PG 0844+349 revisited – is there any outflow?

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 ( 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.

High Velocity Outflows in AGNs Observed with Gratings

“…In a later study of the spectrum of PG 0844+349. Brinkmann et al (2006) did not detect the claimed absorption lines and a re-analysis of the same data set with the most recent detector calibrations did not confirm the earlier results.…”

The Variable High-Velocity Outflows Seen in X-Ray Spectra

“…In a repeat study of the spectrum of PG 0844+349, Brinkmann et al (2006) did not detect the claimed absorption lines, and a re-analysis of the same data set with the most recent detector calibrations did not confirm the earlier results.…”

Radio and X-ray emission from disc winds in radio-quiet quasars

“…As is the case for PG 0050+124, Piconcelli et al (2004) gives the unabsorbed X-ray luminosity for PG 2214+139. Finally, for PG 0844+349 EPIC spectra were studied in detail by Brinkmann et al (2006) and Gallo et al (2010). Brinkmann et al (2006) concludes that there is possibly a detection of the Fe XXVI Lyα absorption line, but that the mass-loss rate is certainly less than 1 M ⊙ yr −1 .…”

“…We therefore chose to use the RQQs in the sample of PG quasars which were studied in detail by Brocksopp et al (2006), and added PG 0050+124 which has a high signal‐to‐noise ratio XMM–Newton reflection grating spectrometer (RGS) spectrum (Costantini et al 2007b), PG 0844+349 and PG 2214+139. PG 0844+349 was studied in detail by Brinkmann et al (2006) and Gallo et al (2010), and PG 2214+139 by Piconcelli et al (2004). This gives us a sample of 22 RQQs.…”

“…Finally, for PG 0844+349 EPIC spectra were studied in detail by Brinkmann et al (2006) and Gallo et al (2010). Brinkmann et al (2006) conclude that there is possibly a detection of the Fe xxvi Lyα absorption line, but that the mass‐loss rate is certainly less than 1 M ⊙ yr −1 . Gallo et al (2010) fit the different flux state spectra assuming that the same continuum model holds, and prefer a model with a power law and blurred reflection component, where the normalization and photon index of the power‐law component are variable.…”