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Glikman, E; Djorgovski, S G; Stern, D; Bogosavljevic, M; Mahabal, A
The Astrophysical journal, 07/2007, Letnik: 663, Številka: 2Journal Article
We report the discovery of two low-luminosity quasars at z similar to 4, both of which show prominent N IV lambda 1486 emission. This line is extremely rare in quasar spectra at any redshift; detecting it in two of a sample of 23 objects (i.e., similar to 9% of the sample) is intriguing and is likely due to the low-luminosity, high-redshift quasar sample we are studying. This is still a poorly explored regime, where contributions from associated, early starbursts may be significant. One Interpretation of this line posits photoionization by very massive young stars. Seeing N IV lambda 1486 emission in a high-redshift quasar may thus be understood in the context of coformation and early coevolution of galaxies and their supermassive black holes. Alternatively, we may be seeing a phenomenon related to the early evolution of quasar broad emission line regions. The nondetection (and possibly even broad absorption) of N v lambda 1240 line in the spectrum of one of these quasars may support that interpretation. These two objects may signal a new faint quasar population or an early AGN evolutionary stage at high redshifts.
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