Host Galaxies of z~4.7 Quasars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxies: Active, Galaxies: Evolution, Galaxies: Quasars: General

Scientific paper

Two micron broad- and narrowband imaging with the Gemini North Telescope of five z~4.7 QSOs has resolved both the host galaxies and [O II] emission-line gas. The resolved fluxes of the host galaxies fall within the extrapolated spread of the K-z relationship for radio galaxies at lower redshifts, and their resolved morphology is irregular. The [O II] images indicate knots coincident with many continuum features and also some bright jetlike features near the nucleus. The line emission total fluxes indicate overall equivalent widths of 5-10 Å at rest wavelengths. Two of the QSOs are in a local environment of faint galaxies of similar magnitude to the hosts, and three have nearby galaxies with excess narrowband flux, which would be [O II] if they are at the QSO redshift.
Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).

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