obscuration in QSOs

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277l..63b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 3, pp. L63-L66.

Astronomy and Astrophysics

Astronomy

26

Dust, Extinction, Quasars: General, X-Rays: Galaxies

Scientific paper

We investigate the recent claim by Webster et al. that up to 80 per cent of all QSOs could be obscured by significant amounts of dust (up to A_B=5 mag). Using a sample of 68 X-ray-selected QSOs with near-complete optical spectroscopic identification, we demonstrate that the observed spread in the optical-to-X-ray flux ratios for such QSOs is consistent with an observed B-band extinction of less than A_B=2 mag. Moreover, comparison with an optically selected sample reveals that most of this spread is probably due to effects other than dust obscuration, and that the true upper limit to extinction caused by dust is likely to be much lower.

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