4.7 Article

X-ray emission from the nucleus of the dwarf elliptical galaxy NGC 3226

Journal

ASTROPHYSICAL JOURNAL
Volume 559, Issue 1, Pages 167-172

Publisher

UNIV CHICAGO PRESS
DOI: 10.1086/322389

Keywords

galaxies : active; galaxies : dwarf; galaxies : individual (NGC 3226); galaxies : nuclei; X-rays : binaries; X-rays : galaxies

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We present the first high-resolution X-ray image of the dwarf elliptical galaxy NGC 3226. The data were obtained during an observation of the nearby Seyfert Galaxy NGC 3227 using the Chandra X-Ray Observatory. We detect a point X-ray source spatially consistent with the optical nucleus of NGC 3226 and a recently detected, compact, flat-spectrum radio source. The X-ray spectrum can be measured up to similar to 10 keV and is consistent with a power law with a photon index 1.7 less than or similar to Gamma less than or similar to 2.2 or thermal bremsstrahlung emission with 4 keV less than or similar to kT less than or similar to 10 keV. In both cases, the luminosity in the 2-10 keV band similar or equal to 10(40) h(75)(-1) ergs s(-1). We find marginal evidence that the nucleus varies within the observation. These characteristics support evidence from other wave bands that NGC 3226 harbors a low-luminosity active nucleus. We also comment on two previously unknown, fainter X-ray sources less than or similar to 15 from the nucleus of NGC 3226. Their proximity to the nucleus (with projected distances of less than or similar to 1.3 h(75)(-1) kpc) suggests both are within NGC 3226 and thus have luminosities (approximately a few times 10(38) to a few times 10(39) ergs s(-1)) consistent with black hole binary systems.

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