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DESJ0454-4448: discovery of the first luminous z > 6 quasar from the Dark Energy Survey

DESJ0454-4448: discovery of the first luminous z > 6 quasar from the Dark Energy Survey
DESJ0454-4448: discovery of the first luminous z > 6 quasar from the Dark Energy Survey
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 Lyman-α forest and an HI near zone size of 4.1+1.1−1.2 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 (5σ 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.
0035-8711
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Banerji, M.
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Abbott, T.
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Wechsler, R.H.
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Reed, S.L., Mcmahon, R.G., Banerji, M., Becker, G.D., Gonzalez-Solares, E., Martini, P., Ostrovski, F., Rauch, M., Abbott, T., Abdalla, F.B., Allam, S., Benoit-Levy, A., Bertin, E., Buckley-Geer, E., Burke, D., Carnero Rosell, A., Da Costa, L.N., D'Andrea, C., Depoy, D.L., Desai, S., Diehl, H.T., Doel, P., Cunha, C.E., Estrada, J., Evrard, A.E., Fausti Neto, A., Finley, D.A., Fosalba, P., Frieman, J., Gruen, D., Honscheid, K., James, D., Kent, S., Kuehn, K., Kuropatkin, N., Lahav, O., Maia, M.A.G., Makler, M., Marshall, J., Merritt, K., Miquel, R., Mohr, J., Nord, B., Ogando, R., Plazas, A., Romer, K., Roodman, A., Rykoff, E., Sako, M., Sanchez, E., Santiago, B., Schubnell, M., Sevilla, I., Smith, C., Soares-Santos, M., Suchyta, E., Swanson, M.E.C., Tarle, G., Thomas, D., Tucker, D., Walker, A. and Wechsler, R.H. (2015) DESJ0454-4448: discovery of the first luminous z > 6 quasar from the Dark Energy Survey. Monthly Notices of the Royal Astronomical Society, 454 (4), 3952-3961. (doi:10.1093/mnras/stv2031).

Record type: Article

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 Lyman-α forest and an HI near zone size of 4.1+1.1−1.2 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 (5σ 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.

Text
DES J0454-4448 Discovery of the First Luminous z 6 Quasar from the Dark Energy Survey - Accepted Manuscript
Available under License Creative Commons Attribution.
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Accepted/In Press date: 1 September 2015
Published date: 27 October 2015
Additional Information: arxiv is am

Identifiers

Local EPrints ID: 443897
URI: http://eprints.soton.ac.uk/id/eprint/443897
ISSN: 0035-8711
PURE UUID: 3b9a83f0-09dd-44c5-b5d0-04016e0b8310

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Date deposited: 16 Sep 2020 16:34
Last modified: 25 Nov 2021 17:43

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Contributors

Author: S.L. Reed
Author: R.G. Mcmahon
Author: M. Banerji
Author: G.D. Becker
Author: E. Gonzalez-Solares
Author: P. Martini
Author: F. Ostrovski
Author: M. Rauch
Author: T. Abbott
Author: F.B. Abdalla
Author: S. Allam
Author: A. Benoit-Levy
Author: E. Bertin
Author: E. Buckley-Geer
Author: D. Burke
Author: A. Carnero Rosell
Author: L.N. Da Costa
Author: C. D'Andrea
Author: D.L. Depoy
Author: S. Desai
Author: H.T. Diehl
Author: P. Doel
Author: C.E. Cunha
Author: J. Estrada
Author: A.E. Evrard
Author: A. Fausti Neto
Author: D.A. Finley
Author: P. Fosalba
Author: J. Frieman
Author: D. Gruen
Author: K. Honscheid
Author: D. James
Author: S. Kent
Author: K. Kuehn
Author: N. Kuropatkin
Author: O. Lahav
Author: M.A.G. Maia
Author: M. Makler
Author: J. Marshall
Author: K. Merritt
Author: R. Miquel
Author: J. Mohr
Author: B. Nord
Author: R. Ogando
Author: A. Plazas
Author: K. Romer
Author: A. Roodman
Author: E. Rykoff
Author: M. Sako
Author: E. Sanchez
Author: B. Santiago
Author: M. Schubnell
Author: I. Sevilla
Author: C. Smith
Author: M. Soares-Santos
Author: E. Suchyta
Author: M.E.C. Swanson
Author: G. Tarle
Author: D. Thomas
Author: D. Tucker
Author: A. Walker
Author: R.H. Wechsler

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