Giant low surface brightness halos in distant radio galaxies

Details Giant low surface brightness halos in distant radio galaxies Giant low surface brightness halos in distant radio galaxies

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..17..260v&link_type=abstract

Galaxy Evolution: Theory & Observations (Eds. Vladimir Avila-Reese, Claudio Firmani, Carlos S. Frenk & Christine Allen) Revista

Astronomy and Astrophysics

Astronomy

Cosmology: Early Universe, Galaxies: Active, Galaxies: Formation, Galaxies: Individual: Uss 0828+193

Scientific paper

We present results on the spectroscopic study of the extended ionized gas in the distant radio galaxy USS0828+193 at z =2.57. The kinematic analysis of the Keck II spectra reveals the existence of a giant ( ~ 80 kpc) low surface brightness halo of quiescent kinematics consistent with gravitational motions. The halo is enriched with heavy elements and is ionized by the continuum from the active nucleus. We find similar halos in most objects in our sample of 11 high redshift (z ~ 2.5) radio galaxies. They might be a common ingredient of this type of objects. We discuss briefly the nature and the origin of these halos.

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