Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..108o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 108-117.
Astronomy and Astrophysics
Astrophysics
36
Emission Spectra, Seyfert Galaxies, Spectral Line Width, Visible Spectrum, Charge Coupled Devices, Galactic Nuclei, Red Shift
Scientific paper
Spectra were obtained of 35 of the 36 narrow emission line galaxies isolated in the Palomar-Green (PG) survey of Green, Schmidt, and Liebert (1986). Of these, three are narrow-line Seyfert 1 galaxies, three more are Seyfert 1.5 galaxies, and only one, PG 2259 + 157 = NGC 7465 = Mrk 313, is a relatively low-ionization active galactic nucleus, a marginal Seyfert 2 with forbidden O III line 5007/H-beta of about 3. The rest are H II region galaxies, as is CSO 177, a candidate Seyfert 2 galaxy not previously observed at H-alpha. Redshifts and relative emission-line strengths are given for all these galaxies. These spectra confirm that a survey such as the PG, based on ultraviolet excesses, though good for finding QSOs, is not well suited for finding Seyfert 2 galaxies. However, the PG survey shows that a significant number of Seyfert 1 galaxies are 'narrow-line' objects with H I emission-line full widths at half-maximum equal to or less than 2000 km/s.
Osterbrock Donald E.
Pogge Richard W.
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