Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926

We report on strong X-ray variability and the Fe K-band spectrum of the Seyfert galaxy IRAS 18325-5926 obtained from the 2001 XMM-Newton EPIC pn observation with a duration of ~120 ks. While the X-ray source is highly variable, the 8-10 keV band shows larger variability than that of the lower energi...

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Autores: Iwasawa, Kazushi, Fabian, A. C., Kara, E., Reynolds, C. S., Miniutti, G., Tombesi, F.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/142063
Acceso en línea:https://hdl.handle.net/2445/142063
Access Level:acceso abierto
Palabra clave:Galàxies actives
Raigs X
Active galaxies
X-rays
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spelling Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926Iwasawa, KazushiFabian, A. C.Kara, E.Reynolds, C. S.Miniutti, G.Tombesi, F.Galàxies activesRaigs XActive galaxiesX-raysWe report on strong X-ray variability and the Fe K-band spectrum of the Seyfert galaxy IRAS 18325-5926 obtained from the 2001 XMM-Newton EPIC pn observation with a duration of ~120 ks. While the X-ray source is highly variable, the 8-10 keV band shows larger variability than that of the lower energies. Amplified 8-10 keV flux variations are associated with two prominent flares of the X-ray source during the observation. The Fe K emission is peaked at 6.6 keV with moderate broadening. It is likely to originate from a highly ionized disc with an ionization parameter of log ξ ≃ 3. The Fe K line flux responds to the main flare, which supports its disc origin. A short burst of the Fe line flux has no relation to the continuum brightness, for which we have no clear explanation. We also find transient, blueshifted Fe K absorption features that can be identified with high-velocity (~0.2c) outflows of highly ionized gas, as found in other active galaxies. The deepest absorption feature appears only briefly (~1 h) at the onset of the main flare and disappears when the flare declines. The rapid evolution of the absorption spectrum makes this source peculiar among the active galaxies with high-velocity outflows. Another detection of the absorption feature also precedes the other flare. The variability of the absorption feature partly accounts for the excess variability in the 8-10 keV band where the absorption feature appears. Although no reverberation measurement is available, the black hole mass of ~2 × 106M⊙ is inferred from the X-ray variability. When this mass is assumed, the black hole is accreting at around the Eddington limit, which may fit the highly ionized disc and strong outflows observed in this galaxy.EDP Sciences2019201920162019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion9 p.application/pdfhttps://hdl.handle.net/2445/142063Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/201528030Astronomy & Astrophysics, 2016, vol. 592, p. A98https://doi.org/10.1051/0004-6361/201528030(c) The European Southern Observatory (ESO), 2016info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1420632026-05-29T05:05:01Z
dc.title.none.fl_str_mv Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
title Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
spellingShingle Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
Iwasawa, Kazushi
Galàxies actives
Raigs X
Active galaxies
X-rays
title_short Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
title_full Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
title_fullStr Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
title_full_unstemmed Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
title_sort Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926
dc.creator.none.fl_str_mv Iwasawa, Kazushi
Fabian, A. C.
Kara, E.
Reynolds, C. S.
Miniutti, G.
Tombesi, F.
author Iwasawa, Kazushi
author_facet Iwasawa, Kazushi
Fabian, A. C.
Kara, E.
Reynolds, C. S.
Miniutti, G.
Tombesi, F.
author_role author
author2 Fabian, A. C.
Kara, E.
Reynolds, C. S.
Miniutti, G.
Tombesi, F.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Galàxies actives
Raigs X
Active galaxies
X-rays
topic Galàxies actives
Raigs X
Active galaxies
X-rays
description We report on strong X-ray variability and the Fe K-band spectrum of the Seyfert galaxy IRAS 18325-5926 obtained from the 2001 XMM-Newton EPIC pn observation with a duration of ~120 ks. While the X-ray source is highly variable, the 8-10 keV band shows larger variability than that of the lower energies. Amplified 8-10 keV flux variations are associated with two prominent flares of the X-ray source during the observation. The Fe K emission is peaked at 6.6 keV with moderate broadening. It is likely to originate from a highly ionized disc with an ionization parameter of log ξ ≃ 3. The Fe K line flux responds to the main flare, which supports its disc origin. A short burst of the Fe line flux has no relation to the continuum brightness, for which we have no clear explanation. We also find transient, blueshifted Fe K absorption features that can be identified with high-velocity (~0.2c) outflows of highly ionized gas, as found in other active galaxies. The deepest absorption feature appears only briefly (~1 h) at the onset of the main flare and disappears when the flare declines. The rapid evolution of the absorption spectrum makes this source peculiar among the active galaxies with high-velocity outflows. Another detection of the absorption feature also precedes the other flare. The variability of the absorption feature partly accounts for the excess variability in the 8-10 keV band where the absorption feature appears. Although no reverberation measurement is available, the black hole mass of ~2 × 106M⊙ is inferred from the X-ray variability. When this mass is assumed, the black hole is accreting at around the Eddington limit, which may fit the highly ionized disc and strong outflows observed in this galaxy.
publishDate 2016
dc.date.none.fl_str_mv 2016
2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/142063
url https://hdl.handle.net/2445/142063
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/201528030
Astronomy & Astrophysics, 2016, vol. 592, p. A98
https://doi.org/10.1051/0004-6361/201528030
dc.rights.none.fl_str_mv (c) The European Southern Observatory (ESO), 2016
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory (ESO), 2016
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 9 p.
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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