Wei Yan
Chandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales?
Yan, Wei; Hickox, Ryan C.; Chen, Chien-Ting J.; Ricci, Claudio; Masini, Alberto; Bauer, Franz E.; Alexander, David M.
Authors
Ryan C. Hickox
Chien-Ting J. Chen
Claudio Ricci
Alberto Masini
Franz E. Bauer
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
Abstract
In active galactic nuclei (AGNs), fluorescent Fe Kα (iron) line emission is generally interpreted as originating from obscuring material around a supermassive black hole on the scale of a few parsecs. However, recent Chandra studies indicate the existence of iron line emission extending to kiloparsec scales in the host galaxy. The connection between iron line emission and large-scale material can be spatially resolved directly only in nearby galaxies, but could be inferred in more distant AGNs by a connection between line emission and star-forming gas and dust that is more extended than the parsec-scale torus. Here we present the results from a stacking analysis and X-ray spectral fitting performed on sources in the Chandra Deep Field South (CDFS) 7 Ms observations. From the deep stacked spectra, we select sources with stellar mass log 10 M M > * ( ) at 0.5 < z < 2, obtaining 25 sources with high-infrared (IR) luminosity (star formation rate, SFRFIR … 17 M☉ yr−1 ) and 32 sources below this threshold. We find that the equivalent width (EW) of the iron line EW(Fe) is a factor of three higher with 3σ significance for high-IR luminosity measured from Herschel observations, indicating a connection between iron line emission and star-forming material on galaxy scales. We show that there is no significant dependence of the EW(Fe) on M* or X-ray luminosity, suggesting that the reflection of AGN X-ray emission over large scales in their host galaxies may be widespread.
Citation
Yan, W., Hickox, R. C., Chen, C. J., Ricci, C., Masini, A., Bauer, F. E., & Alexander, D. M. (2021). Chandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales?. Astrophysical Journal, 914(2), Article 83. https://doi.org/10.3847/1538-4357/abfaa0
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 20, 2021 |
Online Publication Date | Jun 17, 2021 |
Publication Date | 2021-06 |
Deposit Date | Aug 23, 2021 |
Publicly Available Date | Mar 29, 2024 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 914 |
Issue | 2 |
Article Number | 83 |
DOI | https://doi.org/10.3847/1538-4357/abfaa0 |
Files
Published Journal Article
(956 Kb)
PDF
Copyright Statement
© 2021. The American Astronomical Society. All rights reserved.
You might also like
A new discovery space opened by eROSITA: Ionised AGN outflows from X-ray selected samples
(2023)
Journal Article
DESI z ≳ 5 Quasar Survey. I. A First Sample of 400 New Quasars at z ∼ 4.7–6.6
(2023)
Journal Article
The Quasar Feedback Survey: characterizing CO excitation in quasar host galaxies
(2023)
Journal Article
Obscuration beyond the nucleus: infrared quasars can be buried in extreme compact starbursts
(2023)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search