Issue |
A&A
Volume 365, Number 1, January 2001
First Results from XMM-Newton
|
|
---|---|---|
Page(s) | L168 - L173 | |
DOI | https://doi.org/10.1051/0004-6361:20000081 | |
Published online | 15 January 2001 |
Complex resonance absorption structure in the X-ray spectrum of IRAS 13349+2438 *
1
Department of Physics and Columbia Astrophysics Laboratory, 550 West 120th Street, New York, NY 10027, USA
2
Space Research Organization of the Netherlands, Sorbonnelaan 2, 3548 CA, Utrecht, The Netherlands
3
Max-Planck-Institut fuer Extraterrestrische Physik, Postfach 1603, 85741 Garching, Germany
4
Mullard Space Science Laboratory, University College, London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK
5
Physics Department, Lawrence Livermore National Laboratory, PO Box 808, L-41, Livermore, CA 94550, USA
6
XMM Science Operations, Astrophysics Division, ESA Space Science Dept., PO Box 50727, 28080 Madrid, Spain
Corresponding author: M. Sako, masao@astro.columbia.edu
Received:
2
October
2000
Accepted:
30
October
2000
The luminous infrared-loud quasar IRAS 13349+2438 was
observed with the XMM-Newton Observatory as part of the Performance
Verification program. The spectrum obtained by the Reflection Grating
Spectrometer (RGS) exhibits broad ( FWHM)
absorption lines from highly ionized elements including hydrogen- and
helium-like carbon, nitrogen, oxygen, and neon, and several iron L-shell
ions (Fexvii-xx). Also shown in the spectrum is the first
astrophysical detection of a broad absorption feature around
Åidentified as an unresolved transition array (UTA) of 2p-3d
inner-shell absorption by iron M-shell ions in a much cooler medium; a
feature that might be misidentified as an Ovii edge when observed
with moderate resolution spectrometers. No absorption edges are clearly
detected in the spectrum. We demonstrate that the RGS spectrum of
IRAS 13349+2438 exhibits absorption lines from at least two
distinct regions, one of which is tentatively associated with the medium
that produces the optical/UV reddening.
Key words: atomic processes / line: formation / techniques: spectroscopic / quasars: absorption lines / quasars: individual: IRAS 13349+2438 / X-rays: galaxies
© ESO, 2001
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