Observations of 3C 390.3 with the International Ultraviolet Explorer

Details Observations of 3C 390.3 with the International Ultraviolet Explorer Observations of 3C 390.3 with the International Ultraviolet Explorer

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187p..65f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, June 1979, p. 65P-71P.

Astronomy and Astrophysics

Astronomy

18

Astronomical Spectroscopy, Line Spectra, Radio Galaxies, Satellite Observation, Balmer Series, Electron Density (Concentration), Emission Spectra, Iue, Lyman Alpha Radiation

Scientific paper

Observations of the radio galaxy 3C 390.3 made with IUE are presented; these allow separate determinations of the Lyman/Balmer ratios in both the narrow and broad emission-line regions. The broad-line L-alpha/H-alpha ratio confirms the anomalous results found previously in quasars; in this case a ratio is found about 15 times smaller than that predicted by simple recombination models. By contrast, the L-alpha/H-alpha ratio found for the lower-density narrow-line region is nearly normal. It is argued that the broad-line spectrum can be interpreted in terms of collisional processes at high densities (electron densities of 10 billion to 25 billion per cu cm).

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