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Astron. Astrophys. 341, L27-L30 (1999)

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Letter to the Editor

BeppoSAX confirms extreme relativistic effects in the X-ray spectrum of MCG-6-30-15

M. Guainazzi 1, G. Matt 2, S. Molendi 3, A. Orr 1, F. Fiore 4,5, P. Grandi 6, A. Matteuzzi 5, T. Mineo 7, G.C. Perola 2, A.N. Parmar 1 and L. Piro 6

1 Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2 Dipartimento di Fisica "E.Amaldi", Università degli Studi "Roma Tre", Via della Vasca Navale 84, I-00146 Roma, Italy
3 Istituto di Fisica Cosmica "G.Occhialini", CNR, Via Bassini 15, I-20133 Milano, Italy
4 Osservatorio Astronomico di Roma, Via dell'Osservatorio, I-00144 Monteporzio Catone, Italy
5 BeppoSAX Science Data Center, Via Corcolle 19, I-00131 Roma, Italy
6 Istituto di Astrofisica Spaziale CNR, Via Fosso del Cavaliere, I-00133 Roma, Italy
7 Istituto di Fisica Cosmica ed Applicazioni dell'Informatica CNR, Via Ugo La Malfa 153, I-90146 Palermo, Italy

Received 27 October 1998 / Accepted 17 November 1998

Abstract

We report in this Letter the first simultaneous measure of the X-ray broadband (0.1-200 keV) continuum and of the iron [FORMULA] fluorescent line profile in the Seyfert 1 galaxy MCG-6-30-15. Our data confirms the ASCA detection of a skewed and redshifted line profile (Tanaka et al. 1995). The most straightforward explanation is that the line photons are emitted in the innermost regions of a X-ray illuminated relativistic disk. The line Equivalent Width ([FORMULA] eV) is perfectly consistent with the expected value for solar abundances, given the observed amount of Compton reflection. We report also the discovery of a cut-off in the nuclear primary emission at the energy of [FORMULA]160 keV.

Key words: accretion, accretion disks – line: formation – line: profiles – galaxies: individual: MCG-6-30-15 – galaxies: Seyfert – X-rays: general

Send offprint requests to: M. Guainazzi (mguainaz@astro.estec.esa.nl)

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© European Southern Observatory (ESO) 1999

Online publication: December 4, 1998
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