EDP Sciences
Free access
Volume 408, Number 3, September IV 2003
Page(s) 921 - 928
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20031021

A&A 408, 921-928 (2003)
DOI: 10.1051/0004-6361:20031021

Chandra LETGS and XMM-Newton observations of NGC 4593

K. C. Steenbrugge1, J. S. Kaastra1, A. J. Blustin2, G. Branduardi-Raymont2, M. Sako3, E. Behar4, S. M. Kahn5, F. B. S. Paerels5 and R. Walter6

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

(Received 21 January 2003 / Accepted 24 June 2003)

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 $400\times 10 ^{-9}$ W m, visible as a depression at 10-18 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 $\xi = 3 \times 10 ^{-9}$ 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 K $\alpha$ line.

Key words: galaxies: active -- galaxies: Seyfert -- galaxies: individual: NGC 4593 -- X-rays: galaxies -- techniques: spectroscopic

Offprint request: K. C. Steenbrugge, K.C.Steenbrugge@sron.nl

SIMBAD Objects

© ESO 2003

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.