Mathematics – Logic
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..905p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, June 1982, p. 905-913.
Mathematics
Logic
72
Astronomical Photography, Astronomical Spectroscopy, Seyfert Galaxies, Spiral Galaxies, Barred Galaxies, Emission Spectra, Galactic Nuclei, Morphology, Radial Velocity, Virgo Galactic Cluster
Scientific paper
Direct photographic data and preliminary spectroscopy of the spiral galaxy NGC 4388 are presented. The galaxy appears to be a barred spiral of morphological class SB(s)b pec and is almost certainly a member of the Virgo cluster. The nucleus was studied with a photon-counting image intensifier/reticon scanner and was found to emit a high-excitation, narrow emission-line spectrum of relatively low luminosity. Image-tube spectrograms and spectroscopy using an image photon-counting system revealed optical, X-ray, and radio nuclear properties consistent with a classical Seyfert 2 galaxy. The radial velocity of the peaks of the asymmetric nuclear emission lines is 55 km/s less than the H I 21 cm systemic velocity.
Malin David F.
Phillips Marcia
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