Search results for "Soft x ray"

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Testing warm Comptonization models for the origin of the soft X-ray excess in AGNs

2018

The X-ray spectra of many active galactic nuclei (AGN) show a soft X-ray excess below 1-2 keV on top of the extrapolated high- energy power law. The origin of this component is uncertain. It could be a signature of relativistically blurred, ionized reflection, or the high-energy tail of thermal Comptonization in a warm (kT $\sim$ 1 keV), optically thick ($\tau\simeq$ 10-20) corona producing the optical/UV to soft X-ray emission. The purpose of the present paper is to test the warm corona model on a statistically significant sample of unabsorbed, radio-quiet AGN with XMM-newton archival data, providing simultaneous optical/UV and X-ray coverage. The sample has 22 objects and 100 observations…

galaxie [X-rays]Seyfert [Galaxies]Active galactic nucleusactive [Galaxies][ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph]Astrophysics::High Energy Astrophysical Phenomenagalaxies: activeFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics7. Clean energy01 natural sciencesPower lawSpectral lineAccretion discIonization0103 physical sciencesThermalAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Soft x ray010308 nuclear & particles physicsAstronomy and AstrophysicsAstronomy and AstrophysicGalaxygalaxies: SeyfertX-rays: galaxiesSpace and Planetary Science[SDU]Sciences of the Universe [physics]Astrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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