Volume 621, January 2019
|Number of page(s)||15|
|Published online||15 January 2019|
Photoionized emission and absorption features in the high-resolution X-ray spectra of NGC 3783
SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK
3 Leiden Observatory, Leiden University, Niels Bohrweg 2, 2300 RA Leiden, The Netherlands
4 Institute of Astronomy, University of Cambridge, Madingley Rd, Cambridge CB3 0HA, UK
5 Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK
6 Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel
7 Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
8 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
9 Max Planck Institute fur Extraterrestriche Physik, 85748 Garching, Germany
10 Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
11 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
12 Department of Astronomy, University of Geneva, 16 Ch. d’ Ecogia, 1290 Versoix, Switzerland
13 European Space Astronomy Centre, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
14 Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
Accepted: 27 November 2018
Our Swift monitoring program triggered two joint XMM-Newton, NuSTAR, and HST observations on 11 and 21 December 2016 targeting NGC 3783 because its soft X-ray continuum was heavily obscured. Consequently, emission features, including the O VII radiative recombination continuum, stand out above the diminished continuum. We focus on the photoionized emission features in the December 2016 Reflection Grating Spectrometer (RGS) spectra, and compare them to the time-averaged RGS spectrum obtained in 2000–2001 when the continuum was unobscured. A two-phase photoionized plasma is required to account for the narrow emission features. These narrow emission features are weakly varying between 2000–2001 and December 2016. We also find a statistically significant broad emission component in the time-averaged RGS spectrum in 2000–2001. This broad emission component is significantly weaker in December 2016, suggesting that the obscurer is farther away than the X-ray broad-line region. In addition, by analyzing the archival high-resolution X-ray spectra, we find that nine photoionized absorption components with different ionization parameters and kinematics are required for the warm absorber in X-rays.
Key words: X-rays: galaxies / galaxies: active / galaxies: Seyfert / galaxies: individual: NGC 3783 / techniques: spectroscopic
© ESO 2019
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