0000000000529926

AUTHOR

Jiachen Jiang

showing 2 related works from this author

Accretion in strong field gravity with eXTP

2019

In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced 'spectral-timing-polarimetry' techniques to analyze the rapid variations with three orthogonal diagnostics of the flow and its geometry, yielding unprecedented insight into the inner accreting regions, the effects of strong field gravity on the material within them and the powerful outflows which are driven by the accretion process.

ACTIVE GALACTIC NUCLEIAccretionaccretion; black holes physics; X-ray; Physics and Astronomy (all)black holes physicAstronomyAstrophysics::High Energy Astrophysical PhenomenaBlack holes physicsPolarimetryFOS: Physical sciencesBLACK-HOLE SPINGeneral Physics and AstronomyStrong fieldAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesX-rayPhysics and Astronomy (all)ELECTROMAGNETIC EMISSIONSettore FIS/05 - Astronomia e Astrofisicablack holes physicsaccretion0103 physical sciencesAstrophysics::Solar and Stellar Astrophysics010306 general physics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)XMM-NEWTONPhysicsLENS-THIRRING PRECESSION[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]QUASI-PERIODIC OSCILLATIONS[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]IRON KAccretion (astrophysics)X ray[SDU]Sciences of the Universe [physics]ULTRA-FAST OUTFLOWSAstrophysics::Earth and Planetary AstrophysicsSPECTRAL FEATURESAstrophysics - High Energy Astrophysical Phenomena[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]X-RAY BINARIESScience China Physics, Mechanics & Astronomy
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The nature of the extreme X-ray variability in the NLS1 1H 0707-495

2021

We examine archival XMM-Newton data on the extremely variable narrow-line Seyfert 1 (NLS1) active galactic nucleus (AGN) 1H 0707-495. We construct fractional excess variance (Fvar) spectra for each epoch, including the recent 2019 observation taken simultaneously with eROSITA. We explore both intrinsic and environmental absorption origins for the variability in different epochs, and examine the effect of the photoionised emission lines from outflowing gas. In particular, we show that the unusual soft variability first detected by eROSITA in 2019 is due to a combination of an obscuration event and strong suppression of the variance at 1 keV by photoionised emission, which makes the variance …

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Active galactic nucleusAccretion (meteorology)Astrophysics::High Energy Astrophysical PhenomenaX-rayFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsLow frequencySpectral lineAmplitudeSpace and Planetary ScienceEmission spectrumAbsorption (electromagnetic radiation)Astrophysics - High Energy Astrophysical PhenomenaAstrophysics::Galaxy Astrophysics
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