ARP 102B - A new and unusual broad-line galaxy

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Radio Galaxies, Seyfert Galaxies, Spectral Line Width, Astronomical Models, Balmer Series, Emission Spectra, Photoionization, Shock Waves, Visible Spectrum

Scientific paper

It was suggested in a recent paper by Biermann et al. (1981) that Arp 102B might be a BL Lac object. In fact, the galaxy has a strong emission-line spectrum superposed on a relatively normal stellar continuum. Because the emission-line spectrum includes both very broad Balmer emission lines and a narrow-line component, the galaxy is classified as a broad-line radio galaxy or an intermediate type Seyfert. Arp 102B is atypical for that class, however, because the low ionization emission lines in the narrow-line component are much stronger relative to forbidden O III wavelength 5007 than usual. Either shock excitation or low ionization-parameter power law photoionization models can explain the observed narrow-line spectrum. Indirect arguments appear to favor the shock model.

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