10-1093-MNRAS-STV20131.pdf (4.5 MB)
DES J0454-4448: discovery of the first luminous z >= 6 quasar from the Dark Energy Survey
journal contribution
posted on 2023-06-09, 01:54 authored by Kathy RomerKathy Romer, et al The DES Collaboration, C. D'AndreaWe 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.
Funding
Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1
History
Publication status
- Published
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- Published version
Journal
Monthly Notices Of The Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Volume
454Page range
3952-3961Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-06-27First Open Access (FOA) Date
2016-06-27First Compliant Deposit (FCD) Date
2016-06-27Usage metrics
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