Volume 425, Number 1, October I 2004
|Page(s)||95 - 98|
|Published online||10 September 2004|
High resolution Chandra X-ray imaging of the nucleus of M 33
Laboratoire Leprince-Ringuet, École Polytechnique, 91128 Palaiseau, France e-mail: email@example.com
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
Accepted: 4 June 2004
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 (04). 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
© ESO, 2004
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