Study of multiple nucleus galaxies. I - MKN 788

Details Study of multiple nucleus galaxies. I - MKN 788 Study of multiple nucleus galaxies. I - MKN 788

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...163...31k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 163, no. 1-2, July 1986, p. 31-38.

Astronomy and Astrophysics

Astrophysics

13

Astrophysics, Galactic Nuclei, Abundance, Astronomical Spectroscopy, Charge Coupled Devices, H Ii Regions, Infrared Astronomy Satellite, Interstellar Extinction, Radio Astronomy, Spectral Line Width, Star Formation, Starburst Galaxies, Visible Spectrum

Scientific paper

This is a first paper in a series discussing the properties of double and multiple nucleus galaxies. Such systems comprise a surprisingly large fraction of galaxies with ultraviolet excess and have not been studied in detail before. In this paper, spectra, optical and radio images are shown as well as broad band infrared photometry of the two nuclei of Mkn 788. The linear separation in this case, of about 8 kpc, indicates either a double nucleus or an interaction between two systems. Spectral analysis shows that the two are similar in some properties to giant extragalactic nuclear H II regions (so called 'starburst nuclei') but contain also a large population of late type stars. From the IRAS and radio continuum fluxes, the total number of OB-stars and the rate of uniform star formation are calculated. The emission line luminosity in both is very high and the metal abundance close to solar. The extinction and strength of the O II 3727 A forbidden line make Mkn 788A an extreme object in this class. There is no means of deciding which one of the two is the dynamical center of Mkn 788.

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