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

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