期刊
ASTRONOMY & ASTROPHYSICS
卷 425, 期 1, 页码 95-98出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20041253
关键词
galaxies : individual : M 33; galaxies : nuclei; galaxies : Local Group; X-rays : galaxies
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.
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