Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-31
Astron.Astrophys. 365 (2001) L168
Astronomy and Astrophysics
Astrophysics
6 pages. Accepted for publication in Astronomy and Astrophysics Letters, XMM issue
Scientific paper
10.1051/0004-6361:20000081
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 (v ~ 1400 km/s FWHM) absorption lines from highly ionized elements including hydrogen- and helium-like carbon, nitrogen, oxygen, and neon, and several iron L-shell ions (Fe XVII - XX). Also shown in the spectrum is the first astrophysical detection of a broad absorption feature around lambda = 16 - 17 Ang identified 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 O VII 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.
Behar Ehud
Boller Th.
Brinkman Albert C.
Clavel Jean
Kaastra Jelle S.
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