NTT archives: the Lyman α profile of the radio galaxy 1243+036 revisited.

Details NTT archives: the Lyman α profile of the radio galaxy 1243+036 revisited. NTT archives: the Lyman α profile of the radio galaxy 1243+036 revisited.

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998msngr..92...37b&link_type=abstract

The Messenger, vol. 92, p. 37-39

Astronomy and Astrophysics

Astrophysics

2

Radio Galaxies: Lyman Alpha

Scientific paper

All observations of very high redshift radio galaxies attest to a highly complex interaction between large-scale astrophysical processes as violent and diverse as that of nuclear activity and of cosmogonic star formation. Lya is seen in emission over scales exceeding galactic sizes and its resonant nature leads by itself to a wide range of phenomena such as absorption lines due to intervening H I gas layers of very small columns, or enhanced dust extinction due to the manifold increase in path length traversed before escape. The resonant nature of Ly alpha can also manifest itself in emission through the process of Fermi acceleration across a shock discontinuity which leads to a large blueshift of the line photons. We propose that such a process is at work in the radio galaxy 1243+036 (z = 3.6) and can account for the three narrow emission peaks present on the blue side of the profile. The ultimate source of the photons present in those peaks likely consists of a jet-induced starburst of >= 5 10^7 M0 situated at the position of the radio jet bend. Our investigations illustrate one possible use of the user friendly archival database developed by ESO.

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