A low-flux state in IRAS 00521−7054 seen with NuSTAR and XMM–Newton: relativistic reflection and an ultrafast outflow

Abstract

We present results from a deep, coordinated <em>XMM&ndash;Newton</em> + <em>NuSTAR</em> observation of the Seyfert 2 galaxy IRAS 00521&minus;7054. The <em>NuSTAR</em> data provide the first detection of this source in high-energy X-rays (<em>E &gt;</em> 10 keV), and the broad-band data show this to be a highly complex source which exhibits relativistic reflection from the inner accretion disc, further reprocessing by more distant material, neutral absorption, and evidence for ionized absorption in an extreme, ultrafast outflow (&or;_out &sim; 0.4c). Based on lamppost disc reflection models, we find evidence that the central supermassive black hole is rapidly rotating (&alpha; &gt; 0.77), consistent with previous estimates from the profile of the relativistic iron line, and that the accretion disc is viewed at a fairly high inclination (&iacute; &sim; 59^◦). Based on extensive simulations, we find the ultrafast outflow is detected at &sim;4&sigma; significance (or greater). We also estimate that the extreme outflow should be sufficient to power galaxy-scale feedback, and may even dominate the energetics of the total output from the system.