The NV/CIV ratio in high redshift radio galaxies
Fosbury, R. A. E. · Vernet, J. · Villar-Martin, M. · Cohen, M. H. · Cimatti, A. · Alighieri, S. di Serego
Original · EN
Deep Keck spectropolarimetry has been obtained of a sample of powerful radio galaxies with z 2.5 ± 1. In addition to a clear 2200Ådust scattering/extinction signature and an inverse correlation between the degree of continuum polarization and the Lyman-αemission line strength (relative to C IV), we find an intriguing positive correlation between the N V/C IV ratio and the polarization. The line ratio, which varies by almost a dex amongst objects having a very similar ionization state, is most likely to indicate an abundance ratio. We speculate that the correlation with polarization represents a connection between nitrogen enhancement and dust production following a major starburst event connected with the birth of the quasar.
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