Excitation and temperature of extended gas in active galaxies. I. Observations.

Details Excitation and temperature of extended gas in active galaxies. I. Observations. Excitation and temperature of extended gas in active galaxies. I. Observations.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..357s&link_type=abstract

Astronomy and Astrophysics, v.312, p.357-364

Astronomy and Astrophysics

Astrophysics

32

Galaxies: Active, Galaxies: Ism, Galaxies: Nuclei, Galaxies: Seyfert

Scientific paper

We have obtained long-slit spectroscopy of five active galaxies showing extended high excitation emission lines reaching distances of several kiloparsecs from the nuclei. Measurement of the fluxes of weak lines, such as [OIII]λ4363 and HeIIλ4686, requires careful subtraction of the contribution of the stellar population, and the procedure for this subtraction is discussed in detail. For each galaxy, we present emission-line ratios for the nucleus and the extended gas at the most distant locations for which the fluxes of the weaker high excitation lines can be measured with an uncertainty <=30%. In a companion paper (Paper II), these line ratios are used in a reevaluation of photoionization models of extended gas in active galaxies.

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