Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra.pdfVIP

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Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra.pdf

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Discovery of a binary AGN in the ultraluminous infrared galaxy NGC 6240 using Chandra

a r X i v : a s t r o - p h / 0 2 1 2 0 9 9 v 1 4 D e c 2 0 0 2 ApJ Letters, in press (scheduled for January 1, 2003) Discovery of a binary AGN in the ultraluminous infrared galaxy NGC6240 using Chandra St. Komossa1, V. Burwitz1, G. Hasinger1, P. Predehl1, J.S. Kaastra2, Y. Ikebe3 1Max-Planck-Institut fu?r extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany, skomossa@xray.mpe.mpg.de; 2SRON National Institute for Space Research, Sorbonnelaan 2, 3584 Utrecht, The Netherlands; 3Joint Center for Astrophysics, Physics Department, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250, USA ABSTRACT Ultraluminous infrared galaxies (ULIRGs) are outstanding due to their huge luminosity output in the infrared, which is predominantly powered by super starbursts and/or hidden active galactic nuclei (AGN). NGC6240 is one of the nearest ULIRGs and is considered a key representative of its class. Here, we report the first high-resolution imaging spectroscopy of NGC6240 in X-rays. The observation, performed with the ACIS-S detector aboard the Chandra X-ray observatory, led to the discovery of two hard nuclei, coincident with the optical-IR nuclei of NGC6240. The AGN character of both nuclei is revealed by the detection of absorbed hard, luminous X-ray emission and two strong neutral FeKα lines. In addition, extended X-ray emission components are present, changing their rich structure in dependence of energy. The close correlation of the extended emission with the optical Hα emission of NGC6240, in combination with the softness of its spectrum, clearly indicates its relation to starburst-driven superwind activity. Subject headings: quasars: individual (NGC 6240) — X–rays: galaxies 1. Introduction Ultraluminous infrared galaxies (ULIRGs) are characterized by their huge luminosity output in the infrared, which is predominantly powered by super-starbursts and/or hidden AGN (e.g., Genzel et al. 1998, Sanders 1999). Many distant