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The Optical Spectrum of PKS 1345+12

1977; IOP Publishing; Volume: 215; Linguagem: Inglês

10.1086/155374

1538-4357

S. A. Grandi,

Astronomical Observations and Instrumentation

view Abstract Citations (36) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Optical Spectrum of PKS 1345+12 Grandi, Steven A. Abstract The optical spectrum of the 17th-magnitude radio galaxy PKS 1345+12 is found to be quite similar to the spectra of narrow-line radio galaxies with respect to emission-line strength, absorption- line strength, and continuum strength and shape. However, the spectrum of PKS 1345+12 is unusual among the narrow-line radio galaxies in having two redshift systems-one containing the high-ionization lines of [0 iii] and [Ne iii], and the other containing (at a Az = +0.0008 with respect to the first system) the Balmer lines and the low-ionization lines of [0 1], [0 ii], [N ii], and [S ii]. Also, the profiles of the lines in PKS 1345+12 fall into two groups, both of which have full widths at half-maximum (FWHM) much larger than the typical narrow-line radio galaxy, and definite blueward wings. The Balmer lines and the high-ionization lines have FWHM of 1600 km s - 1, and the low-ionization lines have FWHM of 1200 km s -`. The observed differences between PKS 1345+12 and other narrow-line radio galaxies may possibly be understood if the large velocity dispersion and general expansion evident in PKS 1345+12 magnify the differences between emission lines emitted in different zones of a three-zone model suggested by observations of NGC 1068. Subject headings: galaxies: individual - galaxies: redshifts - galaxies: Seyfert - radio sources: general Publication: The Astrophysical Journal Pub Date: July 1977 DOI: 10.1086/155374 Bibcode: 1977ApJ...215..446G full text sources ADS | data products SIMBAD (3) NED (1)