Chandra LETGS and XMM-Newton observations of NGC 4593

¹ SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
² Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking Surrey RH5 6NT, UK
³ Theoretical Astrophysics and Space Radiation Laboratory, California Institute of Technology, MC 130-133, Pasadena, CA 91125, USA
⁴ Physics Department, Technion 32000, Israel
⁵ Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA
⁶ University of Geneva, Geneva, Switzerland

Corresponding author: K. C. Steenbrugge, K.C.Steenbrugge@sron.nl

Received: 21 January 2003
Accepted: 24 June 2003

Abstract

In this paper, we analyze spectra of the Seyfert 1 galaxy NGC 4593 obtained with the Chandra Low Energy Transmission Grating Spectrometer (LETGS), the Reflection Grating Spectrometer (RGS) and the European Photon Imaging Camera's (EPIC) onboard of XMM-Newton. The two observations were separated by ~7 months. In the LETGS spectrum we detect a highly ionized warm absorber corresponding to an ionization state of  W m, visible as a depression at  Å. This depression is formed by multiple weak Fe and Ne lines. A much smaller column density was found for the lowly ionized warm absorber, corresponding to  W m. However, an intermediate ionization warm absorber is not detected. For the RGS data the ionization state is hard to constrain. The EPIC results show a narrow Fe Kα line.