Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..743r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 743-756, 1027.
Astronomy and Astrophysics
Astronomy
19
Emission Spectra, Globular Clusters, H Alpha Line, Seyfert Galaxies, Star Formation, Charge Coupled Devices, H Ii Regions, Novae, Red Shift, Stellar Luminosity
Scientific paper
A detailed analysis of the physical conditions and of the kinematical and dynamical properties of the system of interacting galaxies NGC 7592, the western component of which shows signs of Seyfert activity, is presented. The aspect and kinematics of the galaxies suggest that a prograde encounter between the eastern and the western component of the system is occurring. The large H-alpha luminosity indicates that all galaxies are undergoing a strong burst of star formation, with a very large global star formation rate (about 20 solar masses/yr). In the spectra of the nuclear and circumnuclear regions of the western component, the high ionization lines are redshifted by about 50 km/s with respect to the low ionization lines, and their ratios indicate the simultaneous presence of thermally and nonthermally ionized gas. This is interpreted in terms of the coexistence in the nucleus of the western component of Seyfert and Starburst activity, the latter being responsible for about 75 percent of the H-alpha line luminosity.
Marziani Paolo
Rafanelli Piero
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