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X-ray signatures of the polar dusty gas in AGN

X-ray signatures of the polar dusty gas in AGN
X-ray signatures of the polar dusty gas in AGN
Recent mid-infrared interferometry observations of nearby active galactic nuclei (AGN) revealed that a significant part of the dust emission extends in the polar direction, rather than the equatorial torus/disc direction as expected by the traditional unification model. We study the X-ray signatures of this polar dusty gas with ray-tracing simulations. Different from those from the ionized gas, the scattered emission from the polar dusty gas produces self-absorption and neutral-like fluorescence lines, which are potentially a unique probe of the kinematics of the polar dusty gas. The anomalously small Fe Kα/Si Kα ratios of type 2 AGN observed previously can be naturally explained by the polar dusty gas, because the polar emission does not suffer from heavy absorption by the dense equatorial gas. The observed Si Kα lines of the Circinus galaxy and NGC 1068 show blueshifts with respect to the systemic velocities of the host galaxies, consistent with an outflowing scenario of the Si Kα-emitting gas. The 2.5-3 keV image of the Circinus galaxy is elongated along the polar direction, consistent with an origin of the polar gas. These results show that the polar-gas-scattered X-ray emission of type 2 AGN is an ideal objective for future X-ray missions, such as Athena.
0035-8711
4344-4352
Liu, Jiren
0831a21a-8502-4ffa-851e-2a05d2be5f5a
Hönig, Sebastian F.
be0bb8bc-bdac-4442-8edc-f735834f3917
Ricci, Claudio
47c48bd5-233e-41dd-824a-3df26357d84f
Paltani, Stéphane
6f294798-6480-460b-855c-dd78add8b6c7
Liu, Jiren
0831a21a-8502-4ffa-851e-2a05d2be5f5a
Hönig, Sebastian F.
be0bb8bc-bdac-4442-8edc-f735834f3917
Ricci, Claudio
47c48bd5-233e-41dd-824a-3df26357d84f
Paltani, Stéphane
6f294798-6480-460b-855c-dd78add8b6c7

Liu, Jiren, Hönig, Sebastian F., Ricci, Claudio and Paltani, Stéphane (2019) X-ray signatures of the polar dusty gas in AGN. Monthly Notices of the Royal Astronomical Society, 4344-4352. (doi:10.1093/mnras/stz2908).

Record type: Article

Abstract

Recent mid-infrared interferometry observations of nearby active galactic nuclei (AGN) revealed that a significant part of the dust emission extends in the polar direction, rather than the equatorial torus/disc direction as expected by the traditional unification model. We study the X-ray signatures of this polar dusty gas with ray-tracing simulations. Different from those from the ionized gas, the scattered emission from the polar dusty gas produces self-absorption and neutral-like fluorescence lines, which are potentially a unique probe of the kinematics of the polar dusty gas. The anomalously small Fe Kα/Si Kα ratios of type 2 AGN observed previously can be naturally explained by the polar dusty gas, because the polar emission does not suffer from heavy absorption by the dense equatorial gas. The observed Si Kα lines of the Circinus galaxy and NGC 1068 show blueshifts with respect to the systemic velocities of the host galaxies, consistent with an outflowing scenario of the Si Kα-emitting gas. The 2.5-3 keV image of the Circinus galaxy is elongated along the polar direction, consistent with an origin of the polar gas. These results show that the polar-gas-scattered X-ray emission of type 2 AGN is an ideal objective for future X-ray missions, such as Athena.

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More information

e-pub ahead of print date: 18 October 2019
Published date: December 2019

Identifiers

Local EPrints ID: 446837
URI: http://eprints.soton.ac.uk/id/eprint/446837
ISSN: 0035-8711
PURE UUID: 89d7708e-dd50-42b9-adef-720f3bac1c5b

Catalogue record

Date deposited: 24 Feb 2021 17:30
Last modified: 24 Feb 2021 17:30

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Contributors

Author: Jiren Liu
Author: Claudio Ricci
Author: Stéphane Paltani

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