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Tracking the Iron Ka line and the Ultra Fast Outflow in NGC 2992 at different accretion states

Tracking the Iron Ka line and the Ultra Fast Outflow in NGC 2992 at different accretion states Thumbnail


Abstract

The Seyfert 2 galaxy NGC 2992 has been monitored eight times by XMM-Newton in 2010 and then observed again in 2013, while in 2015 it was simultaneously targeted by Swift and NuSTAR. XMM-Newton always caught the source in a faint state (2-10 keV fluxes ranging from 0.3 to 1.6× 10-11 erg cm-2 s-1) but NuSTAR showed an increase in the 2-10 keV flux up to 6× 10-11 erg cm-2 s-1. We find possible evidence of an Ultra Fast Outflow with velocity v1 = 0.21 ± 0.01c (detected at about 99% confidence level) in such a flux state. The UFO in NGC 2992 is consistent with being ejected at a few tens of gravitational radii only at accretion rates greater than 2% of the Eddington luminosity. The analysis of the low flux 2010/2013 XMM data allowed us to determine that the Iron Ka emission line complex in this object is likely the sum of three distinct components: a constant, narrow one due to reflection from cold, distant material (likely the molecular torus); a narrow, but variable one which is more intense in brighter observations and a broad relativistic one emitted in the innermost regions of the accretion disk, which has been detected only in the 2003 XMM observation. Galaxies: active, Galaxies: Seyfert, Galaxies: accretion, Individual: NGC 2992

Citation

(2018). Tracking the Iron Ka line and the Ultra Fast Outflow in NGC 2992 at different accretion states. Monthly Notices of the Royal Astronomical Society, 5651-5662. https://doi.org/10.1093/mnras/sty1436

Acceptance Date May 29, 2018
Publication Date Aug 21, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 5651-5662
DOI https://doi.org/10.1093/mnras/sty1436
Keywords Galaxies: active - Galaxies: Seyfert - Galaxies: accretion - Individual:
NGC 2992
Publisher URL http://dx.doi.org/10.1093/mnras/sty1436

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