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H1320+551: A type 1.8/1.9 Seyfert galaxy with an unabsorbed X-ray spectrum

AuthorsBarcons, Xavier ; Carrera, Francisco J. ; Ceballos, María Teresa
KeywordsX-rays: galaxies
Galaxies: Seyfert
Galaxies: active
Issue Date2003
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 339(3): 757-764 (2003)
AbstractWe present new optical spectroscopic and XMM-Newton X-ray observations of the active galactic nucleus (AGN) H1320+551. The optical data (consistent with but of better quality than a previously published spectrum) show this source to be a type 1.8/1.9 Seyfert galaxy at z = 0.0653. The narrow-line region is significantly reddened, with a Balmer decrement Hα/Hβ ∼ 6, and the broad-line region, with a barely detectable Hβ broad component, shows a much pronounced Balmer decrement (Hα/Hβ > 27). In spite of this, the EPIC pn X-ray spectrum exhibits a power-law continuum with a soft excess that is well fitted by a blackbody, with no photoelectric absorption above the Galactic value. An Fe K emission line is also seen at a rest-frame energy ∼6.5 keV with an equivalent width of ∼400 eV, far too weak for the source to be Compton-thick. Reconciling the optical and X-ray data requires the narrow-line region to be internally reddened but with small covering factor over the nuclear emission, and the Balmer decrement of the broad-line region to be an intrinsic property rather than caused by reddening/absorption. The H1320+551 type 1.8/1.9 Seyfert galaxy is not consistent with being an obscured type 1 Seyfert nucleus, i.e. it does not match the basic AGN unified scheme hypothesis.
Publisher version (URL)https://doi.org/10.1046/j.1365-8711.2003.06238.x
Identifiersdoi: 10.1046/j.1365-8711.2003.06238.x
issn: 0035-8711
e-issn: 1365-2966
Appears in Collections:(IFCA) Artículos
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