The ionization mechanism for gas in the nuclei of NGC 1052 and NGC 4278

Details The ionization mechanism for gas in the nuclei of NGC 1052 and NGC 4278 The ionization mechanism for gas in the nuclei of NGC 1052 and NGC 4278

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285...55r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 55-63.

Astronomy and Astrophysics

Astronomy

28

Astronomical Spectroscopy, Galactic Nuclei, Galactic Radiation, Gas Ionization, Active Galactic Nuclei, Active Galaxies, Emission Spectra, Oxygen Spectra, Photoionization, Ultraviolet Astronomy, Wavelengths

Scientific paper

Photographic image-tube spectra at a resolution of 2.5 A in the blue have been obtained for the nuclei of the active elliptical galaxies NGC 1052 and NGC 4278 and for several emission-free galaxy nuclei using the University of Hawaii 2.24 m telescope at the Mauna Kea Observatory. The purpose of this study was to determine the ionization mechanism for low-ionization active galactic nuclei. A search for the diagnostic forbidden emission line O III 4363 in NGC 1052 yields a lower limit of 47 to the ratio forbidden O III (5007 + 4959)/4363, which implies a temperature for the forbidden O III-emitting gas less than 17,600 K. This temperature is incompatible with shock ionization, and it is concluded that the nuclear gas in NGC 1052, the prototype low-ionization active nucleus, is photoionized by a nonstellar UV continuum. A similar analysis for NGC 4278 yields a lower limit of 21 to the ratio forbidden O III (5007 + 4959)/4363 and an electron temperature less than 30,300 K.

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