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THE COMPLEX CIRCUMNUCLEAR ENVIRONMENT of the BROAD-LINE RADIO GALAXY 3C 390.3 REVEALED by CHANDRA HETG

Accepted version
Peer-reviewed

Type

Article

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Abstract

jats:titleABSTRACT</jats:title> jats:pWe present the first high spectral resolution X-ray observation of the broad-line radio galaxy 3C 390.3 obtained with the high-energy transmission grating spectrometer on board the jats:italicChandra</jats:italic> jats:italic X-ray Observatory</jats:italic>. The spectrum shows complex emission and absorption features in both the soft X-rays and Fe K band. We detect emission and absorption lines in the energy range jats:italicE</jats:italic> = 700–1000 eV associated with ionized Fe L transitions (Fe XVII–XX). An emission line at the energy of jats:italicE</jats:italic> ≃ 6.4 keV consistent with the Fe Kjats:italicα</jats:italic> is also observed. Our best-fit model requires at least three different components: (i) a hot emission component likely associated with the hot interstellar medium in this elliptical galaxy with temperature jats:italickT</jats:italic> = 0.5 ± 0.1 keV; (ii) a warm absorber with ionization parameter logjats:italicξ</jats:italic> = 2.3 ± 0.5 erg sjats:sup−1</jats:sup> cm, column density logjats:italicN</jats:italic> jats:subH</jats:sub> = 20.7 ± 0.1 cmjats:sup−2</jats:sup>, and outflow velocity jats:italicv</jats:italic> jats:subout</jats:sub> < 150 km sjats:sup−1</jats:sup>; and (iii) a lowly ionized reflection component in the Fe K band likely associated with the optical broad-line region or the outer accretion disk. These evidences suggest the possibility that we are looking directly down the ionization cone of this active galaxy and that the central X-ray source only photoionizes along the unobscured cone. This is overall consistent with the angle-dependent unified picture of active galactic nuclei.</jats:p>

Description

Keywords

black hole physics, galaxies: active, line: identification, X-rays: galaxies

Journal Title

Astrophysical Journal

Conference Name

Journal ISSN

0004-637X
1538-4357

Volume Title

830

Publisher

American Astronomical Society