Journal
ASTROPHYSICAL JOURNAL
Volume 563, Issue 1, Pages 63-70Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/323833
Keywords
galaxies : active; galaxies : high-redshift; galaxies : individual (4C 40.36, 4C 48.48); infrared : galaxies
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We report on the rest-frame optical-line emission from the extended gas in two high-redshift radio galaxies, 4C 48.48 at z = 2.343 and 4C 40.36 at z = 2.265. These are among the first observations to obtain rest-frame optical spectra for distinct knots of gas within a high-redshift radio galaxy. Although the dominant ionization mechanism in both sources is photoionization by the central AGNs, we find evidence of another mechanism within the off-nuclear emission of each source. We measure [O II], [Ne III] and [O III] for several regions in 4C 48.48; these measurements indicate shock ionization in one region. We measure seven lines in 4C 40.36 and compare the on- and off-nuclear emission from the two strongest, H alpha and [O III]; we find that [O III]/H alpha is at least a factor of 4 weaker off-nucleus, suggesting star formation in the extended region.
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