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Astron. Astrophys. 324, L77-L80

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Letter to the Editor

Soft X-ray observations of the complex warm absorber
in MCG-6-30-15 with BeppoSAX

Astrid Orr1, S. Molendi2, F. Fiore3, P. Grandi4, A.N. Parmar1, and Alan Owens1

1Astrophysics Division, Space Science Department of ESA, ESTEC, P.O. Box 299, 2200 AG Noordwijk, The Netherlands
2Instituto di Fisica Cosmica e Tecnologie Relative C.N.R., Via Bassini 15, I-20133 Milano, Italy
3BeppoSAX Science Data Center, c/o Nuova Telespazio, Via Corcolle 19, I-00131 Roma, Italy
4Instituto di Astrofisica Spaziale C.N.R., Via Enrico Fermi 21-23, I-00044 Frascati, Italy

Received 13 May 1997 / Accepted 10 June 1997


We report on soft X-ray observations of the Seyfert 1 galaxy MCG-6-30-15 with the Low and Medium Energy Concentrator Spectrometers on board BeppoSAX. The time averaged 0.1-4 keV spectrum shows evidence for a complex warm absorber. K-edges of highly ionized oxygen (O VII and O VIII) can only partly describe the soft X-ray spectrum below 2 keV. A spectral variability study reveales large and rapid changes in absorption at the energy of the O VIII K-edge and in the continuum shape and count rate. These fluctuations are not simply correlated.

Key words: Galaxies: individual: (MCG-6-30-15) - Galaxies: Seyfert - X-rays: galaxies

Send offprint requests to: A. Orr: aorr@astro.estec.esa.nl

© European Southern Observatory (ESO) 1997