Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992eocm.rept..141b&link_type=abstract
In ESA, Environment Observation and Climate Modelling Through International Space Projects. Space Sciences with Particular Empha
Astronomy and Astrophysics
Astronomy
Emission Spectra, Seyfert Galaxies, Spaceborne Astronomy, Variability, X Ray Astronomy, X Ray Spectra, Astronomical Satellites, Japanese Spacecraft, Mathematical Models, Spectrum Analysis
Scientific paper
Observations of the Seyfert 2 galaxy NGC5506 by Ginga from 6-10 Jul. 1991 are discussed. The spectrum obtained on 9 Jul. was found to be consideraby softer below 3 keV compared with the other observation days. The spectra are each best described by a composite partial covering model and reflection model. While the presence of ionized matter is not ruled out, the lack of correlation of the spectral softness with the continuum flux rules out models based on photoionization as the softness variability mechanism. In reality the soft excess seen in NGC 5506 is probably complex and comprises several components.
Bond Ian A.
Matsuoka Masaru
Yamauchi Makoto
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