Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· On-line Data
· References in the article
· Citations to the Article (88) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (12)
· NED Objects (10)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Hard X-ray tests of the unified model for an ultraviolet-detected sample of Seyfert 2 galaxies
Authors:
Mulchaey, John S.; Mushotzky, Richard F.; Weaver, Kimberly A.
Affiliation:
AA(Maryland, University, College Park; Space Telescope Science Institute, Baltimore), AB(NASA, Goddard Space Flight Center, Greenbelt, MD), AC(NASA, Goddard Space Flight Center, Greenbelt; Maryland, University, College Park)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. L69-L72. (ApJL Homepage)
Publication Date:
05/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Galactic Nuclei, Seyfert Galaxies, Ultraviolet Astronomy, X Ray Astronomy, Astronomical Models, Ultraviolet Radiation, X Ray Absorption
DOI:
10.1086/186374
Bibliographic Code:
1992ApJ...390L..69M

Abstract

An ultraviolet-detected sample of Seyfert 2 galaxies shows heavy photoelectric absorption in the hard X-ray band. The presence of UV emission combined with hard X-ray absorption argues strongly for a special geometry which must have the general properties of the Antonucci and Miller unified model. The observations of this sample are consistent with the picture in which the hard X-ray photons are viewed directly through the obscuring matter (molecular torus?) and the optical, UV, and soft X-ray continuum are seen in scattered light. The large range in X-ray column densities implies that there must be a large variation in intrinsic thicknesses of molecular tori, an assumption not found in the simplest of unified models. Furthermore, constraints based on the cosmic X-ray background suggest that some of the underlying assumptions of the unified model are wrong.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints