Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..431..199l&link_type=abstract
Accretion processes in astrophysical systems: Some like it hot! - eigth astrophysics conference. AIP Conference Proceedings, Vo
Astronomy and Astrophysics
Astrophysics
3
Active And Peculiar Galaxies And Related Systems, X-Ray
Scientific paper
I report the results of a comprehensive analysis of a sample 23 ASCA observations of 21 narrow-line Seyfert 1 galaxies (NLS1s). In comparison with Seyfert 1 galaxies with broader optical lines, NLS1s are more variable as parameterized by the excess variance during a typical 1 day observation. There is a strong correlation between excess variance and luminosity, and also a tendency for objects with steeper overall ASCA spectra to show higher excess variance. Eleven objects had very steep hard X-ray photon indices. A soft excess component was required in 15 spectra, and significant absorption was found in 6 objects. Three NLS1s showed features near 1 keV which have been interpreted as signatures of absorption in relativistically outflowing gas. Three others have an emission feature near 1 keV which was interpreted as emission from photoionized neon or iron in PG 1244+026.
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