A radio galaxy at z=3.6 in a giant rotating Lyman α halo
Abstract
We present the discovery and detailed observations of the radio galaxy 1243+036 (=4C 03.24) at a redshift of z=3.57. The most spectacular feature of 1243+036 is the presence of a Lyα halo of luminosity 1044.5 ergs s-1 which extends over20'' (135 kpc). The narrow band imaging and the high resolution spectroscopy show that the Lyα gas has three distinct components: (i) gas with a high velocity dispersion (1550 km s-1 FWHM) located inside the radio structure, (ii) enhanced Lyα emission blue shifted by 1100 km s-1 at the location of the strong bend in the radio jet and (iii) Lyα emission extending out well beyond the radio lobes. This emission has a low velocity dispersion (250 km s-1 FWHM) and a velocity gradient of 450 km s-1 over the extent of the emission, indicative of large scale rotation. On the basis of these obserserations various mechanisms for the origin and kinematics of the Lyα halo are discussed.
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