HEAD 2000, November 2000
Session 24. X-Ray Binaries - Timing and Transients
Display, Wednesday, November 8, 2000, 8:00am-6:00pm, Bora Bora Ballroom

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[24.13] Detection of a Strong Soft X-ray Transient Near the Nucleus of Centaurus A

H. Steinle (MPE)

During five ROSAT HRI observations in July 1995, a bright X-ray source (designated 1RXH~J132519.8-430312) was detected 2.5 arcmin south-west of the nucleus of NGC~5128 (Centaurus~A) at the outer regions of the elliptical galaxy.

At that time it was the brightest point source in the ROSAT HRI field-of-view. All other ROSAT observations made before and after this observations show no trace of the source suggesting that this is a highly variable object. Chandra observations of Cen~A made in September 1999 show a source at the ROSAT position, which may be the quiescent counterpart of the transient. It is very probable that the transient is located in NGC~5128.

Given the existence of a transient source that close to the direction of NGC~5128, all observations (at least in soft X-rays) of Cen~A, with instruments of low spatial resolution, should take the variability of this object into account.

The author(s) of this abstract have provided an email address for comments about the abstract: hcs@mpe.mpg.de

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