Fe K Emission and Absorption in the XMM-EPIC Spectrum of the Seyfert Galaxy IC 4329a

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dc.creatorMarkowitz, A.
dc.creatorReeves, J.
dc.creatorBraito, V.
dc.date2006-04-17
dc.date2006-06-22
dc.date.accessioned2026-07-07T10:43:51Z
dc.date.available2026-07-07T10:43:51Z
dc.descriptionWe present a detailed analysis of the XMM-Newton long-look of the Seyfert galaxy IC 4329a. The Fe K bandpass is dominated by two resolved peaks at 6.4 keV and 7.0 keV, consistent with neutral or near-neutral Fe K alpha and K beta emission. There is a prominent redward asymmetry in the 6.4 keV line, which could indicate emission from a Compton shoulder. Alternatively, models using dual relativistic disklines are found to describe the emission profile well. A low-inclination, moderately-relativistic dual-diskline model is possible if the contribution from narrow components, due to distant material, is small or absent. A high-inclination, moderately relativistic profile for each peak is possible if there are roughly equal contributions from both the broad and narrow components. Combining the XMM-Newton data with RXTE monitoring data, we explore the time-resolved spectral behavior on time scales from hours to 2 years. We find no strong evidence for variability of the Fe K line flux on any time scale, likely due to the minimal level of continuum variability. We detect, at high significance, a narrow absorption line at 7.68 keV. This feature is most likely due to Fe XXVI K alpha absorption blueshifted to about 0.1c relative to the systemic velocity, suggesting a high-velocity, highly-ionized outflow component. As is often the case with similar outflows seen in high-luminosity quasars, the power associated with the outflow represents a substantial portion of the total energy budget of the AGN. The outflow could arise from a radiatively-driven disk wind, or it may be in the form of a discrete, transient blob of ejected material.
dc.descriptionAccepted for publication in The Astrophysical Journal; 25 pages; 11 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0604353
dc.identifierhttp://arxiv.org/abs/astro-ph/0604353
dc.identifierAstrophys.J.646:783-800,2006
dc.identifierdoi:10.1086/505107
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182388
dc.subjectAstrophysics
dc.titleFe K Emission and Absorption in the XMM-EPIC Spectrum of the Seyfert Galaxy IC 4329a
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