Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..996b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 265, p. 996
Astronomy and Astrophysics
Astronomy
19
Seyfert Galaxies, X Ray Spectra, Emission Spectra, Stellar Models, Light Curve, Sky Surveys (Astronomy), Spectrum Analysis, X Ray Astronomy
Scientific paper
We present spatial, temporal, and spectral analyses of ROSAT Position Sensitive Proportional Counter (PSPC) observations of the Seyfert 1 galaxies NGC 7469 and Ark 120. Both of these sources show evidence for excess emission and more complex 0.1-2.5 keV spectra than are predicted by simple extrapolations of higher energy power laws. We find that the spectrum of NGC 7469 can be explained by models that have secondary power-law, secondary bremsstrahlung, secondary blackbody or emission-line components. We find evidence for 0.1-2.5 keV intensity variability of NGC 7469. The spectrum of Ark 120 is better described by models with secondary continuum components than by models with sharper spectral features. We discuss the agreement between X-ray and UV observations of these sources and examine the observations in the context of accretion disk reflection models. The inner parts of disks are likely to be reflective below about 0.24 keV, and this reflectivity complicates simple models of the soft excess.
Brandt Wiliam N.
Fabian Andrea C.
Nandra Kirpal
Tsuruta Sachiko
No associations
LandOfFree
ROSAT PSPC observations of NGC 7469 and Ark 120 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 ROSAT PSPC observations of NGC 7469 and Ark 120, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ROSAT PSPC observations of NGC 7469 and Ark 120 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1300573