A&A 397, 883-890 (2003)
XMM-Newton observations of the Seyfert 1 galaxy NGC 3227P. Gondoin, A. Orr, D. Lumb and H. Siddiqui
Research and Scientific Support Department, European Space Agency - Postbus 299, 2200 AG Noordwijk, The Netherlands
(Received 1 May 2002 / Accepted 30 October 2002 )
We report on an XMM-Newton observation of the Seyfert 1 galaxy NGC 3227 performed in November 2000. The observed X-ray spectrum above 4 keV is well fitted by a hard power law continuum ( ) and an absorption edge at 7.6 keV. An Fe K emission line with an equivalent width of 213 eV is detected at 6.4 keV. The line is narrow suggesting contribution from material in low ionization states ( <Fe XVII) relatively far from a central black hole. The continuum is strongly absorbed at soft energies by a column of neutral gas ( cm -2) larger than previously measured and covering a significant fraction ( 90%) of the central source. The soft X-ray continuum is also attenuated due to the presence of ionized material ( erg s -1 cm) suggesting the presence of a substantial amount of gas ( cm -2) in the vicinity ( <0.4 pc) of the nucleus. We find that NGC 3227 exhibits significant spectral variability above 2 keV on time scales of a few ksec during the XMM-Newton observations. This short term variability is likely related to variation in the continuum emission. Comparisons with previous observations indicate that variability on timescale of a month also involves a change in the column densities of neutral absorbing material along the line of sight to the nucleus.
Key words: galaxies: individual: NGC 3227 -- galaxies: nuclei -- galaxies: Seyfert
Offprint request: P. Gondoin, firstname.lastname@example.org
© ESO 2003