Elucidating the global distribution of reprocessing gas in NGC 1194
Date Issued
2021
Author(s)
Abstract
A joint XMM-Newton and NuSTAR observation was conducted for the bright, local
Seyfert 1.9 galaxy, NGC 1194. The hard spectral form of this AGN was modeled
using the toroidal reprocessor MYTORUS. The decoupled model form provides a
good description of the spectrum, with reflection arising from gas with a
global average column density > 4 x 10^24 cm^-2 and transmission of the
continuum through an order-of-magnitude lower column. In this model, the
reflection strength is a factor ~3 higher than expected from a simple torus.
Such a result may indicate that much of the intrinsic X-ray continuum is hidden
from view. An alternative model is that of a patchy torus, where 85% of
sight-lines are obscured by Compton-thick gas and the remaining 15% by
Compton-thin gas. The patchy torus model is based on a solar abundance of Fe
and is consistent with X-ray partial-covering results found in other AGN. That
a patchy torus model would relieve the issue with the strength of the
reflection signature is not an intuitive result: such an insight regarding the
geometry of the global reprocessing gas could not have been obtained using ad
hoc model components to describe the spectral form.
Volume
498
Issue
2
Start page
1983
Issn Identifier
0035-8711
Rights
open.access
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