PG 0844+349 revisited – is there any outflow?

Free access article

Issue		A&A Volume 450, Number 3, May II 2006


Page(s)		925 - 931
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20053751

A&A 450, 925-931 (2006)
DOI: 10.1051/0004-6361:20053751

PG 0844+349 revisited - is there any outflow?

W. Brinkmann¹, T. Wang², D. Grupe³ and C. Raeth¹

¹ Max-Planck-Institut für Extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany
    e-mail: wpb@mpe.mpg.de
² University of Science and Technology of China, HeFei, Anhui 230026, PR China
    e-mail: twang@ustc.edu.cn
³ Astronomy Department, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
    e-mail: grupe@astro.psu.edu

(Received 4 July 2005 / Accepted 29 November 2005 )

Abstract
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 ( $\simeq$ 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.

Key words: galaxies: active -- quasars: general -- quasars: individual: PG 0844+349

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