The exceptional X-ray properties of the NLSy1 galaxy RXJ 0134.3-4258

Abstract

The Narrow-line Seyfert 1 galaxy RXJ0134.3-4258 was detected during the ROSAT all-sky survey with an ultrasoft spectrum (Greiner 1996). Our later pointed observation led to the discovery of drastic spectral variability. Here, we present the first detailed analysis of the soft X-ray properties of this peculiar source.

4 pages incl. 2 figures (needs crckapb.sty); contribution to the proc. of `Astrophysical Dynamics' (Evora, April 14-16, 1999), to appear in Ap&SS; Preprint and related papers on RXJ0134.3-4258 are available at http://www.xray.mpe.mpg.de/~skomossa/