The Time-variable Ultraluminous X-Ray Sources of “The Antennae” | Zendy

G. Fabbiano | Zendy; A. Zezas | Zendy; A. R. King | Zendy; T. J. Ponman | Zendy; A. H. Rots | Zendy; F. Schweizer | Zendy

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The Time-variable Ultraluminous X-Ray Sources of “The Antennae”

Author(s) -

G. Fabbiano,

A. Zezas,

A. R. King,

T. J. Ponman,

A. H. Rots,

F. Schweizer

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/368174

Subject(s) - physics , astrophysics , luminosity , galaxy , black hole (networking) , x ray , binary number , astronomy , optics , computer network , routing protocol , routing (electronic design automation) , arithmetic , mathematics , computer science , link state routing protocol

We report the first results of the Chandra temporal monitoring of theultra-luminous X-ray sources (ULXs) in the Antennae galaxies (NGC 4038/39).Observations at four different epochs, covering time scales of 2 years to 2months, show variability in seven out of nine ULXs, confirming that they arelikely to be accreting compact X-ray binaries (XRBs). The seven variable ULXsexhibit a variety of temporal and spectral behaviors: one has harder X-raycolors 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 maybe black-hole binaries accreting at very high rates.Comment: 3 pages, 3 figures, 1 table In press in Ap. J. Letter

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