The Time-variable Ultraluminous X-Ray Sources of “The Antennae”
- 10 February 2003
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 584 (1) , L5-L8
- https://doi.org/10.1086/368174
Abstract
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 ratesKeywords
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