Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.206..235i&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 206, no. 2, p. 235-248
Astronomy and Astrophysics
Astrophysics
2
Emission Spectra, Galactic Nuclei, H Beta Line, Seyfert Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Orbital Mechanics, Radial Velocity, Red Shift
Scientific paper
The nucleus of the Seyfert 1.5 galaxy NGC 5548 was very faint and the intensity of the broad emission component of H Beta was unusually low in March-April and in July 1990. Similar stages was found only twice in this decade, in 1979 and 1981, prior to the present one. The very broad components of He I and He II were not detected in 1990. The blueward edge of the broad component of H Beta was much steeper than the redward one in 1990, in contrast to the profiles with the opposite asymmetry in the years 1979-1981. This result suggests that a main part of the broad component blueshifted in the recent several years. An upper limit of the displacement of the broad component of H Beta occurred during the years from 1984 to 1990 was estimated to be about - 2000 km/s. If this variation of the radial velocity was due to an orbital motion of the exciting source in a binary system, the total mass of the system is about less than or equal to 6 x 106 Solar Masses. The luminosity of the nucleus is the same order of the Eddington limit of this total mass.
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