Imaging of the field of 4C 41.17 below the Lyman limit

Details Imaging of the field of 4C 41.17 below the Lyman limit Imaging of the field of 4C 41.17 below the Lyman limit

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280..888l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 3, pp. 888-894.

Astronomy and Astrophysics

Astronomy

18

Galaxies: Active, Galaxies: Formation, Galaxies: Individual: 4C 41.17

Scientific paper

Imaging of z>=3.4 radio galaxy fields below the Lyman continuum wavelength allows companion galaxies to be identified on the basis of red colours across the wavelength of redshifted Lyalpha and very red colours across the redshifted Lyman continuum. These arise owing to a combination of absorption by intervening Lyalpha forest and Lyman-limit systems, and intrinsic Lyman-limit breaks in the galaxy spectral energy distribution caused by an HI screen or breaks in stellar spectra. As a pilot study we have imaged the field of the z=3.8 radio galaxy 4C 41.17 in U, V and R with the Auxiliary Port of the William Herschel Telescope (WHT). We find a number of potential companion galaxies, which require confirmation via spectroscopy or narrow-band imaging. The Lyman limit in the spectrum of the radio galaxy itself and its implications for the origin of the UV flux are also discussed.

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