A deep X-ray view of the bare AGN Ark 120 VI. Geometry of the hot corona from spectroscopic and polarization signatures

0518344 - ASÚ 2020 RIV FR eng J - Journal Article
Marinucci, M. - Porquet, D. - Tamborra, Francesco - Bianchi, S. - Braito, V. - Lobban, A. - Marin, F. - Matt, G. - Middei, R. - Nardini, E. - Reeves, J.N. - Tortosa, A.
A deep X-ray view of the bare AGN Ark 120 VI. Geometry of the hot corona from spectroscopic and polarization signatures.
Astronomy & Astrophysics. Roč. 623, February (2019), č. článku A12. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : black hole physics * polarization * active galaxies
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.636, year: 2019
Method of publishing: Limited access
https://doi.org/10.1051/0004-6361/201834454

A general agreement is found between the best fit values of the hot coronal parameters obtained with MoCA and the ones inferred using other Comptonisation codes from the literature. The expected polarization signal from the best fits with MoCA is then presented and discussed, in view of the launch in 2021 of the Imaging X-ray Polarimetry Explorer (IXPE). We find that none of the tested geometries for the hot corona (extended slab and extended/compact spheroids) can be statistically preferred, based on spectroscopy solely. In the future, an IXPE observation less than 1 Ms long will clearly distinguish between an extended slab or a spherical hot corona.

Permanent Link: http://hdl.handle.net/11104/0303503