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

Egami, E. and Armus, L. and Neugebauer, G. and Soifer, B. T. and Evans, A. S. and Murphy, T. W., Jr. (1999) The Nature of the Compact/Symmetric Near-IR Continuum Source in 4C 40.36. In: The Hy-Redshift Universe: Galaxy Formation and Evolution at High Redshift. Astronomical Society of the Pacific Conference Series. No.193. Astronomical Society of the Pacific , San Francisco, CA, pp. 86-89. ISBN 1-58381-019-6.

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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 Hɑ+[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 (ƒv ∝ v^(-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.

Item Type:Book Section
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URLURL TypeDescription Paper
Armus, L.0000-0003-3498-2973
Evans, A. S.0000-0003-2638-1334
Additional Information:© 1999 Astronomical Society of the Pacific.
Group:Infrared Processing and Analysis Center (IPAC)
Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:193
Record Number:CaltechAUTHORS:20170221-111014799
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74423
Deposited By: Ruth Sustaita
Deposited On:21 Feb 2017 19:41
Last Modified:02 Jun 2023 01:32

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