The Time-Variable Ultra-Luminous X-ray Sources of "The Antennae"

Details The Time-Variable Ultra-Luminous X-ray Sources of "The Antennae" The Time-Variable Ultra-Luminous X-ray Sources of "The Antennae"

2002-12-19

arxiv.org/abs/astro-ph/0212437v1

Astrophys.J. 584 (2003) L5-L8

Astronomy and Astrophysics

Astrophysics

3 pages, 3 figures, 1 table In press in Ap. J. Letters

Scientific paper

10.1086/368174

We report the first results of the Chandra temporal monitoring of the ultra-luminous X-ray sources (ULXs) in the Antennae galaxies (NGC 4038/39). Observations at four different epochs, covering time scales of 2 years to 2 months, show variability in seven out of nine ULXs, confirming that they are likely to be accreting compact X-ray binaries (XRBs). The seven variable ULXs exhibit a variety of temporal and spectral behaviors: one has harder X-ray colors with decreasing luminosity, similar to the black hole binary Cyg X-1, but four other ULXs show the opposite behavior. We suggest that the latter may be black-hole binaries accreting at very high rates.

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