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The Nature of the Compact/Symmetric Near-IR Continuum Source in 4C 40.36

By E. Egami, L. Armus, G. Neugebauer, B. T. Soifer, A. S. Evans and T. W. Murphy


Abstract. Using NICMOS on HST, we have imaged the emission-line nebulae and the line-free continuum in 4C 40.36, a ultra-steep spectrum FR II radio galaxy at z = 2.269. The line-free continuum was found to be extremely compact and symmetric while the emission-line nebulae seen in Hα+[N II] show very clumpy structures spreading almost linearly over 16 kpc. However, this linear structure is clearly misaligned from the radio axis. The SED of the line-free continuum is very flat (fν ∝ ν −0.5), suggesting that if the continuum emission is produced by a single source, it is likely to be a young bursting stellar population or scattered AGN light. However, because of the lack of a line-free optical image with a comparable spatial resolution, we cannot exclude the possibility that the observed SED is a composite of a young blue population and an old red population. 1

Year: 1999
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