Anatomy of the AGN in NGC 5548: V. A clear view of the X-ray narrow emission lines
M. Whewell, G. Branduardi-Raymont, J.S. Kaastra, M. Mehdipour, K.C., Steenbrugge, S. Bianchi, E. Behar, J. Ebrero, M. Cappi, E. Costantini, B. De, Marco, L. Di Gesu, G.A. Kriss, S. Paltani, B.M. Peterson, P. -O Petrucci, C., Pinto, G. Ponti

TL;DR
This study provides a detailed analysis of the narrow emission lines in the X-ray spectrum of NGC 5548, revealing the physical conditions and location of the emitting gas using high-resolution data and photoionisation models.
Contribution
It offers the first comprehensive modeling of the X-ray narrow-line region in NGC 5548, including physical parameters and spatial location of the emitting clouds.
Findings
X-ray narrow-line region is absorbed by warm absorber components.
The emitting gas is photoionised with a temperature of a few eV.
The distance to the emitting clouds is estimated at approximately 14 parsecs.
Abstract
Context. Our consortium performed an extensive multi-wavelength campaign of the nearby Seyfert 1 galaxy NGC 5548 in 2013-14. The source appeared unusually heavily absorbed in the soft X-rays, and signatures of outflowing absorption were also present in the UV. He-like triplets of neon, oxygen and nitrogen, and radiative recombination continuum (RRC) features were found to dominate the soft X-ray spectrum due to the low continuum flux. Aims. Here we focus on characterising these narrow emission features using data obtained from the XMM-Newton RGS (770 ks stacked spectrum). Methods. We use SPEX for our initial analysis of these features. Self-consistent photoionisation models from Cloudy are then compared with the data to characterise the physical conditions of the emitting region. Results. Outflow velocity discrepancies within the O VII triplet lines can be explained if the X-ray…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · X-ray Spectroscopy and Fluorescence Analysis · Galaxies: Formation, Evolution, Phenomena
