An ultraviolet and optical study of the broad-line radio galaxy 3C 382

Details An ultraviolet and optical study of the broad-line radio galaxy 3C 382 An ultraviolet and optical study of the broad-line radio galaxy 3C 382

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..555t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 1, 1986, p. 555-574.

Astronomy and Astrophysics

Astronomy

30

Astronomical Spectroscopy, Radio Galaxies, Ultraviolet Spectra, Visible Spectrum, Balmer Series, Carbon, Emission Spectra, Galactic Nuclei, Lyman Alpha Radiation, Magnesium, Periodic Variations, Spectral Energy Distribution, Spectral Line Width

Scientific paper

Ultraviolet spectra covering 13 separate epochs are presented for the extreme broad-line radio galaxy 3C 382. These show marked variability in both lines and continuum on a time-scale less than about 1 yr. The C IV 1550 A and L-alpha 1216 A lines follow the changes in the ultraviolet continuum but appear to have different profiles, the L-alpha 1216 having a relatively stronger core. By comparison with the present and published optical data, it is apparent that L-alpha and C IV have variability properties different from those of the Balmer lines and Mg II 2800 A. L-alpha 1216 A becomes weaker relative to the Balmer lines as the ultraviolet continuum diminishes (an observation that places important constraints on ionization models for the broad line radio galaxies). A long-slit spectrum obtained with the newly commissioned INT telescope shows extended emission lines at up to 17 arcsec (25 kpc, H = 50 km/s per Mpc) from the nucleus and demonstrates a large velocity gradient in the narrow-line gas across the nucleus.

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