Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...450..925b&link_type=abstract
Astronomy and Astrophysics, Volume 450, Issue 3, May II 2006, pp.925-931
Astronomy and Astrophysics
Astrophysics
7
Scientific paper
Aims.The detection of high velocity absorption lines from highly ionized material has been reported recently from the X-ray spectrum of the narrow line Seyfert 1 galaxy PG 0844+349 and were interpreted as a relativistic outflow from the source. We studied this outflow because it would have important implications for our understanding of narrow line Seyfert 1 galaxies. Methods: .To address the reality of these absorption features, we analyzed a long XMM observation with the MOS cameras on this object. Results: .We did not detect the absorption lines claimed, and a re-analysis of the previous data set with the most recent detector calibrations did not confirm the earlier results. The X-ray spectra can be well modeled with a power law plus a bremsstrahlung component. With this description, the soft and the harder 2-10 keV X-ray flux changed by a similar fraction (≃25%) between the two observations with only small changes in the spectral form. An analysis of the hardness ratio variations within a single observation does not show any strong correlation between the hardness ratio and the continuum luminosity and we do not detect substantial lags between the hard and soft band fluxes.
Brinkmann Wolfgang
Grupe Dirk
Raeth Christoph
Wang Tower
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