Spectral Investigation of NGC 7469 Virtual Observatory Resource

Authors
  1. Doroshenko V.T.
  2. Sergeev S. G.
  3. Chuvaev K. K.
  4. Published by
    CDS
Abstract

This investigation is mainly related to hydrogen lines in the spectrum of NGC 7469 from the 1972-1990 data obtained using an image tube on the 2.6-m telescope of the Crimean Astrophysical Observatory. The decomposition of the hydrogen lines into broad and narrow components was performed. Variations in the intensities and broad-component contours were observed. One third of the spectrograms showed a broad, symmetric Ha line, while the others showed asymmetry: the blue wings fall more steeply than the red ones. The degree of asymmetry is variable, but no correlation between it and the brightness of the nucleus was found. This asymmetry becomes weaker when passing to higher members of the Balmer series. The halfwidths of the broad components increase from Ha to H{gamma}. Redshifts of broad components with respect to narrow ones might also be larger for higher members of the Balmer series. Intensities of the broad hydrogen lines follow continuum variations with a delay of about 28 days. The Balmer decrement for broad lines is much flatter than for narrow ones.

Keywords
  1. galaxies
  2. spectroscopy
  3. narrow-band-photometry
  4. atomic-spectroscopy
Bibliographic source Bibcode
1994AZh....71..200D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AZh/71/200
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AZh/71/200

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History

1997-12-09T20:43:08Z
Resource record created
1997-12-09T19:43:12Z
Updated
1997-12-09T20:43:08Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr