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  NuSTAR/XMM–Newton monitoring of the Seyfert 1 galaxy HE 1143-1810 - Testing the two-corona scenario

Ursini, F., Petrucci, P.-O., Bianchi, S., Matt, G., Middei, R., Marcel, G., et al. (2020). NuSTAR/XMM–Newton monitoring of the Seyfert 1 galaxy HE 1143-1810 - Testing the two-corona scenario. Astronomy and Astrophysics, 634: A92. doi:10.1051/0004-6361/201936486.

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Ursini, F., Author
Petrucci, P.-O., Author
Bianchi, S., Author
Matt, G., Author
Middei, R., Author
Marcel, G., Author
Ferreira, J., Author
Cappi, M., Author
Marco, B. De, Author
Rosa, A. De, Author
Malzac, J., Author
Marinucci, A., Author
Ponti, G.1, Author              
Tortosa, A., Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Aims. We test the two-corona accretion scenario for active galactic nuclei in the case of the “bare” Seyfert 1 galaxy HE 1143-1810. Methods. We perform a detailed study of the broad-band UV–X-ray spectral properties and of the short-term variability of HE 1143-1810. We present results of a joint XMM–Newton and NuSTAR monitoring of the source, consisting of 5 × 20 ks observations, each separated by 2 days, performed in December 2017. Results. The source is variable in flux among the different observations, and a correlation is observed between the UV and X-ray emission. Moderate spectral variability is observed in the soft band. The time-averaged X-ray spectrum exhibits a cut-off at ∼100 keV consistent with thermal Comptonization. We detect an iron Kα line consistent with being constant during the campaign and originating from a mildly ionized medium. The line is accompanied by a moderate, ionized reflection component. A soft excess is clearly present below 2 keV and is well described by thermal Comptonization in a “warm” corona with a temperature of ∼0.5 keV and a Thomson optical depth of ∼17 − 18. For the hot hard X-ray emitting corona, we obtain a temperature of ∼20 keV and an optical depth of ∼4 assuming a spherical geometry. A fit assuming a jet-emitting disc (JED) for the hot corona also provides a nice description of the broad-band spectrum. In this case, the data are consistent with an accretion rate varying between ∼0.7 and ∼0.9 in Eddington units and a transition between the outer standard disc and the inner JED at ∼20 gravitational radii. Conclusions. The broad-band high-energy data agree with an accretion flow model consisting of two phases: an outer standard accretion disc with a warm upper layer, responsible for the optical–UV emission and the soft X-ray excess, and an inner slim JED playing the role of a hard X-ray emitting hot corona.

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 Dates: 2020-02-12
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201936486
Other: LOCALID: 3222352
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 634 Sequence Number: A92 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1