Near-Infrared Spectrophotometry of the Radio Galaxy 4C 40.36 at z=2.269

Details Near-Infrared Spectrophotometry of the Radio Galaxy 4C 40.36 at z=2.269 Near-Infrared Spectrophotometry of the Radio Galaxy 4C 40.36 at z=2.269

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466l..67i&link_type=abstract

Astrophysical Journal Letters v.466, p.L67

Astronomy and Astrophysics

Astronomy

6

Galaxies: Active, Galaxies: Individual Alphanumeric: 4C 40.36, Galaxies: Formation, Infrared: Galaxies

Scientific paper

We present new near-infrared spectrophotometric observations of the high-z radio galaxy 4C 40.36 (z = 2.269) including J- and H-band images and a low-resolution ( lambda / Delta lambda ~ 100) spectrum between 1.14 and 1.70 mu m. We have detected distinctively strong [O III] lambda 4959/5007 doublet and other relatively weak emission lines superposed on the faint flat continuum. The measured emission-line ratios are roughly consistent with the typical narrow-line AGN with the solar metal abundance, except for the large [Ne III] lambda 3869/[O II] lambda 3727 ratio that is probably caused by the overabundance of neon in this object. The J-band image attributable to stellar emission is aligned with the radio axis, while the H-band image mostly due to [O III] line emission (about 73%) is more symmetric, indicating a concentric distribution of strong oxygen line-emitting clouds. Based on these morphological features together with the extremely flat continuum over the UV-to-optical spectral region in the rest frame, we have examined two models, which are an extremely young galaxy model (age = 0.02--0.1 Gyr) as well as a scattered AGN model.

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