Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51..347l&link_type=abstract
Astronomy and Astrophysics, vol. 51, no. 3, Sept. 1976, p. 347-355. In French.
Astronomy and Astrophysics
Astrophysics
12
Astronomical Photometry, Electronography, Quasars, Radio Galaxies, Spiral Galaxies, Galactic Radiation, Isophotes, Luminous Intensity, Morphology, Red Shift, Ubv Spectra
Scientific paper
Direct UBV electronographic plates of 3C 120 are studied to define with improved precision the photometric morphology, dimensions, and absolute magnitudes of this galaxy. Four morphological regions are delineated: (1) a central nucleus with the color indices of a quasar and an absolute magnitude that varies between -20.0 and -22.1, (2) an asymmetric nebulosity with an absolute magnitude of -17.2 surrounding the nucleus, (3) an underlying nebulosity with somewhat elliptical isophotes and a luminosity profile similar to that of an SB0 galaxy, and (4) peripheral condensations NE and SW of the nucleus which resemble spiral arms. Measurements of the dimensions of this galaxy yield a major axis of 52 kpc and a minor axis of 31.2 kpc, which are slightly smaller than those of the N galaxy 3C 303 and BL Lacertae. It is concluded that 3C 120 exhibits photometric properties intermediate between those of normal galaxies and quasars, that the dimensions and combined luminosity of the nebulosities more closely resemble those of normal spiral galaxies than those of giant ellipticals, and that the absolute magnitudes and dimensions of 3C 120 are consistent with the cosmological-redshift hypothesis.
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