Complex resonance absorption structure in the X-ray spectrum of IRAS 13349+2438
By Masao Sako, S. M. Kahn, Eda Behar, J. Kaastra, A. Brinkman, T. Boller, E. Puchnarewicz, R. Starling, D. Liedahl, J. Clavel and 1 more. 2000
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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 - 1400 km/s) 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 A 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 two distinct regions, one of which is tentatively associated with the medium that produces the optical/UV reddening.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/e8aaa8f48f98ca528df49a3630081352f1094023
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Citations in the corpus
- The nature and origin of Seyfert warm absorbers (2004, background): “The results of this comparison are that the minimum and maximum warm absorber distances for the Seyferts and NLSy1s are all further out than the BLR, and mostly cluster around the distance of the torus.”
- The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-averaged 900 Kilosecond Chandra Grating Spectroscopy (2002, unknown): “We identify this feature as arising from numerous inner-shell 2p–3d absorption lines of Fe M-shell ions blended into an unresolved transition array (UTA; Sako et al. 2001; Behar, Sako, & Kahn 2001).”
- Ubiquitous Variability of X-Ray-absorbing Column Densities in Seyfert 2 Galaxies (2001, methodology): “An indication for an absorber on the BELR scale is also provided by recent highresolution soft X-ray spectra obtained with XMM-Newton (Sako et al. 2001).”
- A high-velocity ionized outflow and XUV photosphere in the narrow emission line quasar PG1211+143 (2003, background): “…developments in X-ray studies of AGN has been the observation, from high resolution grating spectra obtained with Chandra and XMM-Newton, of complex absorption indicating circumnuclear (often outflowing) matter existing in a wide range of ionisation states (eg Sako et al. 2001, Kaspi et al. 2002).”
- XMM-Newton Reflection Grating Spectrometer Observations of Discrete Soft X-Ray Emission Features from NGC 1068 (2002, background): “…negligible photoelectric absorption and, additionally, are consistent (within a factor of a few) with the column densities derived from several recent high-resolution soft X-ray spectra of Seyfert 1 galaxies (Kaastra et al. 2000; Kaspi et al. 2000; Branduardi-Raymont et al. 2001; Sako et al. 2001).”
- A long hard look at MCG–6-30-15 with XMM-Newton (2002, methodology): “The columns of Fe ions derived using RGS data by Blustin et al. (2002) for NGC 3783, and by Sako et al. (2001) for IRAS 13349+2438 predict strong K edges witha total optical depthτmax ∼ 0.05 (see also Reeves et al. 2003).”
- High-Resolution X-Ray Spectroscopy and Modeling of the Absorbing and Emitting Outflow in NGC 3783 (2001, methodology): “Sako et al. (2001) have recently observed a similar, but much stronger, absorption feature in the X-ray spectrum of the quasar IRAS 13349]2438 and have identiÐed it as an unresolved transition array of 2pÈ3d inner-shell absorption lines by iron M-shell ions (Fe IXÈFe XIV) in a relatively low…”
- Toward a Self-Consistent Model of the Ionized Absorber in NGC 3783 (2003, background): “IRAS 13349+2438 is another example of an ionized absorber with two different absorption components (Sako et al. 2001).”