The physical properties of the accretion flow and of the X-ray emitting plasma, in supermassive black holes accreting at extreme Eddington rates, are still very unclear. Here we present the analysis of simultaneous XMM-Newton and NuSTAR observations of the hyper-Eddington Seyfert 1 galaxy IRAS 04416+1215, carried out in 2020. The main goal of these observations is to investigate the properties of the X-ray corona, as well as the structure of the accretion flow and of the circumnuclear environment, in this regime of extreme accretion. IRAS 04416+1215 has one of the highest Eddington ratio (lambda(Edd) similar or equal to 472) in the local Universe. It shows an interesting spectral shape, very similar to the standard narrow-line Seyfert 1 galaxy's spectra, with the presence of multiphase absorption structure composed of three phases, whose estimate of the minimum and maximum distances suggests two different interpretations, one consistent with the three X-ray winds being cospatial, and possibly driven by magnetohydrodynamical processes, the other consistent with the multiphase winds being also multiscale. The X-ray spectrum of IRAS 04416+1215 also has a prominent soft excess component and a hard X-ray emission dominated by a reflection component. Moreover, our detailed spectral analysis shows that IRAS 04416+1215 has the lowest coronal temperature measured so far by NuSTAR (kT(e) = 3-22 keV, depending on the model). This is consistent with a hybrid coronal plasma, in which the primary continuum emission is driven by pair production due to high-energy tail of the energy distribution of non-thermal electrons.

Tortosa, A., Ricci, C., Tombesi, F., Ho, L.c., Du, P., Inayoshi, K., et al. (2022). The extreme properties of the nearby hyper-Eddington accreting active galactic nucleus in IRAS 04416+1215. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 509(3), 3599-3615 [10.1093/mnras/stab3152].

The extreme properties of the nearby hyper-Eddington accreting active galactic nucleus in IRAS 04416+1215

Tombesi F.;
2022-01-01

Abstract

The physical properties of the accretion flow and of the X-ray emitting plasma, in supermassive black holes accreting at extreme Eddington rates, are still very unclear. Here we present the analysis of simultaneous XMM-Newton and NuSTAR observations of the hyper-Eddington Seyfert 1 galaxy IRAS 04416+1215, carried out in 2020. The main goal of these observations is to investigate the properties of the X-ray corona, as well as the structure of the accretion flow and of the circumnuclear environment, in this regime of extreme accretion. IRAS 04416+1215 has one of the highest Eddington ratio (lambda(Edd) similar or equal to 472) in the local Universe. It shows an interesting spectral shape, very similar to the standard narrow-line Seyfert 1 galaxy's spectra, with the presence of multiphase absorption structure composed of three phases, whose estimate of the minimum and maximum distances suggests two different interpretations, one consistent with the three X-ray winds being cospatial, and possibly driven by magnetohydrodynamical processes, the other consistent with the multiphase winds being also multiscale. The X-ray spectrum of IRAS 04416+1215 also has a prominent soft excess component and a hard X-ray emission dominated by a reflection component. Moreover, our detailed spectral analysis shows that IRAS 04416+1215 has the lowest coronal temperature measured so far by NuSTAR (kT(e) = 3-22 keV, depending on the model). This is consistent with a hybrid coronal plasma, in which the primary continuum emission is driven by pair production due to high-energy tail of the energy distribution of non-thermal electrons.
2022
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Con Impact Factor ISI
accretion; accretion discs; black hole physics; galaxies: active; galaxies: nuclei; galaxies: Seyfert; X-rays: galaxies
Tortosa, A., Ricci, C., Tombesi, F., Ho, L.c., Du, P., Inayoshi, K., et al. (2022). The extreme properties of the nearby hyper-Eddington accreting active galactic nucleus in IRAS 04416+1215. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 509(3), 3599-3615 [10.1093/mnras/stab3152].
Tortosa, A; Ricci, C; Tombesi, F; Ho, Lc; Du, P; Inayoshi, K; Wang, J-; Shangguan, J; Li, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/300701
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