Keck Observations of the Most Distant Galaxy: 8C1435+63 at z=4.25

Details Keck Observations of the Most Distant Galaxy: 8C1435+63 at z=4.25 Keck Observations of the Most Distant Galaxy: 8C1435+63 at z=4.25

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18510705s&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #107.05; Bulletin of the American Astronomical Society, Vol. 26, p.1497

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observations made at the W. M. Keck Observatory of the z=4.25 radio galaxy 8C1435+63. The spectrum shows a strong Lyalpha line, a Lyalpha forest continuum break and a continuum break at lambda_ {rest}=912 Angstroms. The Lyalpha emission is spatially extended and roughly aligned with the radio source. The galaxy shows a double structure in the I-band (lambda_ {rest} ~1500 Angstroms) 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 (lambda_ {rest} ~4200 Angstroms), 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>4) and, if the K continuum is due to starlight, implies a formation redshift of z_f > 5. We speculate that this galaxy may be the progenitor of a present day cD galaxy. As the most distant galaxy known, the age of the stellar population of 8C1435+63 may place strong constraints on the epoch of galaxy formation.

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