A FIRST-APM-SDSS survey for high-redshift radio QSOs

@article{Carballo2006AFS,
  title={A FIRST-APM-SDSS survey for high-redshift radio QSOs},
  author={Ruth Carballo and J. I. Gonzalez-serrano and Francisco Montenegro-Montes and Chris R. Benn and K. H. Mack and Marco Pedani and M. Vigotti},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2006},
  volume={370},
  pages={1034-1045}
}
We selected from the VLA FIRST survey a sample of 94 objects with star-like counterparts in the Sloan Digital Sky Survey (SDSS), and with APM POSS-I colour O − E 2, i.e. consistent with their being high-redshift quasars. 78 of the 94 candidates can be classified spectroscopically on the basis of either published data (mainly SDSS) or the observations presented here. The fractions of QSOs (51 out of 78) and redshift z > 3 QSOs (23 out of 78, 29 per cent) are comparable to those found in other… 
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This work has been funded by the Spanish Ministerio de Ciencia e Innovacion (MICINN) under project AYA2011-29517-C03-02.