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http://hdl.handle.net/20.500.12386/26181
Title: | First discoveries of z ̃ 6 quasars with the Kilo-Degree Survey and VISTA Kilo-Degree Infrared Galaxy survey | Authors: | Venemans, B. P. Verdoes Kleijn, G. A. Mwebaze, J. Valentijn, E. A. Bañados, E. DECARLI, ROBERTO de Jong, J. T. A. Findlay, J. R. Kuijken, K. H. LA BARBERA, Francesco McFarland, J. P. McMahon, R. G. NAPOLITANO, NICOLA ROSARIO Sikkema, G. Sutherland, W. J. |
Issue Date: | 2015 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 453 | Issue: | 3 | First Page: | 2259 | Abstract: | We present the results of our first year of quasar search in the ongoing ESO public Kilo-Degree Survey (KiDS) and VISTA Kilo-Degree Infrared Galaxy (VIKING) surveys. These surveys are among the deeper wide-field surveys that can be used to uncover large numbers of z ̃ 6 quasars. This allows us to probe a more common population of z ̃ 6 quasars that is fainter than the well-studied quasars from the main Sloan Digital Sky Survey. From this first set of combined survey catalogues covering ̃250 deg<SUP>2</SUP> we selected point sources down to Z<SUB>AB</SUB> = 22 that had a very red i - Z (i - Z > 2.2) colour. After follow-up imaging and spectroscopy, we discovered four new quasars in the redshift range 5.8 < z < 6.0. The absolute magnitudes at a rest-frame wavelength of 1450 Å are between -26.6 < M<SUB>1450</SUB> < -24.4, confirming that we can find quasars fainter than M*, which at z = 6 has been estimated to be between M* = -25.1 and M* = -27.6. The discovery of four quasars in 250 deg<SUP>2</SUP> of survey data is consistent with predictions based on the z ̃ 6 quasar luminosity function. We discuss various ways to push the candidate selection to fainter magnitudes and we expect to find about 30 new quasars down to an absolute magnitude of M<SUB>1450</SUB> = -24. Studying this homogeneously selected faint quasar population will be important to gain insight into the onset of the co-evolution of the black holes and their stellar hosts. | URI: | http://hdl.handle.net/20.500.12386/26181 | URL: | https://academic.oup.com/mnras/article/453/3/2259/1079051 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv1774 | Bibcode ADS: | 2015MNRAS.453.2259V | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stv1774.pdf | Pdf editoriale | 666.76 kB | Adobe PDF | View/Open |
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