Investigating the Properties of the Relativistic Jet and Hot Corona in AGN with X-ray Polarimetry
Galaxies(2024)
摘要
X-ray polarimetry has been suggested as a prominent tool for investigating
the geometrical and physical properties of the emissions from active galactic
nuclei (AGN). The successful launch of the Imaging X-ray Polarimetry Explorer
(IXPE) on 9 December 2021 has expanded the previously restricted scope of
polarimetry into the X-ray domain, enabling X-ray polarimetric studies of AGN.
Over a span of two years, IXPE has observed various AGN populations, including
blazars and radio-quiet AGN. In this paper, we summarize the remarkable
discoveries achieved thanks to the opening of the new window of X-ray
polarimetry of AGN through IXPE observations. We will delve into two primary
areas of interest: first, the magnetic field geometry and particle acceleration
mechanisms in the jets of radio-loud AGN, such as blazars, where the
relativistic acceleration process dominates the spectral energy distribution;
and second, the geometry of the hot corona in radio-quiet AGN. Thus far, the
IXPE results from blazars favor the energy-stratified shock acceleration model,
and they provide evidence of helical magnetic fields inside the jet. Concerning
the corona geometry, the IXPE results are consistent with a disk-originated
slab-like or wedge-like shape, as could result from Comptonization around the
accretion disk.
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