The soft X-ray polarization in obscured AGN

Details The soft X-ray polarization in obscured AGN The soft X-ray polarization in obscured AGN

2009-05-29

arxiv.org/abs/0905.4845v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

6 pages, 3 figures, to appear in 'X-ray Polarimetry: A New Window in Astrophysics', edited by R. Bellazzini, E. Costa, G. Matt

Scientific paper

The soft X-ray emission in obscured active galactic nuclei (AGN) is dominated by emission lines, produced in a gas photoionized by the nuclear continuum and likely spatially coincident with the optical narrow line region (NLR). However, a fraction of the observed soft X-ray flux appears like a featureless power law continuum. If the continuum underlying the soft X-ray emission lines is due to Thomson scattering of the nuclear radiation, it should be very highly polarized. We calculated the expected amount of polarization assuming a simple conical geometry for the NLR, combining these results with the observed fraction of the reflected continuum in bright obscured AGN.

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