NGC 4151: An Intrinsically Average Seyfert 1
Abstract
We present a detailed analysis of a long, 100 ks observation of NGC 4151 by ASCA, contemporaneous with an observation by CGRO/OSSE. We fit the data with physical models including an Fe K line and Compton reflection both relativistically broadened and coupled according to theoretical results. The model also includes a narrow Fe K component, which is emitted by both an extended plasma region and the X-ray absorber. Our study of the absorber shows strong evidence for the presence of more than one partial-covering cloud in the line of sight. Taking these points into account, our best intrinsic model includes a Comptonization continuum with an X-ray slope of Γ~=1.9 from a thermal plasma with an electron kT~70 keV and a disk line with an equivalent width of ~70 eV. The broadening of the line and reflection indicate their origin from innermost parts of an accretion disk. Our results indicate that NGC 4151 has an intrinsic X-ray spectrum and variability properties similar to those of average Seyfert 1 galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 2002
- DOI:
- 10.1086/340745
- arXiv:
- arXiv:astro-ph/0108036
- Bibcode:
- 2002ApJ...573..505Z
- Keywords:
-
- Accretion;
- Accretion Disks;
- Galaxies: Active;
- Galaxies: Individual: NGC Number: NGC 4151;
- Galaxies: Seyfert;
- Line: Profiles;
- X-Rays: Galaxies;
- Astrophysics
- E-Print:
- ApJ, in press, 14 pages, some figures in color