Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18510801p&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #108.01; Bulletin of the American Astronomical Society, Vol. 26, p.1499
Astronomy and Astrophysics
Astronomy
Scientific paper
We will present the results of BATSE (15-200 keV) occultation measurements of the nearby Seyfert galaxy NGC 4151. This AGN is variable on time scales of a few days, but long-term daily monitoring has never been possible in X-rays or gamma-rays prior to BATSE. Earlier balloon experiments measured large variations in both intensity and spectral shape, while OSSE observations have reported only a 15% flux variation with no variation in spectral shape in the last few years. Long term monitoring is thus quite important. The standard occultation analysis allows detection of NGC4151 on few-day time scales and spectral measurements on week time scales. NGC4151 is well suited for this study because it is fairly isolated in the X-ray sky and is often observed by OSSE. We will present a time history of both the flux and the spectrum of the source over a fraction of the CGRO mission. The ultimate goal of this work is to compile a 3+ year time history of flux and spectral variations. Future work will be focused on the study of the occultation method to determine the systematic errors that may be present.
Fishman Gerald
Gehrels Neil
Harmon Alan
Paciesas William
Parsons Aaron
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