HEAD 2000, November 2000
Session 1. Active Galaxies: Seyferts
Oral, Monday, November 6, 2000, 8:00-9:30am, Pago Pago Ballroom

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[1.04] Chandra HETGS Observation of an X-ray Ionization Cone in Mkn~3: Scattered Light from an Obscured Nucleus

M. Sako (Columbia), S. M. Kahn (Columbia), F. B. S. Paerels (Columbia), D. A. Liedahl (LLNL)

The high-resolution X-ray spectrum of the Seyfert 2 galaxy, Mkn~3, obtained with the High Energy Transmission Grating Spectrometer onboard the Chandra X-ray Observatory exhibits a wealth of discrete features produced in the circumsource medium. The high-energy spectrum is dominated by reflection of the AGN continuum radiation in a cold optically thick medium and contains bright K\alpha fluorescent lines from iron and silicon, as well as weak, blended lines from sulfur and magnesium. The soft X-ray emission is spatially extended along the O [{\small III}] ionization cone and shows discrete signatures of emission following recombination and photoexcitation produced in a warm photoionized region. The measured iron L line fluxes indicate that emission from collisionally ionized plasma is almost completely negligible, and does not contribute significantly to the total energy budget of the X-ray emission. We find that significant fractions of the H- and He-like resonance lines, as well as the observed iron L lines are produced through re-emission from the warm absorbing medium observed in Seyfert~1 galaxies. Its X-ray spectral properties are quantitatively consistent with those of a typical Seyfert~1 galaxy viewed at a different orientation, and provide further convincing evidence for the existence of an obscured Seyfert~1 nucleus in Mkn~3.

The author(s) of this abstract have provided an email address for comments about the abstract: masao@astro.columbia.edu

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