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)
· References in the article
· Citations to the Article (111) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (55)
· NED Objects (53)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Spectroscopic study of the CfA sample of Seyfert galaxies
Authors:
Osterbrock, Donald E.; Martel, Andre
Affiliation:
AA(California Univ., Santa Cruz), AB(California Univ., Santa Cruz)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 552-562. (ApJ Homepage)
Publication Date:
09/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Active Galactic Nuclei, Astronomical Spectroscopy, Emission Spectra, Extragalactic Radio Sources, Galactic Structure, Seyfert Galaxies, Classifying, H Alpha Line, H Beta Line, H I Regions, Luminosity, Spectrophotometry
DOI:
10.1086/173102
Bibliographic Code:
1993ApJ...414..552O

Abstract

High SNR spectra were obtained of nearly all the Seyfert 2 galaxies in the CfA complete sample published by Huchra and Burg (1992) and of some of the Seyfert 1's as well. Luminosity functions and mean absolute magnitudes were calculated separately for each type and for various groupings of the types. Our spectra confirm Huchra and Burg's conclusion that the CfA sample contains a higher fraction of Seyfert 1's than the Wasilewski sample, which therefore appears to be deficient in faint reddened Seyfert 1 galaxies. Specific geometrical models and evolutionary pictures of AGNs are discussed. All Seyfert 1.8, 1.9, and 2 galaxy spectra were measured spectrophotometrically, and all, when plotted in diagnostic diagrams, lie in the AGN regions except for two objects barely outside the region on one diagram. These good SNR spectra confirm that, as suspected earlier, many Seyfert 1.8, 1.9, and 2 galaxies have weak forbidden Fe X 6735 A emission in their spectra. The broad components of the Seyfert 1.8 and 1.9 galaxies have large H-alpha/H-beta intensity ratios, extending previous similar results.

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)

  New!

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