Near-IR Observations of Powerful High-Redshift Radio Galaxies: 4C 40.36 and 4C 39.37

Details Near-IR Observations of Powerful High-Redshift Radio Galaxies: 4C 40.36 and 4C 39.37 Near-IR Observations of Powerful High-Redshift Radio Galaxies: 4C 40.36 and 4C 39.37

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.7307e&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #73.07; Bulletin of the American Astronomical Society, Vol. 33, p.897

Astronomy and Astrophysics

Astronomy

Scientific paper

We present near-IR imaging and spectroscopic observations of two FR II high-redshift radio galaxies (HzRGs), 4C 40.36 (z=2.27) and 4C 39.37 (z=3.22), obtained with the Hubble, Keck, and Hale Telescopes. The HST/NICMOS images taken with the line-free filters show a compact and symmetric continuum source in both galaxies. Their surface brightness profiles can be fit equally well by either an R1/4- or exponential-law profile, indicating that these two types of profiles cannot easily be distinguished for z>2 HzRGs even with the HST/NICMOS images. If we adopt the R1/4-law fits, the half-light radii are only a few kpc, significantly smaller than those of z ~ 1 radio galaxies ( ~10 kpc). Spectroscopically, our Keck near-IR spectra show that 4C 40.36 has an extremely flat continuum spectrum (fν = const) while the spectrum of 4C 39.37 is as red as that of a gE galaxy. These results indicate that at z>2, we are seeing a substantial size/spectral evolution of the near-IR (i.e., restframe visual) continuum sources in HzRGs, despite which the K-z relation is somehow maintined.

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