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  Transient obscuration event captured in NGC 3227 - I. Continuum model for the broadband spectral energy distribution

Mehdipour, M., Kriss, G. A., Kaastra, J. S., Wang, Y., Mao, J., Costantini, E., et al. (2021). Transient obscuration event captured in NGC 3227 - I. Continuum model for the broadband spectral energy distribution. Astronomy and Astrophysics, 652: A150. doi:10.1051/0004-6361/202141324.

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Mehdipour, M., Author
Kriss, G. A., Author
Kaastra, J. S., Author
Wang, Y., Author
Mao, J., Author
Costantini, E., Author
Arav, N., Author
Behar, E., Author
Bianchi, S., Author
Branduardi-Raymont, G., Author
Brotherton, M., Author
Cappi, M., Author
Marco, B. De, Author
Gesu, L. Di, Author
Ebrero, J., Author
Grafton-Waters, S., Author
Kaspi, S., Author
Matt, G., Author
Paltani, S., Author
Petrucci, P.-O., Author
Pinto, C., AuthorPonti, G.1, Author              Ursini, F., AuthorWalton, D. J., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: From Swift monitoring of a sample of active galactic nuclei (AGN) we found a transient X-ray obscuration event in Seyfert-1 galaxy NGC 3227, and thus triggered our joint XMM-Newton, NuSTAR, and Hubble Space Telescope (HST) observations to study this event. Here in the first paper of our series we present the broadband continuum modelling of the spectral energy distribution for NGC 3227, extending from near infrared (NIR) to hard X-rays. We use our new spectra taken with XMM-Newton, NuSTAR, and the HST Cosmic Origins Spectrograph in 2019, together with archival unobscured XMM-Newton, NuSTAR, and HST Space Telescope Imaging Spectrograph data, in order to disentangle various spectral components of NGC 3227 and recover the underlying continuum. We find the observed NIR-optical-UV continuum is explained well by an accretion disk blackbody component (Tmax = 10 eV), which is internally reddened by E(B − V) = 0.45 with a Small Magellanic Cloud extinction law. We derive the inner radius (12 Rg) and the accretion rate (0.1 M yr−1) of the disk by modelling the thermal disk emission. The internal reddening in NGC 3227 is most likely associated with outflows from the dusty AGN torus. In addition, an unreddened continuum component is also evident, which likely arises from scattered radiation, associated with the extended narrow-line region of NGC 3227. The extreme ultraviolet continuum, and the ‘soft X-ray excess’, can be explained with a ‘warm Comptonisation’ component. The hard X-rays are consistent with a power-law and a neutral reflection component. The intrinsic bolometric luminosity of the AGN in NGC 3227 is about 2.2 × 1043 erg s−1 in 2019, corresponding to 3% Eddington luminosity. Our continuum modelling of the new triggered data of NGC 3227 requires the presence of a new obscuring gas with column density NH = 5 × 1022 cm−2, partially covering the X-ray source (Cf = 0.6).

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 Dates: 2021-08-26
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/202141324
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 652 Sequence Number: A150 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1