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A&A 425, 95-98 (2004)
DOI: 10.1051/0004-6361:20041253
High resolution Chandra X-ray imaging of the nucleus of M 33
G. Dubus1, 2, P. A. Charles3 and K. S. Long41 Laboratoire Leprince-Ringuet, École Polytechnique, 91128 Palaiseau, France
e-mail: gd@poly.in2p3.fr
2 Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75013 Paris, France
3 Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK
4 Space Telescope Science Institute, 3700 San Martin Dr., Baltimore MD 21218, USA
(Received 7 May 2004 / Accepted 4 June 2004 )
Abstract
We show with a short Chandra HRC-S exposure that the
powerful X-ray source coincident with the nucleus of M 33 is
unresolved at the highest spatial resolution available to date
(0
4). The source flux is variable, doubling during the 5 ks
exposure. The combination of properties exhibited by M 33 X-8
establishes the source as the nearest example of the
ultra-luminous X-ray sources that have been uncovered in other
nearby galaxies. On short timescales, we set limits of 9% rms
variability for pulsations in the 0.01-1000 Hz range.
Key words: galaxies: individual: M 33 -- galaxies: nuclei -- galaxies: Local Group -- X-rays: galaxies
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