%0 Generic %1 polsterer2012finding %A Polsterer, Kai Lars %A Zinn, Peter-Christian %A Gieseke, Fabian %D 2012 %K high-z photometry quasars selection %R 10.1093/mnras/sts017 %T Finding New High-Redshift Quasars by Asking the Neighbours %U http://arxiv.org/abs/1210.7071 %X Quasars with a high redshift (z) are important to understand the evolution processes of galaxies in the early universe. However only a few of these distant objects are known to this date. The costs of building and operating a 10-metre class telescope limit the number of facilities and, thus, the available observation time. Therefore an efficient selection of candidates is mandatory. This paper presents a new approach to select quasar candidates with high redshift (z>4.8) based on photometric catalogues. We have chosen to use the z>4.8 limit for our approach because the dominant Lyman alpha emission line of a quasar can only be found in the Sloan i and z-band filters. As part of the candidate selection approach, a photometric redshift estimator is presented, too. Three of the 120,000 generated candidates have been spectroscopically analysed in follow-up observations and a new z=5.0 quasar was found. This result is consistent with the estimated detection ratio of about 50 per cent and we expect 60,000 high-redshift quasars to be part of our candidate sample. The created candidates are available for download at MNRAS or at http://www.astro.rub.de/polsterer/quasar-candidates.csv.

@misc{polsterer2012finding, abstract = {Quasars with a high redshift (z) are important to understand the evolution processes of galaxies in the early universe. However only a few of these distant objects are known to this date. The costs of building and operating a 10-metre class telescope limit the number of facilities and, thus, the available observation time. Therefore an efficient selection of candidates is mandatory. This paper presents a new approach to select quasar candidates with high redshift (z>4.8) based on photometric catalogues. We have chosen to use the z>4.8 limit for our approach because the dominant Lyman alpha emission line of a quasar can only be found in the Sloan i and z-band filters. As part of the candidate selection approach, a photometric redshift estimator is presented, too. Three of the 120,000 generated candidates have been spectroscopically analysed in follow-up observations and a new z=5.0 quasar was found. This result is consistent with the estimated detection ratio of about 50 per cent and we expect 60,000 high-redshift quasars to be part of our candidate sample. The created candidates are available for download at MNRAS or at http://www.astro.rub.de/polsterer/quasar-candidates.csv.}, added-at = {2012-10-29T15:27:13.000+0100}, author = {Polsterer, Kai Lars and Zinn, Peter-Christian and Gieseke, Fabian}, biburl = {https://www.bibsonomy.org/bibtex/261f721d234adb1181f160b8850771c70/miki}, description = {[1210.7071] Finding New High-Redshift Quasars by Asking the Neighbours}, doi = {10.1093/mnras/sts017}, interhash = {a981c8c5a864e877331958fdbd6b5b7c}, intrahash = {61f721d234adb1181f160b8850771c70}, keywords = {high-z photometry quasars selection}, note = {cite arxiv:1210.7071Comment: 10 pages, 9 figures, accepted (MNRAS)}, timestamp = {2012-10-29T15:27:13.000+0100}, title = {Finding New High-Redshift Quasars by Asking the Neighbours}, url = {http://arxiv.org/abs/1210.7071}, year = 2012 }