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Implications of the Warm Corona and Relativistic Reflection Models for the Soft Excess in Mrk 509
- Publication Year :
- 2019
- Publisher :
- American Astronomical Society, 2019.
-
Abstract
- We present the analysis of the first Nuclear Spectroscopic Telescope Array observations (~220 ks), simultaneous with the last Suzaku observations (~50 ks), of the active galactic nucleus of the bright Seyfert 1 galaxy Mrk 509. The time-averaged spectrum in the 1–79 keV X-ray band is dominated by a power-law continuum (Γ ~ 1.8–1.9), a strong soft excess around 1 keV, and signatures of X-ray reflection in the form of Fe K emission (~6.4 keV), an Fe K absorption edge (~7.1 keV), and a Compton hump due to electron scattering (~20–30 keV). We show that these data can be described by two very different prescriptions for the soft excess: a warm (kT ~ 0.5–1 keV) and optically thick (τ ~ 10–20) Comptonizing corona or a relativistically blurred ionized reflection spectrum from the inner regions of the accretion disk. While these two scenarios cannot be distinguished based on their fit statistics, we argue that the parameters required by the warm corona model are physically incompatible with the conditions of standard coronae. Detailed photoionization calculations show that even in the most favorable conditions, the warm corona should produce strong absorption in the observed spectrum. On the other hand, while the relativistic reflection model provides a satisfactory description of the data, it also requires extreme parameters, such as maximum black hole spin, a very low and compact hot corona, and a very high density for the inner accretion disk. Deeper observations of this source are thus necessary to confirm the presence of relativistic reflection and further understand the nature of its soft excess.
- Subjects :
- Physics
Active galactic nucleus
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
Astronomy and Astrophysics
Astrophysics
Photoionization
01 natural sciences
Galaxy
Accretion (astrophysics)
law.invention
Telescope
Absorption edge
Settore FIS/05 - Astronomia e Astrofisica
Space and Planetary Science
law
Ionization
0103 physical sciences
010303 astronomy & astrophysics
Electron scattering
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....fb6e268e2932d08a373f84d74e5b0201