Astron. Astrophys. 363, 863-868 (2000)

The BeppoSAX observation of Mrk 766

G. Matt ¹, G.C. Perola ¹, F. Fiore ^2,3,4, M. Guainazzi ⁵, F. Nicastro ^2,3,6 and L. Piro <sup>6

1</sup> Università degli Studi Roma Tre, Dipartimento di Fisica, Via della Vasca Navale 84, 00146 Roma, Italy
² Osservatorio Astronomico di Roma, Via dell' Osservatorio, 00044 Monteporzio Catone, Italy
³ Harvard-Smithsonian Center of Astrophysics, 60 Garden Street, Cambridge MA 02138, USA
⁴ SAX/SDC Nuova Telespazio, Via Corcolle 19, 00131 Roma, Italy
⁵ XMM SOC, VILSPA-ESA, Apartado 50727, 28080 Madrid, Spain
⁶ Istituto di Astrofisica Spaziale, C.N.R., Via Fosso del Cavaliere, 00133 Roma, Italy

Received 28 April 2000 / Accepted 19 September 2000

Abstract

The Narrow Line Seyfert 1 galaxy Mrk 766 has been observed by BeppoSAX on May 1997. The source was fairly variable, both in flux and spectrum, during the observation. The variability is the largest around 2 keV, possibly due to variations in the warm absorber properties. An oxygen line is clearly detected, at least in the first part of the observation. An edge around 7.5 keV, coupled with the lack of any detectable iron line, suggests either reprocessing of the primary X-rays by a mildly ionized disc or absorption by a further, thicker and more ionized material.

Key words: galaxies: individual: Mrk 766 galaxies: Seyfert X-rays: galaxies

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observation and data reduction
• 3. Data analysis and results. Temporal analysis
• 4. Data analysis and results. Spectral analysis
  • 4.1. First half of the observation
    • 4.1.1. The warm absorber
    • 4.1.2. The Oxygen line
    • 4.1.3. The iron edge. Ionized reflection of ionized absorption?
    • 4.1.4. The iron line
    • 4.1.5. PDS data
    • 4.1.6. The soft excess
  • 4.2. Second half of the observation
• 5. Comparison with previous observations
• 6. Discussion
• 7. Summary
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000
helpdesk@link.springer.de