Chandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales?

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dc.contributor.authorYan, Wei
dc.contributor.authorHickox, Ryan C.
dc.contributor.authorChen, Chien-Ting J.
dc.contributor.authorRicci, Claudio
dc.contributor.authorMasini, Alberto
dc.contributor.authorBauer, Franz E.
dc.contributor.authorAlexander, David M.
dc.date.accessioned2025-01-20T22:19:32Z
dc.date.available2025-01-20T22:19:32Z
dc.date.issued2021
dc.description.abstractIn active galactic nuclei (AGNs), fluorescent Fe K alpha (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(M-*/M-circle dot) > 10 at 0.5 < z < 2, obtaining 25 sources with high-infrared (IR) luminosity (star formation rate, SFRFIR >= 17 M-circle dot 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 3 sigma 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.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/abfaa0
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/abfaa0
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94599
dc.identifier.wosidWOS:000662658800001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleChandra Observations of Excess Fe Kα Line Emission in Galaxies with High Star Formation Rates: X-Ray Reflection on Galaxy Scales?
dc.typeartículo
dc.volumen914
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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