Faint AGNs at z > 4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe

@article{Giallongo2015FaintAA,
  title={Faint AGNs at z > 4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe},
  author={Emanuele Giallongo and Andrea Grazian and Fabrizio Fiore and Adriano Fontana and Laura Pentericci and Eros Vanzella and Mark Dickinson and Dale D. Kocevski and Marco Castellano and Stefano Cristiani and Henry Ferguson and Steven L. Finkelstein and Norman A. Grogin and Nimish P. Hathi and Anton M. Koekemoer and Jeffrey A. Newman and Mara Salvato},
  journal={Astronomy and Astrophysics},
  year={2015},
  volume={578},
  pages={1-14}
}
Context. Establishing the number of faint active galactic nuclei (AGNs) at z = 4-6 is crucial to understanding their cosmological importance as main contributors to the reionization of the Universe. Aims. In order to derive the AGN contribution to the cosmological ionizing emissivity we have selected faint AGN candidates at z \textgreater 4 in the CANDELS GOODS-South field, which is one of the deepest fields with extensive multiwavelength coverage from Chandra, HST, Spitzer, and various ground… 

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