Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..806g&link_type=abstract
Astronomy and Astrophysics, v.378, p.806-816 (2001)
Astronomy and Astrophysics
Astrophysics
28
Galaxies: Individual: Ic 4329A, Galaxies: Nuclei, Galaxies: Seyfert
Scientific paper
We report on a simultaneous XMM-Newton and BeppoSAX observation of the Seyfert 1 galaxy IC 4329A performed in 2001 January. Above 1 keV, EPIC spectra show a narrow Fe K emission line at 6.42+0.04-0.03 keV with an equivalent width of 43+/-1 eV. An absorption edge is detected at 7.1+/-0.4 keV in the source rest frame that has not been reported before. The energy of these features is consistent with reflection of the primary X-ray continuum by a optically thick material containing iron in low states of ionization. The narrow Fe K feature suggests that the reflection arises relatively far from a putative central black hole. Spectral fitting of simultaneous XMM-Newton and BeppoSAX data over the 0.3-130 keV energy range shows that the primary continuum is well described by a cut-off power law with a photon index of 1.93+/-0.03 and a folding energy of 260+/-130 keV. The high energy tail >10 keV constrains the reflection fraction close to unity. Fitting over the overall spectral range indicates that the Fe abundance within the cool reflecting material is not significantly different from the cosmic value. The extrapolation of the primary power law continuum to energies <1 keV indicates the presence of absorption edges produced by neutral and ionized oxygen. The optical depth of the O I edge at 0.54 keV constrains the intrinsic absorption by neutral material to an hydrogen column density of =(33 +/- 3)*E20 cm-2 along the line of sight to IC 4329A nucleus. The energy of the edge at 0.854+/-0.009 keV is consistent with absorption by O VIII. A third edge at 0.660+/-0.008 keV is likely related to absorption by O VI and N VII. The simultaneous presence of O VI and O VIII edges without significant O VII absorption indicates that the warm absorber originates from at least two zones.
Barr Paul
Gondoin Ph.
Lumb David
Oosterbroek Tim
Orr Andrew
No associations
LandOfFree
Simultaneous XMM-Newton and BeppoSAX observation of the Seyfert I galaxy IC 4329A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simultaneous XMM-Newton and BeppoSAX observation of the Seyfert I galaxy IC 4329A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simultaneous XMM-Newton and BeppoSAX observation of the Seyfert I galaxy IC 4329A will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1232656