Romer, Kathy, The DES Collaboration, et al and D'Andrea, C. (2015) DES J0454-4448: discovery of the first luminous z >= 6 quasar from the Dark Energy Survey. Monthly Notices Of The Royal Astronomical Society, 454. pp. 3952-3961. ISSN 0035-8711
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Abstract
We present the first results of a survey for high-redshift, z >= 6, quasars using izY multicolour photometric observations from the Dark Energy Survey (DES). Here we report the discovery and spectroscopic confirmation of the zAB, YAB = 20.2, 20.2 (M1450 = -26.5) quasar DES J0454-4448 with a redshift of z = 6.09±0.02 based on the onset of the Ly alpha forest and an H I near zone size of 4.1_{-1.2}^{+1.1} proper Mpc. The quasar was selected as an i-band drop out with i-z = 2.46 and zAB < 21.5 from an area of ˜300 deg2. It is the brightest of our 43 candidates and was identified for spectroscopic follow-up solely based on the DES i-z and z-Y colours. The quasar is detected by WISE and has W1AB = 19.68. The discovery of one spectroscopically confirmed quasar with 5.7 < z < 6.5 and zAB <= 20.2 is consistent with recent determinations of the luminosity function at z ˜ 6. DES when completed will have imaged ˜5000 deg2 to YAB = 23.0 (5sigma point source) and we expect to discover 50-100 new quasars with z > 6 including 3-10 with z > 7 dramatically increasing the numbers of quasars currently known that are suitable for detailed studies.
Item Type: | Article |
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Keywords: | Galaxies: active, Galaxies: formation, Galaxies: high-redshift, Quasars: individual: DES J0454-4448, Dark ages, Reionization, First stars |
Schools and Departments: | School of Mathematical and Physical Sciences > Physics and Astronomy |
Subjects: | Q Science > QB Astronomy |
Depositing User: | Richard Chambers |
Date Deposited: | 27 Jun 2016 11:43 |
Last Modified: | 16 Apr 2017 22:55 |
URI: | http://srodev.sussex.ac.uk/id/eprint/61733 |
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📧 Request an updateProject Name | Sussex Project Number | Funder | Funder Ref |
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Astrophysics and Cosmology - Sussex Consolidated Grant | G1291 | STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL | ST/L000652/1 |