An XMM-Newton observation of the Seyfert 1 galaxy 1H 0419-577 in an extreme low state

Abstract

Previous observations of the luminous Seyfert 1 galaxy 1H 0419-577 have found its X-ray spectrum to range from that of a typical Seyfert 1 with 2-10 keV power law index Gamma ~ 1.9 to a much flatter power law of Gamma ~ 1.5 or less. We report here a new XMM-Newton observation which allows the low state spectrum to be studied in much greater detail than hitherto. We find a very hard spectrum (Gamma ~ 1.0), which exhibits broad features that can be modelled with the addition of an extreme relativistic Fe K emission line or with partial covering of the underlying continuum by a substantial column density of near-neutral gas. Both the EPIC and RGS data show evidence for strong line emission of OVII and OVIII requiring an extended region of low density photoionised gas in 1H 0419-577. Comparison with an earlier XMM-Newton observation when 1H 0419-577 was 'X-ray bright' indicates the dominant spectral variability occurs via a steep power law component.

arXiv comment25 pages, 8 figures, accepted by ApJ

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• X-ray reflection in the Seyfert galaxy 1H0419-577 revealing strong relativistic effects in the vicinity of a Kerr black hole
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• Revealing the X-ray Variability of AGN with Principal Component Analysis
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• A Relativistic Disc Reflection Model for 1H0419-577: Multi-Epoch Spectral Analysis with XMM-Newton and NuSTAR
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• Simultaneous XMM-\textit{Newton} and HST-COS observation of 1H0419-577: II. Broadband spectral modeling of a variable Seyfert galaxy
• Simultaneous XMM-Newton and HST-COS observation of 1H0419-577: the absorbing and emitting ionized gas
• Long-term X-ray stability and UV variability of the ionized absorption in NGC 3783
• Measuring Light Echos in NGC 4051
• On the Nature of the High-Energy Rollover in 1H 0419-577
• Variable X-ray reflection from 1H~0419--577
• Chandra imaging of the $\sim$kpc extended outflow in 1H 0419-577
• Complex Optical/UV and X-ray Variability of the Seyfert 1 galaxy 1H 0419-577
• Simple interpretation of the seemingly complicated X-ray spectral variation of NGC 5548
• A possible two-fold scenario for the disc-corona of the luminous AGN 1H 0419--577: a high-density disc or a warm corona