On the Seyfert 2 warm and cool infrared dichotomy
Abstract
Description
An optical spectropolarimetric study has shown that the detectability of polarised broad H-alpha in Seyfert 2 galaxies is correlated to the IRAS f60/f25 flux ratio where only those Seyfert 2s with "warm" IRAS colours show polarised broad line emission. It was suggested that those Seyfert 2s with "cool" IRAS colours have highly inclined tori which obscure the broad line scattering screen.
I present here hard X-ray observations inconsistent with this picture showing that the derived column densities of warm and cool Seyfert 2 galaxies are statistically the same. I suggest that the IRAS f60/f25 flux ratio is more consistent with implying the relative strength of galactic to Seyfert emission and provide supporting evidence for this view.
6 pages, 3 figures, to be published in a special issue of New Astronomy Reviews as part of the proceedings for "FIRSED 2000", a workshop held in Groningen, The Netherlands, April 27 - 29, 2000. Requires latex style files: elsart.sty, elsart.cls (included with submission)
6 pages, 3 figures, to be published in a special issue of New Astronomy Reviews as part of the proceedings for "FIRSED 2000", a workshop held in Groningen, The Netherlands, April 27 - 29, 2000. Requires latex style files: elsart.sty, elsart.cls (included with submission)