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Spectroscopy of extremely distant radio galaxies

Spinrad, Hyron and Djorgovski, S. (1984) Spectroscopy of extremely distant radio galaxies. Astrophysical Journal, 285 . L49-L52. ISSN 0004-637X. doi:10.1086/184363.

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In this Letter we report the firm identification of two faint radio galaxies, 3C 13 and 3C 256, and a spectroscopic survey of 13 faint 3CR galaxies. The emission-line redshifts now extend up to z = 1.82 (3C 256), and we here present a list and a preliminary spectrum summary of the character of 11 new radio galaxies with z > 0. 77. About half of these luminous galaxies show low ionization emission-line spectra. Their strong [O II] lines can have luminosities up to 9 x 10^(43) ergs s^(-1) ; the emitted UV spectra have a much "softer" ionizing radiation field than those of QSOs and Seyfert nuclei. The spectra are of the narrow-line variety, with FWHM ≤ 1000 km s^(-1). The strong [O II] emission is often much extended and inclined, showing a considerable velocity amplitude. The most extreme cases are 3C 324 and 3C 267 (both with z > 1.0), but the phenomenon is moderately frequent. These are the most distant (non-QSO) galaxies known, and we can now extend the cosmological and galaxy evolution tests into previously unprobed territory.

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Djorgovski, S.0000-0002-0603-3087
Additional Information:© 1984 The American Astronomical Society. Received 1984 June 7; accepted 1984 July 12. We are very thankful to the staff of the KPNO for the valuable help in our observations, and in particular to J. De Veny, W. Ditsler, J. Barnes, S. Hammond, and G. Will. We also thank our colleagues M. Lebofsky, R. Laing, J. Kristian, and especially S. Lilly, for communication of positions and encouragement. Some of the data reductions were performed by J. Marr, and some of the software written by P. Monger. This work was partly supported by NSF grant AST81-16125 to H. Spinrad and a University of California Graduate fellowship to S. Djorgovski.
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NSFAST 81-16125
University of California, BerkeleyUNSPECIFIED
Subject Keywords:radio sources: galaxies - radio sources: spectra
Record Number:CaltechAUTHORS:20190731-075239616
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97541
Deposited By: Tony Diaz
Deposited On:31 Jul 2019 15:26
Last Modified:16 Nov 2021 17:32

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