Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-05
Astrophys.J. 503 (1998) 174
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ. Two files: one containing the LaTeX text and 6 PS figs (26 pages), and one containing the LaT
Scientific paper
10.1086/305988
We present the results from ASCA observations of NGC 3783 carried out during 1993 and 1996. Variability is observed both between the two epochs and within the individual observations, the latter due to a non-stationary process. We find the spectra at both epochs to contain features due to absorption by ionized material, predominantly due to Ovii and Oviii. We find the opacity for such material to decrease by a factor approx 2 in the approx 0.7--1.0 keV band between the epochs while the photoionizing flux increases by approx25%. By comparison with detailed photoionization models we show this behaviour is inconsistent with that expected from a single-zone of photoionized gas. A deficit in the data compared to such models, consistent with excess absorption by Oviii, supports the suggestion that the material consists of two or more zones. Significant Fe K-shell emission is also observed during both epochs. We show this emission is dominated by the asymmetric line profile expected from the innermost regions of the accretion flow. We find no evidence that the Fe emission varied in either shape or equivalent width between the two epochs.
George Ian Michael
Mushotzky Richard F.
Nandra Kirpal
Netzer Hagai
Turner Tracey Jane
No associations
LandOfFree
ASCA Observations of the Ionized Gas in the Seyfert Galaxy NGC 3783 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 ASCA Observations of the Ionized Gas in the Seyfert Galaxy NGC 3783, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ASCA Observations of the Ionized Gas in the Seyfert Galaxy NGC 3783 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-679550