Journal
ASTROPHYSICAL JOURNAL
Volume 576, Issue 1, Pages L19-L23Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/342977
Keywords
galaxies : active; galaxies : individual (NGC 253); galaxies : nuclei; galaxies : starburst; X-rays : galaxies
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Chandra observations of the core of the nearby starburst galaxy NGC 253 reveal a heavily absorbed source of hard X-rays embedded within the nuclear starburst region. The source has an unabsorbed, 2-10 keV luminosity of greater than or equal to10(39) ergs s(-1) and photoionizes the surrounding gas. We observe this source through a dusty torus with a neutral absorbing column density of N-H similar to 2 x 10(23) cm(-2). The torus is hundreds of parsecs across and collimates the starburst-driven nuclear outflow. We suggest that the ionizing source is an intermediate-mass black hole or a weakly accreting supermassive black hole, which may signal the beginnings or endings of active galactic nucleus activity.
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