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Keck observations of the most distant galaxy: 8C 1435+63 at Z = 4.25
Spinrad, Hyron; Dey, Arjun; Graham, James R.
AA(University of California, Berkeley, CA, US), AB(University of California, Berkeley, CA, US), AC(University of California, Berkeley, CA, US)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 438, no. 2, p. L51-L54 (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Active Galaxies, Compton Effect, Continuum Mechanics, Cosmology, Lyman Alpha Radiation, Radio Astronomy, Radio Spectra, Red Shift, Extremely High Frequencies, Galactic Evolution, Imaging Spectrometers, Space Observations (From Earth), Spectrum Analysis, Ultraviolet Spectra
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We report on Keck observations and confirm the redshift of the most distant galaxy known: 8C 1435+63 at z = 4.25. The spectrum shows a strong Ly alpha line, a Ly alpha forest continuum break and a continuum break at lambdarest = 912 A. The ly alpha emission is spatially extended and roughly aligned with the radio source. The galaxy shows a double structure in the I-band (lambdarest approximately equals 1500 A) which is aligned with the radio axis; the two I-band components spatially coincide with the nuclear and southern radio components. Some fraction of the I-band emission could be due to a nonthermal process such as inverse Compton scattering. In the K-band (lambdarest approximately equals 4200 A), which may be dominated by starlight, the galaxy has a very low surface brightness, diffuse morphology. The K morphology shows little relationship to the radio source structure, although the major axis of the K emission is elongated roughly in the direction of the radio source axis. The galaxian continuum is very red (I - K greater than 4) and if the K continuum is due to starlight, implies a formation redshift of zf greater than 5. We speculate that this galaxy may be the progenitor of a present-day cD galaxy.

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