HST Images of the Extremely Clumpy Radio Galaxy 1138-262 at Z =2.2

Details HST Images of the Extremely Clumpy Radio Galaxy 1138-262 at Z =2.2 HST Images of the Extremely Clumpy Radio Galaxy 1138-262 at Z =2.2

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...504..139p&link_type=abstract

Astrophysical Journal v.504, p.139

Astronomy and Astrophysics

Astronomy

35

Galaxies: Active, Galaxy: Formation, Galaxies: Structure, Galaxies: Individual Alphanumeric: 1138-262

Scientific paper

We present and discuss optical continuum images made with the Hubble Space Telescope of the radio galaxy 1138-262 at z = 2.2. This object possesses one of the clumpiest optical morphologies of all known high-redshift radio galaxies, consisting of a bright nucleus aligned along the radio axis and a number of smaller components distributed over a region as large as the radio source (130 kpc). The clumps have sizes ranging from 3 to 13 kpc and absolute visual magnitudes between MV = -21.8 and MV = -19.4. On the basis of HST and previous observations, we claim that these clumps are star-forming galaxies that will be accreted by the host galaxy of 1138-262. We compare this radio galaxy with other high-redshift objects and with the predictions of current scenarios of galaxy formation.

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