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NICMOS Imaging of High-Redshift Radio Galaxies | | A. Zirm
; A. Dey
; M. Dickinson
; P.J. McCarthy
; P. Eisenhardt
; S.G. Djorgovski
; H. Spinrad
; S.A. Stanford
; W. van Breugel
; | | Date: |
13 Sep 1999 | | Subject: | astro-ph | | Affiliation: | JHU),A. Dey (NOAO), M. Dickinson (STScI), P.J. McCarthy (OCIW), P. Eisenhardt (JPL/Caltech), S.G. Djorgovski (Caltech), H. Spinrad (UCB), S.A. Stanford and W. van Breugel (IGPP/LLNL | | Abstract: | We 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. | | Source: | arXiv, astro-ph/9909210 | | Services: | Forum | Review | PDF | Favorites | |
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