Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-12
Astrophys.J.Suppl. 142 (2002) 239-260
Astronomy and Astrophysics
Astrophysics
27 pages, 9 figures, submitted to ApJS
Scientific paper
10.1086/342010
We report the detailed analysis of the X-ray properties of the discrete sources detected in a long (72 ks) \chandra ACIS-S observation of the Antennae galaxies. We detect 49 sources, down to a detection limit of ~ 10^{38} erg\s; 18 sources have Lx >10^{39} erg\s (Ultra Luminous X-ray sources; ULXs). Six of the 49 sources have an extended component. Two sources show evidence for variability during this observation, and three sources exhibit long term variability in timescales of a few years. The spectra of the discrete sources are diverse, suggesting different emission mechanisms, broadly correlated with the source luminosity: the most luminous sources exhibit harder emission, while the spectra of fainter sources appear softer. Spectra and variability suggest that the ULXs may be binary accretion sources; Supernova remnants or hot ISM in the Chandra beam may be responsible for some of the softer sources.
Fabbiano Giuseppina
Murray Stephen S.
Rots Arnold H.
Zezas Andreas
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