Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987msngr..49...10c&link_type=abstract
ESO Messenger (ISSN 0722-6691), Sept. 1987, v. 49, p. 10, 11.
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Emission Spectra, Galactic Structure, Seyfert Galaxies, Gamma Ray Astronomy, Interstellar Matter
Scientific paper
Observations of the NGC 4388 galaxy (which is classified as Seifert 2 galaxy), performed at the Cassegrain focus of the La Silla 2.2-m telescope, are discussed. Long-slit spectroscopy was obtained at position angles 23 and 152 deg, with the O III line emission observed over a total extension of 24 arcsec symmetric to the nucleus. Contrary to the general behavior observed in the O III line profile of Seyfert galaxies, the NGC 4388 galaxy shows a peculiar red asymmetry. The overall O III line 5007-A profile is composed, both at position angles of 23 and 152 deg, of five clearly distinguishable components, separated by up to 600 km/s: the main component C2, which extends over the central region from 3 arcsec NE to 6 arcsec SE; two other major components, C3 and C4, extending over a region of +/- 6 arcsec symmetrically with respect to the nucleus; and two smaller components, C1 and C5, concentrated at the center. It is suggested that these components could be associated with a system of giant clouds confined to the inner six arcsecs from the nucleus.
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