Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1435k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, May 1990, p. 1435-1441.
Astronomy and Astrophysics
Astronomy
29
Active Galactic Nuclei, Infrared Astronomy, Seyfert Galaxies, X Ray Spectra, Astronomical Photometry, Infrared Astronomy Satellite, Infrared Radiation, Spiral Galaxies
Scientific paper
Morphological classification and axial ratio measurements for a sample of 288 Seyfert Galaxies (SGs) are presented. Seyferts are predominantly spirals, and a deficiency of edge-on objects is found of both classes Seyfert 1 and 2 in comparison with a sample of 1600 normal spirals. The data suggest that obscuration extends beyond line region, and that the distribution of dust is flattened and coplanar with the disk of the parent galaxy. A way to find the missing edge-on SGs on the basis of their infrared and X-ray emission is proposed. A sample of 144 IRAS galaxies lying inside or close to unidentified hard X-ray HEAO-1 sources is selected. Most of the target galaxies are in fact seen edge-on, and it is estimated that at least about 34 of them are obscured active galactic nuclei (AGN) associated with the X-ray sources.
Kirhakos Sofia D.
Steiner Joao Evangelista
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