NICMOS Imaging of High-Redshift Radio Galaxies

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dc.creatorZirm, A.
dc.creatorDey, A.
dc.creatorDickinson, M.
dc.creatorMcCarthy, P. J.
dc.creatorEisenhardt, P.
dc.creatorDjorgovski, S. G.
dc.creatorSpinrad, H.
dc.creatorStanford, S. A.
dc.creatorvan Breugel, W.
dc.date1999-09-13
dc.date.accessioned2026-07-07T02:33:14Z
dc.date.available2026-07-07T02:33:14Z
dc.descriptionWe have obtained near-infrared (1.6 micron) images of 11 powerful 3CR radio galaxies at redshifts 0.8 < z < 1.8 using NICMOS on board HST. The high angular resolution permits a detailed study of galaxy morphology in these systems at rest-frame optical wavelengths, where starlight dominates over the extended, aligned UV continuum. The NICMOS morphologies are mostly symmetric and are consistent with dynamically relaxed, elliptical host galaxies dominated by a red, mature stellar population. The aligned structures are sometimes faintly visible, and nuclear point sources may be present in a few cases which manifest the ``unveiled'' AGN that is obscured from view at optical wavelengths. Our observations are consistent with the hypothesis that the host galaxies of z ~ 1-2 radio galaxies are similar to modern-day gE galaxies. Their sizes are typical of gE galaxies but smaller than present-day cD and brightest cluster galaxies, and their surface brightnesses are higher, as expected given simple luminosity evolution.
dc.description4 pages, 2 figures; to appear in the proceedings of "The Hy-Redshift Universe: Galaxy Formation and Evolution at High Redshift", held in Berkeley, June 21-24, 1999
dc.identifierhttps://arxiv.org/abs/astro-ph/9909210
dc.identifierhttp://arxiv.org/abs/astro-ph/9909210
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14764
dc.subjectAstrophysics
dc.titleNICMOS Imaging of High-Redshift Radio Galaxies
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