Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978azh....55..937d&link_type=abstract
(Astronomicheskii Zhurnal, vol. 55, Sept.-Oct. 1978, p. 937-943.) Soviet Astronomy, vol. 22, Sept.-Oct. 1978, p. 536-539. Trans
Astronomy and Astrophysics
Astronomy
6
Astronomical Photometry, Astronomical Spectroscopy, Seyfert Galaxies, Spectrophotometry, Ubv Spectra, Electrophotometry, Energy Distribution, Galactic Radiation, Hydrogen Clouds, Image Tubes, Luminous Intensity, Quasars
Scientific paper
Results are presented for image-converter spectroscopy, UBV photoelectric photometry, and photoelectric scans with 100-A resolution of the nucleus of the galaxy Ark 120. The redshift of the galaxy, corrected for solar motion, is determined to be z = 0.0326. It is found that the continuum energy distribution in the range from 4000 to 7000 A closely fits a power law of index 1.9 (for a 25-arcsec diaphragm) or 1.0 (for a 10-arcsec diaphragm), that the UV luminosity of the galaxy originates primarily from the nucleus, and that the forbidden lines are of very low intensity. The general nature of the line profiles is shown to be typical of most Seyfert galaxies, and hydrogen masses are estimated for both the broad-line and forbidden-line regions. It is concluded that Ark 120 occupies an intermediate position between Seyfert galaxies and quasars.
Dibai E. A.
Doroshenko V. T.
Terebizh Iu. V.
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