Simultaneous NuSTAR and XMM-Newton 0.5-80 keV spectroscopy of the Narrow Line Seyfert 1 galaxy SWIFT J2127.4+5654

Abstract

We present a broad band spectral analysis of the joint XMM-Newton and NuSTAR observational campaign of the Narrow Line Seyfert 1 SWIFT J2127.4+5654, consisting of 300 ks performed during three XMM-Newton orbits. We detect a relativistic broadened iron K$\alpha$ line originating from the innermost regions of the accretion disc surrounding the central black hole, from which we infer an intermediate spin of $a$=$0.58_{-0.17}^{+0.11}$. The intrinsic spectrum is steep ($\Gamma =2.08\pm 0.01$) as commonly found in Narrow Line Seyfert 1 galaxies, while the cutoff energy (E${}_{\mathrm{c}}=108_{-10}^{+11}$ keV) falls within the range observed in Broad Line Seyfert 1 Galaxies. We measure a low-frequency lag that increases steadily with energy, while at high frequencies, there is a clear lag following the shape of the broad Fe K emission line. Interestingly, the observed Fe K lag in SWIFT J2127.4+5654 is not as broad as in other sources that have maximally spinning black holes. The lag amplitude suggests a continuum-to-reprocessor distance of about $10-20r_{\mathrm{g}}$. These timing results independently support an intermediate black hole spin and a compact corona.

11 pages, 10 figures, accepted for publication on MNRAS

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