Publications (12)
Polarization properties of thermal accretion disk emission. I. Direct radiation
L. Marra, J. Podgorný, R. Taverna +4
The X-ray polarimetric observing window re-opening is shedding new light on our current understanding of compact accreting sources. This is true, in particular, for stellar-mass bl…
Thick turbulent gas disks with magnetocentrifugal winds in active galactic nuclei - Model infrared emission and optical polarization
B. Vollmer, M. Schartmann, L. Burtscher +4
(Abridged) Infrared high-resolution imaging and interferometry have shown that the dust distribution is frequently elongated along the polar direction of an AGN. To explain these f…
Flare-induced fountains and buried flares in AGN
B. Czerny, R. Goosmann
We discuss the local physical changes at the surface of an AGN accretion disk after the onset of a magnetic flare. The X-ray irradiation by a flare creates a hot spot at the disk s…
Constraining the geometry and kinematics of the quasar broad emission line region using gravitational microlensing. I. Models and simulations
L. Braibant, D. Hutsemékers, D. Sluse +1
Recent studies have shown that line profile distortions are commonly observed in gravitationally lensed quasar spectra. We investigate the effect of gravitational microlensing on q…
The Microchannel X-ray Telescope on Board the SVOM Satellite
D. Gotz, C. Adami, S. Basa +18
We present the Micro-channel X-ray Telescope (MXT), a new narrow-field (about 1°) telescope that will be flying on the Sino-French SVOM mission dedicated to Gamma-Ray Burst scienc…
Understanding Active Galactic Nuclei using near-infrared high angular resolution polarimetry II: Preliminary results
F. Marin, L. Grosset, R. Goosmann +5
In this second research note of a series of two, we present the first near-infrared results we obtained when modeling Active Galactic Nuclei (AGN). Our first proceedings showed the…
Constraining the geometry and kinematics of the quasar broad emission line region using gravitational microlensing. II. Comparing models with observations in the lensed quasar HE0435-1223
D. Hutsemékers, L. Braibant, D. Sluse +1
The quadruply lensed quasar HE0435-1223 shows a clear microlensing effect that affects differently the blue and red wings of the H line profile in its image D. To interpret the…
X-ray polarization of reflected thermal emission
J. Podgorný, M. DovÄiak, R. Goosmann +5
We compute rest-frame reflection spectra and the corresponding energy-dependent linear polarization degree and angle for (un)polarized single-temperature blackbody spectra impingin…
AGN Black hole mass estimates using polarization in broad emission Lines
Ä. SaviÄ, R. Goosmann, L. Ä. PopoviÄ +2
The innermost regions in active galactic nuclei (AGNs) were not being spatially resolved so far but spectropolarimetry can provide us insight about their hidden physics and the geo…
Radio Quiet AGN
B. Czerny, R. Goosmann, V. Karas +1
Active Galactic Nuclei are powered by accretion onto massive black holes. Although radio-quiet objects are not as spectacular sources of very high energy photons as radio-loud ones…
The flare model for X-ray variability of NGC 4258
T. Trzesniewski, B. Czerny, V. Karas +4
We study the variability mechanism of active galactic nuclei (AGN) within the framework of the flare model. To this end we examine the case of Seyfert/LINER galaxy NGC 4258, which…
Modeling the Warm Absorber in AGN
A. Rozanska, R. Goosmann, A. -M. Dumont +1
We present a wide grid of models for the structure and transmission properties of warm absorbers in active galactic nuclei (AGN). Contrary to commonly used constant density models,…