Mathematics – Probability
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...81l&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 3, p. 81-84
Mathematics
Probability
3
Active Galactic Nuclei, Brightness Distribution, Extreme Ultraviolet Radiation, Sampling, Spectrum Analysis, X Ray Sources, Cameras, Emission Spectra, Extreme Ultraviolet Explorer Satellite, Probability Density Functions, Rosat Mission, Ultraviolet Astronomy, Wide Angle Lenses
Scientific paper
Active Galactic Nuclei (AGN) emit a substantial fraction of their total radiated power in the EUV passband, because spectroscopically this band is situated at or near the peak of the 'big blue bump,' which is bounded on either side by the UV and soft X-ray excesses. Owing to the lack of observational data, the shape of AGN spectra in the EUV is not well known. This paper presents broad band (65-190 eV) count rates of 11 AGN detected by the Extreme Ultraviolet Explorer (EUVE). Assuming a power law spectral shape for the EUV and soft X-ray energies, we demonstrate that the photon indices of the sources are considerably steeper than typical AGN indices. For 6 sources where ROSAT data are available to provide a more precise determination of their spectral parameters in the 0.1-2.5 keV range, we have used these parameters to compute predicted EUVE count rates and compared them with the observed values. The two sets of quantities agree to within experimental error. We conclude that there is no evidence of spectral steepening or turn-over of the soft X-ray excess at EUV wavelengths for a sample of AGN which covers a wide range of brightness.
Bowyer Stuart
Hwang Chorng-Yuan
Lewis Jacob
Lieu Richard
Mittaz Jon
No associations
LandOfFree
EUV emission from a sample of Active Galactic Nuclei 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 EUV emission from a sample of Active Galactic Nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and EUV emission from a sample of Active Galactic Nuclei will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1266608