Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-03
Astron. Astrophys. 357, L57-L60 (2000)
Astronomy and Astrophysics
Astrophysics
accepted for Astron. Astrophys. Lett. in April 2000; more info at http://www.mpe.mpg.de/Cen-A/
Scientific paper
During five ROSAT HRI observations in July 1995, a bright X-ray source (designated 1RXH J132519.8-430312) was detected 2.5' 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 these 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, must take the presence and variability of this object into account.
Dennerl Konrad
Englhauser Jakob
Steinle Helmut
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