Classification parameters for the emission-line spectra of extragalactic objects

Details Classification parameters for the emission-line spectra of extragalactic objects Classification parameters for the emission-line spectra of extragalactic objects

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93....5b&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Feb.-Mar. 1981, p. 5-19. Research supported by Cambridge University

Astronomy and Astrophysics

Astronomy

1406

Astronomical Spectroscopy, Emission Spectra, Line Spectra, Quasars, Seyfert Galaxies, Classifications, H Ii Regions, Photoionization, Planetary Nebulae, Shock Heating

Scientific paper

An investigation is made of the merits of various emission-line intensity ratios for classifying the spectra of extragalactic objects. It is shown empirically that several combinations of easily-measured lines can be used to separate objects into one of four categories according to the principal excitation mechanism: normal H II regions, planetary nebulae, objects photoionized by a power-law continuum, and objects excited by shock-wave heating. A two-dimensional quantitative classification scheme is suggested.

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