Hostname: page-component-848d4c4894-hfldf Total loading time: 0 Render date: 2024-05-18T01:09:01.101Z Has data issue: false hasContentIssue false
  • English
  • Français

ASCA Observations of Narrow Line Seyfert 1 Galaxies

Published online by Cambridge University Press:  25 May 2016

K. Hayashida
K. Hayashida*
Affiliation:
Department of Earth & Space Science, Osaka University 1-1, Machikaneyama, Toyonaka, Osaka, Japan hayasida@ess.sci.osaka-u.ac.jp

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Study of nine Narrow Line Seyfert 1 galaxies (NLS1) observed with ASCA is presented. The X-ray spectra are fitted with a two component model. The soft component can be represented by a blackbody model with kT~100eV. To make the observed luminosity below the Eddignton limit, we have to assume the emission region has a size much smaller than 3Rs. The X-ray variabilities of the NLS1s have systematically shorter time scale than the typical (broad line) Seyferts 1 (BLS1), which suggests lower black hole masses in the NLS1s.

We also study the the X-ray spectral structure around 1.1 keV, which has been reported for some NLS1s. Although the structure has been interpreted as an absorption feature, we propose an alternative model employing emission lines. One possible origin of the emission lines is preprocessing from a highly ionized accretion disk.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 428 - 429
Copyright
Copyright © Kluwer 1998 

References

Hayashida, K. et al. (1997a), ApJ , accepted.Google Scholar
Otani, C., Kii, T. & Miya, K. (1996) MPE report , p.263.Google Scholar
Comastori, A., Molendi, S. & Ulrich, M.H. (1997) X-ray Imaging and Spectroscopy of Cosmic Hot Plasmas , p.279.Google Scholar
Hayashida, K. (1997b), Emission Line in Active Galaxies (IAU colloquium 159) , p.40.Google Scholar
Leghily, K.M. et al. (1997) ApJ , in press.Google Scholar
Ross, R.R. & Fabian, A.C. (1993), MNRAS , 261, p.74.Google Scholar