| Issue |
A&A
Volume 425, Number 1, October I 2004
|
|
|---|---|---|
| Page(s) | 95 - 98 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20041253 | |
| Published online | 10 September 2004 | |
High resolution Chandra X-ray imaging of the nucleus of M 33
1
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
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
© ESO, 2004
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