NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T17:50:52 PDT
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For refcode 1996A&A...312..357S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1996A&A...312..357S Excitation and temperature of extended gas in active galaxies. I.Observations. Storchi-Bergmann T., Wilson A.S., Mulchaey J.S., Binette L. Received 6 November 1995 / Accepted 21 December 1995 Abstract. 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]{lambda}4363 and HeII{lambda}4686, 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. Keywords: galaxies: active - galaxies: ISM - galaxies: nuclei - galaxies: Seyfert
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