Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..356k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Aug. 1990, p. 356-372.
Astronomy and Astrophysics
Astronomy
34
Active Galactic Nuclei, H Alpha Line, Seyfert Galaxies, Shock Waves, Star Formation, Wave Excitation, Emission Spectra, Energy Sources, Far Infrared Radiation, H Ii Regions, Infrared Astronomy Satellite, Line Spectra
Scientific paper
Observations of the IR-excess object NGC 6240 are presented, including (1) broadband BVR, Gunn z, i, H-alpha, forbidden N II (658.3-nm), and K images obtained at ESO and KPNO; (2) 350-690-nm and 550-1100-nm long-slit spectra obtained at La Palma and ESO; and (3) 628.0-697.5-nm fiber-array spectra of the inner region obtained with the 4-m Mayall telescope at KPNO. The results are presented graphically and characterized in detail. Strong optical line emission is attributed to shocks between clouds in large-scale chaotic motion, and evidence found for an active Seyfert-1-type nucleus. There is only a moderate amount of star formation, and two central light concentrations are interpreted as the remnant nuclei of merging galaxies. It is suggested that the observed luminosity of NGC 6240 could be maintained for tens of Myr (without dominant starburst activity) by the energy stored in gas motion, assuming that the proportion of ionized gas is less than 0.0001.
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