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

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

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..465s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 465-470.

Astronomy and Astrophysics

Astrophysics

33

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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